If you are looking for a single ply roofing membrane that will be energy efficient and are evaluating your options, consider installing a TPO roof.
TPO roofing is touted to have the benefits of two of its direct competitors EPDM and PVC roofs, but without the drawbacks and extra costs.
This means that a TPO roof is as UV-resistant and as heat-resistant as an EPDM rubber membrane, and as heat-weldable as PVC.
What Is A TPO Roof?
See costs in your area
Start Here - Enter Your Zip Code
The TPO membrane was first introduced to the roofing market in the early 1990’s as a more economical and efficient alternative that was thought to replace PVC roofing products.
TPO roofing material is a single ply roofing system that consisting of a thermoplastic polyolefin membrane. This membrane is composed of three layers:
1. TPO polymer base.
2. polyester-reinforced fabric center (scrim).
3. thermoplastic polyolefin compounded top ply.
Common fillers used in TPO manufacturing include but are not limited to: talc, fiberglass, carbon fiber, wollastonite, and Metal Oxy Sulfate. Popular rubbers used in TPO manufacturing include ethylene-propylene rubber and EPDM.
Benefits of TPO Roofing Roofing Material
Here are the top reasons why so many home and business owners choose to install TPO membranes on their flat roofs.
Economical
One of the factors that makes TPO roofing attractive both in residential and commercial construction is its reasonable cost.
TPO offers many of the same benefits as PVC roofing, such as hot-air weldable seams and energy efficiency, but at a lower cost.
Fits different home styles
Many homeowners appreciate the fact that TPO is manufactured to look great on many different types of homes. TPO is available in white, light grey and black reflective color options.
Now you do not need to get a white roof to enjoy the energy saving and reflective properties. Latest technologies enable all colors of TPO roofing membranes to be UV resistant and “cool”.
Durable
In comparison to other thermoplastic membranes, TPO resists mold growth, dirt accumulation, tears impact and punctures. It is made to be flexible and can allow for a home’s or building’s movement or settling.
Reinforced TPO membranes can handle a building’s thermal expansion and contraction more effectively than other single ply roofing products.
Ease of installation
In general TPO membranes are manufactured with wider sheets and are light weight. This means that the material is easier to install and there is less seams. Less work and time associated with the installation translates into direct savings for you for the cost of installation.
See costs in your area
Start Here - Enter Your Zip Code
Energy Efficient
The energy efficiency of TPO roofing membranes makes them highly attractive to home owners who want to have the benefits of savings on their cooling costs as well as help the environment by reducing the carbon footprint.
TPO’s membrane’s white reflective surface exceeds the EPA’s ENERGY STAR requirements and white, tan and gray are listed with the Cool Roof Rating Council.
This means that having a TPO roof on your home or building will keep the interior thermally comfortable on hot summer days while reducing your air conditioning costs.
Disadvantages Of TPO Roofs
The following are top downsides to consider before choosing to install a TPO membrane.
Questionable longevity
One of the biggest disadvantages of a TPO roof is that it is a really young roofing technology. It has been around only for about 30 years and manufactures are still trying to figure out the best chemical formula that will make the product durable and long lasting while maintaining a competitive price.
Finding this right formula has been a challenge for many manufacturers and over the years there have been many documented instances of seam failures and material failures such as membrane curing and cracking.
New and improved formulas continue to be tested, but it is not possible to tell at this point how long a new TPO roofing product will last.
If you choose to purchase a TPO roofing membrane, it is advisable to get it from a manufacturer that has been around since the beginning of TPO production, as they will most likely have the most long lasting formulation available on the market today.
Does not stand up well to heat load
TPO membranes have been noted to have an issue of accelerated weathering when subjected to high thermal or solar loading. This problem has been specifically documented in the Southern states that get a lot of heat and sun throughout the year.
The MRCA committee that issued the report based on their research, recommended the following to contractors:
“If situations exist that may commonly elevate temperatures over 160 degrees or increase solar loads beyond “normal” question the manufacturer as to the suitability of their product for the situation; consider changing the product to a material that will clearly withstand the loading.
Is Residential TPO Roofing Worth It?
As any roofing material, TPO also has its disadvantages and shortcomings that are primarily due to the fact that TPO is a fairly new roofing material on the market and research still continues to find the most durable and long lasting product formulation.
Before purchasing a TPO membrane for your home or commercial building, carefully consider all the pros and cons of TPO roofing.
We recommend that you read our overview of MRCA TPO Advisory which it has issued for commercial roofing contractors, and what it means for building owners.
See costs in your area
Start Here - Enter Your Zip Code
Hi folks – I am on an HOA board and am receiving conflicting information about a potential repair. This is a multi-family in California which about 16 units in one building. Our TPO roof was installed about 15 years ago.
One of the units is experiencing a bad leak after continuous (serious for us) rains over the past several months as well as two hail storms.
One vendor is suggested we remove a large (20 x 20) patch of existing TPO, replace any damaged plywood/insulation/etc. underneath then put in a new section of TPO and heat weld to the rest of the roof.
Another vendor says NOT to do TPO patch and instead use APP torch applied modified bitumen capsheet finished with two coats of GAF ACRYLIC COATED MEMBRANE.
Anyone have any thoughts advice? Appreciate it!!
HI everyone we have been installing EPDM for 31 years now, our first roof that we installed it 31 years ago and still looks great and just with the proper maintenance, we have replaced one 7 to and a 12 years old TPO roofs here in the chicagoland area with EPDM we are starting to see a lot of TPO failing around this area it seems that they cannot get the formula right so far.
Hi. Curious can you put gravel on top of TPO roof. I have a small flat over hang at my front door that TOO was installed. It’s grey TPO and doesn’t match the rest of my shingle roofing. It stands out like a sore thumb. Because you see it as you walk down the steps to the house you see this TPO. I don’t know what to do to make it more pleasing to the eye. Can you make an suggestion? I really don’t want to paint it. If some type of gravel could be put on top to match the existing shingles. Would that work? Thank you.
I agree with Leva. I’d try to call the local inspection office and ask them some question before investing in a walkway that might’ve been needed.
Roofer removed and replaced roof, down to the decking. He installed new 19/32″ OSB, then covered with thin liner (I think, not 100% sure what he used), then mechanically installed 0.060″ TPO, made by GAF. I have two concerns:
1. Was it installed to code (R-Value)? – I was fairly certain, they are required to install insulation under the TPO, they did not use any additional insulation.
2. I am a Commercial Estimator, so I have some experience with TPO, but I am not an expert. The workmanship looks terrible. After inspecting the completed job, 5 days after completion, we found several areas that were bubbling, lifting at seams, very jagged / crooked seams. I don’t want to verify workmanship, after it rains and I get leaks everywhere. What can I do to verify proper install? Does the roofer require to be TPO certified?
Hi!!!
I had TPO placed on slightly pitched flat roof approximately 7 months ago with the following now happening;
Bubbles along most of the outer edge mm away from the flashing
Pooling water
Cracks at the circular adhering brackets
Caulking peeling up
Leak with winter thaw,No active leak now
Roofing company states “ There is NO Issue”
Please advise!!!
Very informative article. You made a great point regarding the longevity of TPO roofing. I was planning to have one installed by Roof Master, but right now, I think I’ll reconsider sticking with metal roofs. Thanks for this!
2 questions: Historic St. Louis home, brick with clay coping tiles. Inside, we had leaks where wall meets ceiling in several places, and we were told this was because of penetrations in TPO due to incorrect solar install. 2nd TPO roof installed in 2021, no solar penetrations, leaks are worse! Roof was done by a reputable company. TPO was cut off at the edge of the parapet wall, sealed down to the top of the parapet with an adhesive which didn’t seem to stick for long, and then laid the historic clay coping tiles down on top, without sealing between them. Should the TPO have been adhered down side of the wall? If so, is there some way to better seal the parapet walls without a whole new roof? That’s all I’ve been offered.
Also, sealant where TPO edge meets brick on chimneys didn’t last a year. General contractor neighbor suggested I use Vulkem. Is that going to adhere to the TPO? If not, what’s the best sealant for brick/TPO joint? Thank you!
we have a TPO roof that is sweating and causing dripping when it hasn’t rained in months.
