Tag Archives: GAF Everguard TPO

Residential Low Slope

Why EverGuard TPO is Great for Homeowners

If you’re a homeowner with a low-slope roof, you’re probably well aware that your options for roofing systems do not include the most common type of material: asphalt composition shingles.  Instead, your roof needs a waterproofing membrane like the single-ply options — TPO, PVC, EPDM — and the multi-ply option: torchdown modified bitumen.

These membranes are needed for low-slope residential roofs because asphalt shingles have overlapping seams that are not perfectly sealed, which exposes them to moisture seeping beneath them by entering upwards from their lower edge.  Waterproof roofing membranes don’t have this issue because their seams are welded, forming them into one cohesive unit.

Each of the different types of low-slope membranes serve different purposes for homeowners, and we believe the best one for the majority of low-slope homes is GAF’s EverGuard TPO 60-mil membrane.  It is one of the most cost-effective roofing membranes in the industry.

GAF has dedicated a tremendous amount of their resources to advancing TPO technology, and the result is a product with fantastic longevity that saves on material and labor.  When GAF conducted the largest independent study to date on TPO, among its key findings was that EverGuard Extreme® TPO and EverGuard® TPO are the top performers regarding longevity.

Furthermore, GAF offers the best warranties we know of.  As Master contractors on the low-slope side of GAF, the company trusts our craftsmanship and attention to detail so much that they allow us to provide our customers with the Diamond Pledge™