It is an open beam ceiling with tongue and grove. It has 4” ridged insulation and barely 1/2 above the insulation is the roof. Did the contractor install too thick of insulation causing it to sweat?
I would suggest using a two-way vent on the roof. This may help. You should use one vent for every 400 to 500 square feet
I live in Boise Idaho our IB roof has mold on the under side of the roof sheeting. Why and what caused this?
Todd,
Do you have any air vents installed on the roof? Is the roof fully adhered (glued down) or mechanically attached with screws?
On a mechanically attached single ply roof, you will always have condensation under membrane, and it is critical to remove it with roof vents. I believe IB Roofs recommends one 4″ cone vent for every 500 s.f., although I would use larger “mushroom” vents instead as they add better air circulation.
Hope this helps.
Your installer forgot to install a vapor barrier.
Yes single plys are well known for sweating, see it all the time. It is a plastic like product after all, save this product for commercial/ industrial applications. They can afford the odd ceiling tile replacements
If the deck does not have a vapor BARRIER then the humidity from the interior space will fine the dew point inside the insulation and condensate. Then “sweat” back into the house. If there were a vapor barrier, the vapors would not get to the dew point and no condensation would form.
Hello, I have a rooftop TPO roof, can you walk on a GAF TPO roof we have been told that you can’t. We bought this townhome with a roof top terrace.
Thanks Brian
You cannot walk on it from me warranty standpoint. However even if you had warranty claim most manufacturers never honor them.
Especially that your roof is residential, GAF would likely say that their product is not made for residential or the warranty doesn’t cover it even if you had a claim. MOST TPO ROOFS ARE NOT WARRANTED FOR RESIDENTIAL USE.
So I will just put some sort of fake plastic grass on it or get some special walk thread and line it on top of TPO and then you can walk on it. However you still got to be careful as not to puncture the roof.
Bottom line you should really find out what your warranty says, as far as the residential use, and make your decision based on that
Hello,
We are currently in an insurance claim for snow & ice damage to a TPO roof. Causation has been leaks into the interior rooms.
We are looking for precedent or definition of how to identify the link between the snow/ ice 8″ to the leaks.
Leaks only appeared AFTER the snow hit our area in Southern Missouri. Snow & Ice was on the roof for several days.
Any documentation or directing us to another good source such as yours would help.
Thank you,
can TPO be installed over synthetic underlayment or felt paper?
Dan,
Synthetic underlayment – yes.
Felt – NO!
Felt is asphalt based, and will damage TPO, if in contact, and void warranty.
Good luck.
TPO is flammable and should only be installed over a fire resistant substrate not a synthetic underlayment
Can I apply asphalt shingles over TPO, or PVC? If so what is the process? I have a 5/12 pitch coming down from the peak/ridge sloping down gradulaly to the last 8ft to edge of roof is about 2/12 pitch. I would like to do the whole roof with shingles but I know the last 8ft of roof will need some sort of membrane. I don’t like the look of 2/3 of the roof shingles and 1/3 membrane. Any ideas? Thanks
We r buying a new townhome with a roof deck made of tpo. We wanted to buy a small propane fire pit to put on roof with some patio furniture. Will that be okay ?
I would not recommend anything like that on a TPO roof, unless you have a wooden or composite deck on the roof. TPO roof will easily burn, unlike PVC:
Good luck
Anything will burn in winds like that, it’s all roofing ‘petroleum’ products after all
Tpo is highly flammable and should be removed and replaced ASAP see link https://youtu.be/VjtHyKxM9ZU
I have a tpo roof over a garage extension, been very happy with it for 10 years now (it is currently 2020) except that is it extremely slippery when wet. We use this area as a small porch off a bedroom, and keep a mat down because it is so slippery. Is there anything i can paint the TPO with to give it more grip?
Thomas – I would strongly recommend NOT to paint! Because if you have a leak, paint will make the roof impossible to repair!
You can buy something like fake grass like this (notice it does not have any sharp edges), or rubber mats for kitchen to put on top of TPO.
You should not walk directly over roof, unless there for service / maintenance. Regular TPO is not made for foot traffic.
Good luck.
How would the fake grass be attached to the TPO roof to meet required wind loads in an area and has the attachment method been approved by an independent agency?
TPO is UV-resistant and its white color helps too. With TPO, your RV stays cooler as white color reflects heat and allows the RV to cool down faster. You can also experiment with your roof color with TPO since it is available in almost all shades. Is that right?
can you tell me if we have a concern with our roof install. our TPO roof was removed down to the pan roof. They left the edges on and covered over with the new TPO. We have add ons to the main so they exended the TPO out about a foot over to the metal roof and fastened it down. The insulation should of been doublesided foiled, but it was only 1 sided and the foil side was layed down. I told this to the guy the workers report to and he said that would not of been used, that they dont use 1 sided foil insulation and an inspector would have the roof redone if that was the case. I am 100% positive it was one sided and the foil side was placed down. Should we be concerned, thank you
We recently added a new roof over the front entrance to our residential home at the same time we were having our shingles replaced. The contractor installed tpo as he indicated it was the best option due the roof being flat (1:2.5). The color placed was light gray and the color of the shingles are dark gray. We are unhappy with the large contrast of color as it is very noticeable. Is there anything we glue on top of tpo, such as shingles or rolled roofing, to make it look more consistent with the rest of our roof? I am even willing to spray paint it that’s an option!
Does anyone know how old this post is? Reason for my asking is because TPO has been around much longer than 10 years. In reality, TPO first came into being some time around 1986. I know for a fact that TPO existed in the 90s so 10-years is way off base. As I seem to be seeing date omissions quite a lot, those who post articles online really need to start including a date to show when the post was written to prevent those reading it from using/passing dated information that may no longer be valid.
This post is about 8 years old… however, TPO is still not so good compared to PVC.
I was welding some newer samples of TPO and PVC couple of month ago … TPO welds just coming apart so easy.
I’m planning to do a big welding review video of TPO and PVC from multiple manufacturers. Stay tuned.
The current formulation for TPO is only about 12 years old
You cannot compare it to any older version
I installed first TPO roof in north America in 1986
Just curious since my company produced the first TPO roofing material.
Whose product did you install?
Thanks
We live in California, a lot of rain in the winter. We have a small leak in the low slope roof, but not flat. A roofer recommended a TPO and it will be installed over the existing shingles one. Is it a good idea? or we have to remove the shingles roof before install the TPO one. Also, since TPO is not waterproof, is it ok to cover on the top like that to avoid the leaks? and how long TPO does it last?
Ken,
1) I recommend you remove the shingles and repair any wood rot.
2) TPO is waterproof 🙂 …
3) TPO can last 5-25’ish years. No one knows, because manufacturers change formulations too often and it’s very hard to track. Also depends who the manufacturer is.
If you are concerned about longevity, go with quality PVC roof.
Good luck
Can TPO be used under cement tile as a water barrier on a low pitch 2:12 cover? Is this a typical configuration and will this be a configuration that would be a robust solution to wind driven rain? What are the concerns or considerations.
Hi Stephen,
Yes it can be used. I strongly recommend using 80-mil TPO or PVC material for this application.
Also it will most likely be not under warranty, as primary application for these products is roofing.
Good luck
I do not agree with that comment Unless you adhere the tile to the TPO which is adhered to the substrate
If you nail the tile through the TPO it is no longer watertight
I have a low pitch cover (2:12) I would like to put over our back deck. Our contractor is recommending a seamless metal roof. Our HOA wants us to use cement tile. Tile even with double underlayment application is not recommended for this shallow of a pitch. The HOA is suggesting we use TPO and then build the cement tile on top. We are exposed to high wind and rain in the winter and have had problem with water damage. I can’t find any examples of TPO under cement tile on a low pitch roof. Base on my research I am concerned about the rated life of TPO and since it is above an outdoor kitchen the potential fire risk. What construction technique would make the most sense?
Stephen, I already replied to your other question, and then read this comment. So if there is a kitchen, you should use PVC instead of TPO, as PVC is not combustible.
However, since you plan to put cement tiles on top, my concern becomes this – the cement will not bond to either PVC or TPO and the whole slab will just slide off eventually …
There is an option of going with METAL tile that resembles concrete/clay tile. But that is also not designed for 2:12 pitch, and TPO or PVC will not be of any help once you put multiple holes in it.
So if you can solve the issue of tile/cement slab sliding off, and the wight issues, you can use PVC.
How big is the roof? What you could do if roof is fairly small, is build two “walls” like 2-3″ high on each side of the roof. Install TPO/PVC on the roof, and up & over these “walls”. Attach battens (PT 2×4″ laying flat) to these “walls” on the side, without penetrating the roof. Then you can use stone coated metal tiles.
Not sure if this would be approved by building department, but I think structurally it will work and prevent wind blow-offs. The key is that your roof is not too big, so batten span does not exceed 10-12 feet.
If you absolutely need to attach battens to the roof, cut little channels for water to get through on the bottom of the batten, and use lots of good sealant (I recommend Solar Seal 900) between roof and 2×4, where you will install a fastener, and penetrate the roof. This might work, as sealant will create a “gasket” which won’t let water get through, and 2×4 will be securely attached to the roof surface.
I hope this all makes sense. Good luck.
Hi Steven I am from the east coast and I’ve done working Florida and all over the East Coast. Where we get tremendous amount of rain and snow. For a system this low of a slope you’re going to want to use a two ply modified system underneath your tile as when they nail battens down or screw them it will seal through the modified. It will not seal if you have TPO underneath.
TPO stands for temporary polyolefin
French don’t sell friends TPO
If you want a real roof check out Fibertite
Dont know what type of tpo you are speaking of ive been installing mulehide tpo for years in florida on manufactured homes and its a great long lasting product In fact we give a lifetime warranty on it. Never heard of this fibertech or whatever stop spewimg nonsense to people. Learn to sell your product without lying about others products.
Look online at the long-term studies of TPO membrane versus KEE membrane
I installed the first TPO roof in North America so I have about 34 years experience with the Tpo
Also look up TPO fires it is a highly flammable product
Thermoplastic olefin.
Probably because you’re too proud of the 2ply SBS, it’s a ‘French thing’ no doubt
I am having a new TPO roof installation on a balcony of my home, about 200 sq. id like to be able to put light weight patio furniture up there, table and loveseat. is it safe to put these directly on the surface or do I need to do anything else? Also possible an outdoor rug. Thoughts?
Can a lightweight chair and table be placed directly on top of a flat fibertite roofing system?
Hi Rhonda,
Yes, but only if you place a protective mat on the roof. Like fake grass or rubber floor mat – something to protect the roof from damage. Also you can use tennis balls – place them on the feet of your furniture.
No direct contact should be there between furniture and roof surface – if you do that, you will damage the roof, and it WILL NOT be covered by warranty.
Good luck
Another Albuquerque resident here. My roofer is pushing TPO. I want to know if tpo is compatible with a pellet stove chimney, double or triple wall? Is it safe?
Now I’m concerned about uv damage to the roof.
What to do?
Hi Bib,
UV is a problem for TPO. A few years back, there was a big talk about it in the industry, when MRCA published a report that TPO does not stand up well to heat / sun. Later, big roofing manufacturers “suppressed the study” and MRCA pulled the report from their website.
However we saved a copy of that report:
As far as Pellet stove. You obviously should you the most insulated exhaust pipe that you can find. triple wall should have no problem with TPO. However, TPO roofing is combustable (it will burn by itself), whereas PVC roof will not burn if you remove the source of fire. So maybe PVC is better for you.
Good luck.
Hello,
Can TPO install directly over modified bitumen? I have 20,000 sqft roof with fairly good modified bitumen.
Thanks
Willy
Willy,
Answer is NO for pretty much and singly ply roofing material. Direct contact with modified bitumen will in short time damage TPO / PVC / EPDM membranes, both physically (rubbing against granules) and chemically (asphalt/bitumen with damage the single ply material).
There is a cheap way out, using “slip sheet” which is a fabric made to separate asphalt-based roof from single ply.
However it is better to use at least 1/2″ fiber board (which is also fairly inexpensive).
Good luck
Can you install TPO or PVC roofing directly over modified bitumen? I was thinking just clean the modified bitumen.
thanks
Answered this in the reply to your other comment
We’re in Eastern Washington State near Spokane. Four seasons. Several local commercial buildings have been reroofed using glued-down HAY TARPS. Supposed to last around ten years or similar.
Has anyone ever heard of that? I inspected one and it seemed pretty solid. Had I not been told it was hay tarp I’d of thought it was TPO or similar. We just bought a commercial building which had temporary hay tarps spread loosely over the roof and it’s pretty impressive material. We may be modifying our roofs in the next few years and are thinking about going that route until we solidify our planning. The roofs have serious leakage throughout. We installed a metal roof over one section of the building.
We’ll be repairing/replacing substrate before covering. We may throw down a layer of thin plywood or OSB beneath the material. We are stripping all roofing material to lighten up a century of roofing materials due to concerns of winter snow load. We plan to insulate under the roof rather than above it. High winds are a concern.
Is this product susceptible to termites?
No
Hi,
We have an asphalt and gravel roof. It has several leaks. One of the roofer bids proposed tpo roof that will be installed over the gravel. Is that a good idea? I know removing the old roof might be costly, but what if there is dry root underneath existing roof? How can that be detected if the old roof is not removed? And will be mold growing underneath the new roof?
The rain season is coming, we need a decision soon…thanks
As soon as you stop the water flow (Leak) the Mold will stop. However if decking feels weak when standing on it, Then it should be torn off. You have to at least sweep the gravel off and put down an insulatin board to get a smooth surface for your new roof.
I am adding a garage to a home with flat roof using TPO. In planning the garage trusses, I was wondering if you had data on the load of the roofing material (Per SQFT), including the insulation panels.
John,
TPO Roof load is very low… 0.38 lb per square foot for material (50-mil thickness) … even with insulation you will be at around 1 lb per foot or less.
So just go with whatever building codes require in your are.
One thing to keep in mind – if you at some point decide to use that roof as a deck/porch (which is a very popular thing that homeowners do), you want to bump up your rafters by at least 2″ in width … probably more like +4 inches … so if you would go with 2×6 rafters, if you may add a deck later, go with 2×10 just to be safe. Definitely consult building code, and architect/engineer if you plan to do a deck later. Otherwise, just go with what building code says.
Finally, consider the snow load in your are, and the flatter the roof, the more wight will be on it from snow. I’d suggest you build in at least 1/12″ slope right away – this will solve many issues down the road.
Hope this helps.
Hi there,
We have a tar and gravel roof. It had several leaks last winter, so we decided to install a new
one. A roofer recommended a tpo roof. In his proposal it says that the new roof will be installed over the existing gravel. Is it a good idea? If he doesn’t remove the old roof, how can he detect if there is any dry root damage?
And will be mold growing underneath the new roof if it is installed over the old one? Also if the new roof is laid over gravel, will it not increase the risk of a puncture and you also couldn’t walk over the new roof if there is gravel underneath?
We need to decide fast, since the winter is approaching. We live in California, so there is no snow, but a lot of rain in the winter.
Thank you
Lisa,
You should at least scrape of the gravel. Also, if you leave the tar roof in place you should use 2″ PolyISO insulation as barrier between tar and TPO. You could use 1″, but I feel it’s too “thin” …
Removing tar is best option … but is expensive. However, it will provide access to fix any wood damages beneath.
Puncture usually happens from the top, not from underneath. Insulation protects the membrane (TPO) from tar/grave below.
TPO is not made for walking on it, and may void your warranty if it comes to that…
Finally, I understand it is a residence, and I don’t know of a single TPO product that has residential warranty anyway… so you may be better of with IB PVC (which is also a much better roofing product compared to any TPO) … IB has lifetime residential warranty and you have a ton of certified installers in California.
Good luck
I am in an historic building converted to condos right on the Gulf Coast that has a 15-year TPO flat surfaced roof, about five years remaining according to recent engineering study. We recently developed a pretty good size leak to the top two floors that appears to originate under the AC unit cluster where there is pooling of water after heavy rain. There is no apparent damage to any part of the roof that is viewable and even the buidling’s decorative masonry edges have been water proof bonded and appear to be holding well so my assumption is the roof was applied correctly.
Two questions from an HOA president who has zero roofing experience: 1) is the best way to isolate this to come from the underside to repair, or patch from the top even if we discover it is under an AC unit or other equipment; 2) any suggestions we should be aware of in this type of small, but crucial, repair when we are providing specs to a roofer?
Thanks much for any insight!
Dennis,
Before answering you questions, I think the best solution would be to add a drain in the lowest spot of the pooling area, to get rid of ponding water.
1) Repair should be done from the top. Remove all water (if any), wash/mop the dirt away, and PROBE and inspect all seams, corners and curb flashings on AC units, near pending area. Repair as needed.
During heavy rain, if possible, see if any water is coming from INSIDE the AC curbs, or from outside. You need to isolate the possibility that ACs themselves may be leaking (though it is highly unlikely).
2) I’m not sure what you are asking – specs are: fix the roof… You probably want to get an hourly rate for this as well as estimated time, as well as max time allowance. Have your super / maintenance guy, do the cleaning … you don’t want to be paying $100+ per HR per man, for washing your roof.
Thank you for your fast response. A roofing pro inspected the roof with me today. We have several drains in place. Unfortunately, there is so much debris from crumbled insulation and blown debris up there that functionally they allow several inches of pooling around them, so we will make sure that is routine maintenance going forward. He also found a place where a wind storm inspector left the TPO pulled away from the structure when he was looking at underlying material; it appears to have been acting like a funnel into the building. Between these two fixes, we will see how much progress has been made and will check the AC curbs as well. Thanks again!
What is the long term effect on TPO and large hail? We saw a 4 month old roof with baseball sized hail, no damage to the poly, yet the foam board is indented. What are the long term concerns?
Long term, TPO may (most likely will) cure/harden, lose elasticity, and then, hail storm may create cracks. Hopefully this doesn’t happen for long time.
In say 10 years when that process may start happening, you should still be able to patch cracks with new TPO. However, to avoid future compatibility issues, ask your roofer to give you some scraps of the SAME material they installed on your roof. You can use that later for patching.
In future, new TPO may or may not be weldable (compatible) with what you have now.
Good luck.
I have a TPO roof on my Class C RV. I have a small leak and have been advised to apply a coating. From reading tis thread, that seems like the wrong think to do. Is there a coating that would work?
@ Bozo ( really? 🙂 )
DON’T put coating on your roof … it’s not for waterproofing, and you won’t be able to repair it (roof) after…, because coating will interfere.
Since it’s TPO, it should be easy to weld in a patch, or even a peel and stick TPO patch will do the job.
The only “decent” coating is URETHANE, but again … you should not use it… just patch the roof.
Good luck
I’m inspecting a TPO roof covering with 8′-6″ wide rolls that survived Hurricane Florence on the NC coast but has large areas that are not adhering especially around the plumbing vents. The roof does not leak and the seams are tight and the appurtenances are all sealed tightly. TRying to determine if wind caused the loss of adherance or if there was an installation issue. The old BUR roof was removed and the TPO was installed over the existing fiber board. Any thoughts/
John … I’m not sure what cause membrane to delaminate from insulation… Maybe it was that way before the hurricane…
In any case, it’s an easy fix, if you so desire to do… put a few screws + barbed plates through the membrane, and weld a patch on top, that would cover the plate by at lease 3 inches.
This will hold down the membrane, and be watertight. Just make sure roof surface is cleaned thoroughly – first with warm water, and then with MEK or Acetone. Then weld your patches.
Good luck.
Weathered membrane cleaner for TPO, MEK/Acetone for PVC, no?
Bruce,
MEK will work for cleaning of both TPO and PVC.
Acetone will “strip” off top ply … use Acetone only if MEK not available.
Leo
I have an older white rubber flat roof on a NW beach cabin that is exposed to inclement weather. The local roofing company evaluated after noticeable interior leaking the roof has failed. The roofing company recommended a new 55TPO roof and when I asked if they will be removing the old roof.
Roofer Quote I am removing the old roof around the edges and I am also removing it anywhere feels soft.
Should I request the old rubber roof be removed before installation of the new TPO roof?
Linda,
What was the quote you got, and how big is the roof? Did you get additional quote for rubber removal?
Yes the old rubber roof should be completely removed. I mean it is fairly easy process… not like they are removing 3″ thick tar roof. It shouldn’t cost more than $300-500 extra to remove ALL rubber.
Leaving old rubber in place will cause sweating under TPO, which is not good. And it is just poor practice.
What can be done alternatively, is leaving the rubber, and installing a layer of ISO insulation … but to prevent sweating, rubber need to be sliced (cut) in many places… like big cuts every foot.
Still, if there is wet insulation below rubber, I think it’s best to just get rid of it all (obviously leave dry insulation, and replace wet).
PS, also consider PVC instead of TPO, and definitely get stainless steel edge metal (if you are near coast line, which I assume you are). Galvanized steel will rust in salt air environment. IB Roofs offers PVC coated stainless steel edge metal, as option with all their PVC roofs.
Cheers, Leo
What is the best adhesive for bonding TPO?
John,
Its best to use water-bases adhesive with TPO.
You apply it just to the substrate, and don’t wait for it to dry. Just put down your membrane, and it will adhere.
Also there is no smell that you would get from a solvent-based adhesive.
Cheers, Leo
I have a roofing contractor who wants to “fully adhere TPO roofing to shingles”, I have a small leak in the roof. They said i should put the tpo over the shingles because the slope of the roof is too flat for shingles. Can you adhere TPO to asphalt shingles?
Zach,
Technically you can adhere TPO to shingles, but that is one of the worst things you can do. Here is what it would look like after a few years:
(This was a Rubber roof, and you can see remnants of it on the skylight and around metal chimney vent. The stink from the was so severe, that you could smell it inside the house)
If I were you, I would never hire this roofer, and find one that will suggest to remove shingles and install insulation with TPO or even PVC roof.
TPO and asphalt shingles are incompatible, and asphalt will damage TPO over time… Never mine mold and mildew that you will get growing between the two, and a terrible stink that comes with it.
Fact that your roofer suggested this, tells you they don’t care about the result, you as client, and don’t understand the material they propose to install. Stay away.
Now about the roof itself – what is the slope on it? If it’s less than 3/12 than you should get some sort of a flat roofing material and not shingles.
If it’s 3/12 or steeper, than shingles with GAF deck armor underlayment will do the job. I’d also suggest sealing the overlaps on Deck Armor with Solar Seal 900 – that you shouldn’t have troubles even with ice dams.
Good luck
Leo
Thank You Leo!, I will be looking for a new contractor.
There are issues with foreign labor here, but I don’t think it would be inappropriate to bring a consultant from the States, to show my roofing crew how a particular single ply roof is installed. Hurricanes are a factor so the membrane will be adhered with adhesive, I’m sure we can handle that but, in a situation where the actual work is being done by novices, would it be best to use GAF’s EverGuard Freedom TPO Membrane with RapidSeam Technology to avoid bad welds. Are the seams as strong as heat welded seams otherwise, can proper seam welding be taught on the job and in one week’s time?
The supplier from whom I will be importing the materials suggested TPO. He seemed to be suggesting that TPO installation is easier than PVC, but from my research the techniques are the same. Is this the case, is TPO easier to work with?
We will be installing the roof membrane over pressure treated 2×6 v-joint. The space below is open, insulation is not required so from my research it seems that we can adhere the roof membrane directly to the roof deck, is this the case? I see that a slip sheet can be installed but that would be only for mechanically adhered membrane, right? Considering the need for repairs in the future wouldn’t it be prudent to install at least 1/2″ iso board and if so, how would you suggest it be adhered?
The job is a second story addition. The roof has a 6” rise in a 16 ft span. The existing structure is flat and has a GAF TPO roof. I’m uncertain which product was used but the home owner says that he has had no problems.
I know there are a lot of questions and any help would be appreciated. I expect that once I connect with an experienced roofer willing to come over I’ll get answers but meanwhile I am seeking your help.
What is the best roofing material for a flat / low slope concrete roof that will be used as a deck with foot traffic in central VT?
For a walking surface check out Decktec as it is more durable. TPO as any other single ply goes should not be walked on constantly or with great frequency. For this reason walking pads are installed on these roofs for high traffic areas.
How does TPO membrane hold up with hail? does the substrate matter? Does the membrane become brittle or degrade over time? 10 or 15 Years? I am a property specialist for a commercial insurance carrier in the mid-west and see many of these roofs.
How much water can rest on a flat roof? 10 x 12 area. Our roofer having a hard time with angling run off..
Jan,
Tell your roofer to use tapered insulation. On a 10×12 roof it will not be very expensive, and will give you the needed slope, as well as insulating value.
Good luck
We’re building a new home with a near flat roof… What’s the best TPO brands available today? Is 6mil thick enough for a roof with a deck on top? 2/3’s of the flat roof will have a deck. Whats the best way to install a deck on top of a TPO? The roof itself is going to be 12” unvented… Should we use Closed or Open Cell foam insulation under a TPO? What are all of the materials used on top of the OSB roofing sheets? What short cuts should I be on the lookout for with the contractor? What questions do I ask to make sure I’m getting the Ferrari of products & installations? Thank You! MK
Michael K,
Best TPO is PVC 🙂
I cant really answer what’s the best TPO, because manufacturers change their formulation too often.
IB roofs formulation has been the same for 40 years, since they brought it over from Germany.
TPO manufacturers change formulation to lower the manufacturing costs – so you never knownwhat you get.
Good luck
I doubt you mean 6 mil, but you likely mean .60 mil. 6 millimeters is the thickness of a cold weather wetsuit and I have never seen a roof material beyond ISO insulation at that thickness. .60 is great and .80 is even more durable, but not necessary. Remember this is so far an untested (longevity wise) chemical composition, so stick with the companies that do a lot and offer some sort of manufacturer warranty. Defects are rare, but do happen. Most of the time this is a very expensive roof to put on due to the select few roofers who specialize in flat or single ply roofing. These guys command a premium and can do so, because their tools and skill sets are unique to the roofing trade. Find a roofer with references, images, and locations you can visit, demonstrating their work, then you’ll know you have a quality applicator. Also, do not rush the job, do research, have realistic expectations for the time-table, prepare your home, your finances, and your contractor. This goes a long way to a solid installation.
A “mil” is defined as 1/1000th of an inch, it is not a refenced to millimeters. So, 6 mil is the correct way to state the thickness.
Tony,
It’s clear that he meant 60 mil, not 6 mil … roofing does not come in 6 mil … that’s a thickness of a construction trash back or thick plastic sheet. Basically I think we can put the 6 mil thing to rest… 🙂
PS – yes, MIL is = 1/1000 of an inch.
Cheers, Leo
TPO is a commodity product and is at the low end of quality and longevity in the single ply field. Try Fibertite instead it is a KEE membrane. TPO stands for temporary polyolefin
Bobby is joking. TPO stands for Thermoplastic Polyolefin
In every joke there is a part that is a joke … but also a part that is true 🙂
@Bobby
Just realized you said temporary … that is so funny 🙂
how can one fasten a solar panel into a tpo roof without losing the integrity of the roof or make the warranty invalid.
is there a special TPO fastener available or should fasteners be fixed to the roof with the tpo used to seal around the fastener???
after my certified roofer installed a tpo system on my flat roof and he knew ahead of time that the preexisting solar panels (helico) were to be reinstalled. he then claims he has no idea how to do this safely. please advise
thanks. I am in a bind since no one will take responsiblity for this reinstall and i am sure the solution is quite simple
thanks
Douglas,
There are a number of ways to do this.
1) Ballasted solar mounts, are held in place by weight of the ballast. A little on the expensive side, and also adds a LOT of weight on the roof. So if you live in the snow country, is not really a viable solution.
2) Weld on mounts:
These are the best in my opinion, because they are easy to install, super water tight, and can be fastened into roof substrate for additional wind resistance without worrying about leaks.
OMG sells a “generic” one, but I think it’s too weak. Anchor Products is a lot better, but is more expensive: https://www.anchorp.com/u-anchor-2400-single-ply/
Anchor products’ mount can be used on PVC, TPO, EPDM, and most other flat roof types!
I’m sure there are others, but I comparing AP’s and OMG’s mounts, I am definitely liking AP one better, and I did not encounter any other options so far. Also I know Joel Stanley (president of AP) personally. This “endorsement” is not because I know him, but because he has a better product.
3) There are mounting posts that you screw into the roof deck, and then patch around it, with “any means possible” like this one: https://www.quickmountpv.com/products/low-slope-mount.html?cur=3
However designers of this type of mounts did not think very well about the water tightness, and user has to rely on standard flashings of a given roof system.
Cost wise this will be much more expensive that option 2, because you have to add a standard pipe flashing, which typically costs $20-30+ each.
PS – your roofer is either an idiot, or doesn’t care, if he knew about the solar and did not have a solution. Regardless, I would not trust him to install solar mounts. I’d hold back on any remaining payments, and hire another contractor to do solar mounts …
However this will (most likely) void your warranty from the first guy – so I’m nor really giving you an advice here – you have to decide this on your own.
Lastly, solar mounts MAY void manufacturer’s warranty – so I’d investigate that part also. That said – most manufacturers will try to avoid covering any warranty claims at any cost, so it (manufacturer’s material warranty) is almost worthless!
I have seen many cases of TPO and PVC manufacturers either playing the “let warranty expire” game by not replying to requests, and outright refusing warrantable claims!
Good luck.
Will a TPO roofing system apply to glass mat sheathing at the backside of a parapet wall?
Michael, I assume you mean fiber-glass surface. If so, yes, TPO can be adhered to fiberglass surface such as that of Poly ISO insulation with fiberglass mat surface / DensDeck substrate, etc. You can attach say DensDeck to parapet wall, and glue TPO to it.
Hello TPO roofer,
I live in Sydney Australia, and I have purchased a very excentric home built in the mid 50’s. The flat (ish) roof is 1.2 m wide sheets of 2mm aluminum (No Insulation). The joints are overlapped + glued and an aluminum angle screwed down to secure the edges.
During it’s last 50 years, there have been occasional leaks typically resulting from a falling tree limb (the house is surrounded by huge eucalyptus trees on every side).
The substrate is in good condition (good oregon pine), but needs repair/replacement in some areas.
We are headed into an extensive renovation, and The Architect feels the roof should be repalced.
I agree, it does look tirerd, but as the aluminum has not deteroated, why would I remove it? I should be able to cover over it.
TPO is probably not hot-climate enough for the area.
Modified Bitumen would work, but I think there may be a weight problem with 2-layers + insulation.
PVC would probably work, but I feel easily damaged when I am on the roof every 3 months sweeping tree debris off the roof.
Looking at my choices, I was thinking spray-on would be a good replacement.
What are your thoughts?
Don Morris Lyda,
In your case and for any flat metal roof, the best thing in my opinion is coating – so you are on the right path.
In my experience, Urethane is best for coatings. Stay away from acrylic – it’s not really for waterproofing.
I don’t know what choices you have in Australia, but there should be plenty of products available.
Definitely not modified bitumen. PVC/TPO should be ok in your climate – i don’t think it’s any hotter than say Florida/Texas … but because you have falling tree limbs all the time, it’s not a good option. You don’t want to patch holes every 6 months.
Good luck.
Thanks for that. But I was surprised you didn’t mention rubber. Although I never considered rubber a high traffic membrane.
So Urethane spray-on is a possibility here. You are right about the heat, and easily achieving Texas Summer heat, but not as cold as Texas winter. We never hit freezing. Therefore, white is good.
Thanks again.
Don Morris Lyda,
I would never recommend rubber for a new roof – it junk.
TPO Roofer: Rubber is a great, long-lasting product, especially white EPDM for hot, sunny regions. However, for the amount of tree damage and foot traffic, any membrane system may be too tender. I would recommend against it, too. But for other applications, the company I used to work for used it all the time. They think EPDM is the Cadillac of flat roof materials. Considering its many positive features when fully adhered, I think they’re right. If I had a flat roof, I wouldn’t use anything other than a white EPDM.
Look at the puncture test for Fibertite
I have a 5’x5’ roof , I have have TPO material but no adhesive . What can I use for adhesive that I can buy at Home Depot or Lowes ? It’s just a deer stand roof !
Darrel,
Home Depot should have some rubber adhesive … probably. Each store is different. Also consider some local roofing suppliers – google them, call around. You should be able to buy a 1 gallon (hopefully) can. Otherwise it will be a 5 gallon pale, and you will have a lot of it left over.
Also I think best is water-based adhesive … it’s wet-applied – no need to wait for glue to dry.
Roofing suppliers should have no problem selling you just the glue.
Building a deck and looking for best material to build rain collection system underneath decking to prevent rain from falling through deck. Been planning to use EPDM but then came across TPO recently. Would TPO work better than EPDM?
Jack,
TPO would be way better than EPDM for deck waterproofing.
I recommend you go with 80-mil product, because (i assume) you will have deck installed over membrane, and 80 mil is much more durable than 50 mil.
Also you should do fully adhered installation over PolyISO or other rigid foam. I suggest you space our insulation fasteners so that deck framing is not directly over screws / plates – otherwise it may tear through membrane. Best to use 2-part adhesive foam to attach insulation to roof substrate, and then glue TPO over ISO… this way there are not screws under TPO, minimizing punctures from underneath.
This “sandwich” will cost a bit more in short term, but it’s MUCH cheaper than tearing off new deck, to fix leaks.
Finally, install separation strips of membrane between roof and deck framing – see this picture:
Also look at PVC… Good luck.
I have a deck covered with TPO, and wanting to cover it, but having a difficult time finding how to cover it without compromising it’s integrity. Your pic looks like it will be a deck, if so how will you be covering it? We’re thinking of sleepers attached to bases around the bottom of the posts.
What do you mean “cover” it?
Deck goes on top of roof. Usually there is a base board attached to wall of a house, and then sleepers are attached to base board with metal L brackets. Make sure you don’t penetrate TPO. Then just install deck boards over sleeper-rafters.
If collecting rain for consumption you may want to consider the chemicals found in the material, if that’s important to you. I have a TPO roof deck & a raincatchment too! No currently collecting rain off of the TPO (first flush wasn’t drained & busted during a freeze). Good luck to you & your collection!
I think in most states rain water is not “allowed” for drinking … only for irrigation.
I am a mechanical insulation contractor from PA. We have a trend up here of engineers specifying TPO as weatherproofing over our duct work insulation. In my experience in doing this it did not work well. The problem we faced is the TPO does not like to go around 90 deg bends. Do you have any helpful recommendations? Or can you provide a statement that I can give engineer’s that state that this product was not designed for this?
Jay,
My recommendation is to use PVC – it’s much more pliable (softer) than TPO, and offers excellent flashings, that would work magically in duct application. Think inside and outside corners, round flashing of different sizes, all pre-fabricated, and easy to weld in. Look at IB line of flashing components. Also Sarnafil is very soft, which would work great for you.
You can also look at FiberTite – their material is thinner than average, yet (supposedly) more puncture resistant due to fiberglass reinforcement.
I can’t give you a statement though 🙂
Are there any issues with a kitchen/range vent exiting through the TOP material? (grease, etc)
Yes there are issues. TPO will degrade if grease/fat gets on it. TPO is not chemicals resistant.
I’d recommend a product like IB ChemGuard (PVC), or some other PVC with Elvaloy.
However if you have VERY SMALL amount of grease, you can just add a 2nd layer of material around roof vent – say 3-5 fee radius, and you should be ok. Also, maybe double up on the vent flashing.
Hello, I was told by a roofing contractor to use an elastomeric coating, Henry’s enviro-white on the TPO roof. I put 3 coats on last summer and is holding up well. However, I talked to someone at Henry’s and they told me I should have used the tropic-cool, Silicone rubber based. Any thoughts? maybe I shouldn’t have used anything? I was told originally it is to minimize the amount of UV reaching the tarp. Thanks so much!
Dave, I’m very much against coating on single ply roofs, but at this point, you already have 3 coats, so there is nothing you can do, except hoping it doesn’t start to fail.
TPO material SHOULD be UV stable (not saying all of them are, but most)… so this coating was a waste of money. Never hire that roofer again and do not recommend them to anyone you know.
Thank TPO! I am not even sure I have TPO. I am guessing the coating can eat away at the tarp? I bought the house a couple of years ago. The tarp is white with black on the bottom, and it spans over different roof materials. Over shingles one area and over a metal roof on other parts. the roof leaked at one point, and then they apparently just placed the tarp over all of it at that time. I am sliding around on my butt to do any work up there, fearing I will damage the tarp . I will just try to keep it functional until It fails or I can afford a new roof. Appreciate your help!
Good afternoon. I live in Houston and have a flat roof. Actually, it is mostly flat and there are some areas that have shingles. The roofers have decided that we should replace with a TPO. I would very much like to hear your thoughts and thank you.
Nancy,
TPO or PVC are both good options.
Can anyone provide any insight to a tpo roof on an apartment which caught fire and the insurance only wants to replace half of the tpo roof? I would like my whole building replaced as this seems the right way to repair the damage.
Shelby,
In theory, they should replace the whole roof – in reality, you need a good public adjuster (PA) to work on your behalf. Insurance companies try to pay as little as possible, and many roofers don’t know how to get most money for you.
Good luck
Hi
We live in Albuquerque, NM. Is a TPO roof appropriate for our weather conditions and altitude? How does this roof compare to a metal roof for our area? We are very concerned about environmental impact as well as longevity, recyclability, long-term cost savings, and energy benefits.
We are also interested in a “sun tunnel” or other natural lighting solutions:
http://www.veluxusa.com/products/sun-tunnels/ and how much that would add to cost or other considerations.
Thank you so much for your advice.
Martin
Let me start with sun tunnel – this product is not designed for flat roof, so if you do use it, there is a chance of leak. With that said, TPO should have a big-enough round flashing. It depends on manufacturer of course – many TPO makers only offer 6″ wide round flashing.
Sun tunnel MAY NOT work with standing seam metal roof. The issue here is round shape and where you place it in regards to seams. Best to use it with “flat” metal roof profiles such as metal shingles. However, I assume that your roof is low slope, so metal shingles OR standing seam metal are not really and option for you.
On the other hand IB roofs (pvc manufacturer) has flashings as big as 16″, and can definitely make larger ones as custom order.
Now let’s jump int “environmental impact” … you need to look at it from several perspectives.
1) Energy savings during lifetime – both TPO and PVC are about equal in this regard. Metal is slightly worse, because you will probably choose color other than white. But in the end, they are all “cool roofs”
2) Recyclability – metal is the clear winner. PVC can be recycled. TPO probably also can be recycled. Problem is – its hard to find recycling facility that will take either TPO or PVC near you! With that said, I think PVC will outlast TPO in Albuquerque by about 10 years. Especially that TPO is not great in hot climates.
3) Long-term cost savings – as I mentioned above – you will likely get extra 10 years out of PVC roof such as IB, so need to compare upfront installation cost vs lifetime cost per year.
Bottom line – any roof is as good as its installer. Installation in crucial, so find a good roofer that specialized in Flat/Low Slope applications.
Good luck
I live on 300 Feet elevation and own a mobile home. I was considering covering the roof with TPO and I am a little concerned about snow load. The company that I contacted is offering me a 60mil TPO membrane white at a 3 years warranty only. Is this the usual warranty offered by any roofer? I live in a rural area and do not have a large choice on the matter, could you please help? Looking forward to your reply. Josiane Antonette
Josiane,
That 3 year warranty most likely refers to LABOR warranty FROM roofing contractor.
Material warranty should be at least 10 years… but I believe most TPO manufacturers have a minimum of 15 years material warranty. Now the thing is, most TPO warranties do not cover residential project, so you should find out which ones do. Call several TPO manufacturers and find out if they cover residential roofs. If they say yes, read their warranty, to be sure (phone reps often are clueless).
Ok, now to your main question – TPO has no problem with snow loads or snow in general. What’s more important is that your framing can handle the weight of snow. Also, since most heat goes out through your roof, I’d recommend 3 inches of PolyISO insulation on your roof. This will be expensive, but I think is well worth it.
Good luck – let me know if you have further question.
Leo
Hi,
I have a question concerning application of a TPO membrane over a 100,000 SF BUR that has leaking issues and is suspected of having high moisture content. In your opinion, can the overlying TPO roof be compromised as a result of the freeze/thaw cycles experienced by a water-logged BUR? Can these freeze/thaw cycles damage the critical seam connections of an overlying TPO Roof?
Arthur,
In my opinion, moisture in BUR should not compromise seams (given they are welded properly). However, it most likely cause mold and rotting of the substrate AND is an increased snow load on your roof.
So my strong recommendation is to remove BUR and repair and rotted / corroded substrate. I hope you don’t have light-weight concrete there … if that has water damage, you can’t install new roof over it, and need to do massive repairs …
Good luck
Hi, so our home has a really low pitch roof preventing us from using your standard asphalt shingles. When we purchased the home it already had white TPO roofing material. So when we went to pitch the roof on the back part of the house, we had the roof completely redone in white TPO. Now our house just looks like an ugly tent has been placed on top of it. Are there any options to making this look better? Can we paint it or add something on top of it (without puncturing it) to make it look less like a tent?
Chanelle,
You can try painting with acrylic paint, but it WILL come off sooner rather than later.
Unfortunately, the bad news is – you would have to get a new roof installed there. The good news is – there is a material that is a membrane (like TPO) but has asphalt shingles imprinted on it, and looks like real shingles roof.
It’s a PVC roof called IB Traditions. To install it, the TPO would have to come off completely (but you can reuse old insulation).
Is ice and water shield compatible with too roofing systems?
Sean,
Not really. Bitumen should not come in contact with TPO, so don’t apply ice and water shield OVER tpo. If ice and water is underneath, you should still use a separation layer – this is usually 1″ or more of ISO insulation, or a slip sheet.
Interested in in your opinion about re-roofing with a TPO system over existing mod bit. I am wrestling with a roofing contractor that only wants to remove the “bad spots” — bubbles, blisters, cracks, etc. Wondering if it is better to remove all existing. This is a one story school building, approximately 50,000 SF. Structure is bar joist and metal deck with a 2″ lightweight concrete layer over the deck. It is 50 years old and has had chronic leaking and multiple fixes and band aids over the years.
Thank you!
Larry,
TPO can be installed over existing modified bitumen roof. It’s always better to remove old roof, but is not necessary, and is costly. If there is only onel layer (need to do core sample – cut a round hole in the roof down to the deck) and see how many layers you have.
You see – the problem is that light weight concrete is likey in very poor shape, becuase of years of leaks. Metal deck is also likely rusted in many spots. Bottom line – you may end up redoing not just the roof, but the whole structure. It may be cheaper to demolish the school and start over … just kidding … but I don’t know waht to tell you. That is a descision you and the school need tot make.
Definitely get more quotes from commercial roofers who don’t fight you on tear-off.
Good luck.
can TPO be painted? specifically where it comes up vertical parapet walls? i know- why would you paint it, but the owner of this property does not want white surfaces going up the wall 2 feet. they want the wall to all be same color as it was. ( as it is higher above the stucco stops) the walls go up another 6 feet there.
Yes – you can use acrylic paint.
I highly advise against painting ROOF surface! If you do, you will never be able to install patches / do repairs, without scraping off the paint.
Also paints are not effective as roof sealers.
Good luck
GAF makes coatings that can be used on TPO roofs.
Sure – many companies make coating that will work with TPO, PVC, Rubber, etc. I am still very much against coating of single ply membrane roofs. Once the coatings start to peel, you cannon fix repair the roof – your only option is to coat more (waste of money and will probably fail), or sit there for hours, trying to scrape off the coating.
And why would you coat a white roof anyway? If there are leaks, most roofs can be repaired.
Can white TPO be installed directly over en existing black rubber membrane coating? Or does the older black membrane need to be removed. The current roof does not leak and appears to be in good shape. I simply want to lower the heat that transfers into the house.
Nick
Answer is NO, but there are ways 🙂
So ideally, you should remove rubber – it’s cheaper!
If you want to leave rubber, you need:
1) Make a lot of cuts – just slice into it with a razor blade knife all over the place. This is to let moisture from under the rubber go thought and vent out. Basically you can cut straight lines every 2 feet apart.
2) You need a separation sheet between rubber and TPO to prevent rubber from damaging TPO membrane chemically.
3) Install TPO on top, using mechanical fastening (screws and plates).
But it would be better and cheaper to just remove rubber and reuse old insulation – glue or fasten TPO over old insulation or new.
Good luck
TPO can not be installed directly over EDPM but PVC can! PVC can be installed over BUR and EDPM. Look into Duro-Last PVC roofing material. I had a number of roofers come to look at our 5000+ sq ft roof made up of EDPM and BUR – most wanted to tear everything off and start fresh, all the quotes were well over $100k to do this, one quote came in close to $200k … for a roof! I was getting fed up and contacted a roofing specialist that only works on warehouses and I was given real answers that made sense environmentally and monetarily. PVC is less expensive than TPO, lasts longer and is fire retardant. Plus you are not creating more waste for the landfills to process. Check out this video – https://usa.sika.com/sarnafil/en/why-sika-sarnafil/tpo-failures.html
It’s easy to be confused when evaluating roofing material solutions for the flat or low slope roof. By understanding something about the source such like these pros and pros of TPO roofing you can make a better choice. However, being a roofer I would like to say the copper roofing would be a much better choice if you can afford it. It makes your roofing long lasting and eye-catching as well.
Please note that the smallest amount of copper in a stream system can kill salmon and other fish. Copper is a wonderful metal for may things but using it on homes where water is coming in contact with it and going into runoff directly to streams can be very harmful. Many people do not realize this.
That is a great point Gretchen, I have not thought of that.
Fortunately there aren’t many copper roofs along river fronts. Actually not many copper roofs around at all, because they are too damn expensive. So most fish is safe from rich folks who don’t know how to spend their money better than to install a $30/s.f. roof 🙂
Curious about the ability of TPO to stand up to tremendous snow load. There has been discussion about UV, but not the opposite, cold and snow? We are talking about 3-4 feet of standing snow for 6-8 months.
Carrie, I believe most TPO brands should be find with standing snow, assuming the following:
1) Seams are properly welded, so the roof would not leak under snow (there will be melting down below, between snow and roof.
2) This is obvious, but roof structure must be able to support this type of snow load. I mention this because say in New Hampshire where lots of snow is common, roofs often collapse and roofers always have work in the winter, removing snow. Snow removal costs money and dumb roofers often damage roofs in the process … either by ignorance/stupidity or on purpose (to make work for later).
Otherwise I don’t see big issues with gold weather… but you should research a specific brand that you are considering
Good luck, Leo
Our roof deck covers two bedrooms below and serves as patio during warmer months with foot traffic and patio furniture atop. The current roof is a twenty to thirty year old modified bitumen that is starting to crack. There are two soft areas, one with water leaking down to the plywood substrate.
Two roofers have submitted estimates. Each recommends installing one half inch insulation board (IsoGuard in one case, an unspecified brand in the other) over the existing roof with a single ply membrane (TPO for one, IB Roofing PVC for the other) as the final cover.
Will isoboard insulation almost certainly deform when subjected to the intended use described above? Can it successfully bridge twelve to eighteen inch soft areas? Can I expect either the TPO or PVC to perform at least as well as the modified bitumen? Does the slippery nature of both TPO and PVC when wet render them unsuitable for use as a recreational walking surface?
Thanks in advance.
Skip, excellent questions … not most reefers ever think about these.
So first – do not hire either of the roofers that gave you quotes already! Here is why:
1) If you have soft spots, the Mod-Bit must be removed and substrate fixed. I know this means more $$, but if you live wet stuff there, it will only cost more money later, and you would have to remove new roof to fix the problems.
2) ISO insulation WILL deform and should not be used if you have foot traffic. Also white TPO/PVC should not be used either! I will discuss this below.
ISO will not “bridge” soft spots.
What I recommend you do:
1) Remove old roofing and repair rotted substrate.
2) (OPTIONAL) If you need insulation, install 1-3″ of ISO Board. I recommend a minimum of 2″ to increase thermal resistance. ISO should be mechanically attached (screws and plates) OR fully adhered with special 2-part insulation adhesive (expanding adhesive foam).
2a) Install 1/2″ or 5/8″ DENS DECK or other moisture resistant rigid substrate. This will be your “walking surface substrate”. DensDeck is very hard, and will not break when you walk on the roof later.
3) Install special Deck Membrane. There is no TPO product for this, but there is an EXCELLENT IB PVC DeckShield product that we installed on many roof decks with great success! You may look for alternatives, but I believe that DeckShield is the best there is in US.
DeckShield is made for foot traffic / grills / patio furniture and to provide excellent water tightness. Now the warranty on it is “only” 10 years, but it should last at least 30, with proper installation and if you don’t abuse it (meaning you don’t go out of your way to puncture it). Warranty is limited to 10 years because they know you will have foot traffic.
Here is how deck-shield should be installed:
DeckShield should only be installed over DensDeck or similar, and must be fully adhered (glued) – no screws, except for along the perimeter.
Here is DensDeck installation – note joints are “plastered” so that membrane would be as smooth as possible:
And here you can see it in HD quality – welding post flashing:
Now I know you got a quote from an IB Installer, but because he specified 1/2″ ISO over leaking/rotter Mod-Bit, I would not use them. Instead contact IB roofs for other certified contractors in the area.
PS – with many other membrane products (TPO/PVC/EPDM) your warranty is null and void if manufacturer finds out there is “foot traffic” …
PS2 – ISO brand has no difference – it’s pretty much same product, no matter who manufactured it (unless you go for super high density). The only purpose of ISO is to provide thermal insulation and ability to fully adhere membrane to it (that’s what fiberglass mat is for). Brand does not matter here.
Hi
I was wondering for a science fair does TPO keep the house cooler
We installed 60 mil white TPO over our old modified roll roof with a 2″ ISO board underlayment pver the modified.
The results have been spectacular:
No more leaks.
The highest cooling bill, in Houston Texas, with a 2500 sq. ft. single story house has been $67 this yea.
The roof has been easy to clean with Simple Green.
It stood up to Harvey with no problem.
I’m thinking of installing a TPO roof and i live at a high altitude (7000-ft) in New Mexico where the UV radiation is intense. Do anyone know if it has been used in New Mexico? How well does it perform?
I noticed your question on TPO being used in New Mexico. We are in New Mexico as well, and wondering the same. If you have gotten any further information would you mind passing it along. We are going to have a sun room and shop done this January.
Thanks in advance if you are able to pass along any information.
The roofer uses Genflex TPO roofing. So, They may guarantee the TPO for say 20 yrs but what about the seams. It comes down to skilled labored. If the seam isn’t done correctly all bets are off. Then, who will pay for the possible mold remediation and other damage? So, I decided to pitch the roof and do asphalt shingles.
Dave & Paul – I recommend you read this TPO advisory from Mid-West Roofing Contractors Association about TPO and high temperatures + UV … http://tporoofing.org/overview-of-mrca-advisory-on-tpo-roofing/
In short – I’d be reluctant to use TPO in your case.
PS – advisory made a lot of noise in the roofing industry and has since been pulled by MRCA’s website (I assume under pressure from TPO manufacturers).
FR-10 is a fire sheet. It’s a gypsum impregnated fiberglass sheet. Comes in a 10 square roll by four feet tall. Is itchy but gives a class a rating to the roof.
Hi, how about compatibility for Re-roofing on Bitumen roof?
how many layers are normal for installation? What is FR-10?
Joye,
You can have 1 layer or 10 – the difference is in cost, which goes by total THICKNESS of your insulation, which is converted to R-Value.
In most cases roofers install POLY-ISO rigid foam insulation – it can go from 1/2″ per sheet to 3.3″
1 inch of ISO is 6-R, 2″ = 12-R, and so on… 3.3″ is 20-R
You can stack as many sheets as you want, as long as fasteners are long enough to hold it down properly.
I’m not sure what FR-10 is
Good luck
Which manufacturer of TPO has been around since its conception? Thanks.
Christopher,
It’s hard to say, because TPO material (for cars for example) has been around very long time. I’d say most big name TPO manufacturers today, started at about the same time… but the problem is – not when they started making TPO, but what formulation / generation you actually buy – because it’s pretty much impossible to determine this by reading labels on material rolls, and not a single manufacturer publishes this data.
Basically it’s often a gamble – some roof suppliers still sit on inventory of 1 or even 2 generations old product.
As many have pointed out, because of all these reformulations, many products can only be installed OR are recommended to be installed with seam tape and primer / adhesive. This pretty much negates ANY advantage that TPO may have vs PVC, and makes it BETTER to use WHITE EPDM RUBBER instead of TPO, since white EPDM is still cheaper, and seams will hold better!
Hope this helps – Leo
We had the Versico /carlisle 60 mjl too installed early this year. Of course, after 1 year its still great but I’m hoping it’ll last 15 years minimum. It has a 20 year warranty.
Am I supposed to go up and check seams all the time?? Anybody know how this brand is? Is it considered one of the better manufacturers?
Does anyone have experience with Mulehide TPO roofs?
Jack
I believe Mulehide is a Carlisle brand, so their TPO should be the same as Carlisle / Versico
I want to see your qualifications.
Derek TQ RRO
Just a few years ago (about 5) a study was performed in los vegas I believe, where the weather is dry and hot. they adhered TPO membranes from several different man. and found that they weather very badly in short amount of time. only like one man. came out with a decent report. within like 7-10 years. I cant remember who it was done by (one of the roofing organizations). If things change since then, then you are probably safe but for me it is still too early to take a chance with that type of membrane cause repairs are not very cheap and easy. I still see today a lot of seams curling up and even though their are tapes and such, even those fail as well.
I have been a roofer for many years have installed all types of roofing from built up to EP DM to TPO and PVC .EP DM in hot weather cracks in splits have replaced many roofs In Florida. My first TPO roof was installed in 1996 and the material is still intact .new stripping an calk were required only maintenance done .versico roof I have personally oversee installations on Walmarts targets airports schools in the millions of square feet so I get a kick out of this TPO bashing
Slippery in bad weather
GAF Manufacturer’s Extreme TPO will stand up to the heat. TPO has actually been around for over 20 years now. There were some bad TPO’s that came out initially, but today most manufacturer’s TPO is of better quality than the first formula’s that came out.
To repair little splits and blisters in felted roofs,
open up the top layer of the felt with two knife cuts
at right angles. Built-up roofs are built flat and as one so
when a leak occurs it can be difficult to place the location of it, causing one to have to dismantle the entire roof.
Understand of course that these kinds of costs are for
new contemporary homes and simply supply you with a limited capacity of
electric power.
Would TPO work as a roof and deck combo? The upper floor of a duplex is using a roof over the lower porch as a deck. I would like to put down a good roof and then put outdoor carpet on top to protect it from puncture. There is also the issue of trying to waterproof the handrail posts, which attach to the roof.
I would love the answer to this question
I have a passive solar home in Sacramento CA. It is a flat roof tar and paper. I also have 4-8 inches of dirt that helps with the insulation of the house. Roughly 2000 sf of the roof is covered with dirt and plants. The house was built in 1978 and I purchased the home in 1997.
When I exposed the tar roof to cut in some solatubes a couple years later, the roofer who did the job remarked how the tar had barely crystalized because it was covered with dirt. He thought that that roof would last forever.
I’m familiar with TPO because of my previous job where we re-roofed commu ication shelters and I was impressed with the warranty that the roofer and manufacturer gave us. Now I’m wondering if TPO would be right for me at my home but I would like to know how it stands up or if it would break down from being in constant contact with dirt. Hey, do you guys need a test home? Thanks, Dave
I would highly recomend using walkways not only to protect your roof as well as the look. most iinspectors require them as well
WOULD 1′ POLYISOCYNURATE BOARD BE A SUITABLE UNDERLAY FOY 0.06 TPO ROOF AND WOULD YOU RECOMMEND MECHANICAL FASTENING OR IS THERE A SUITABLE ADHESIVE.
Are walkways required and what is the best and most cost effective to have?
Hi Bill,
Walkways might be required – this will depend on manufacturer and architect. It should be installed around HVAC units and in areas of foot traffic.
Most cost effective way is to purchase and install them – there is no other way.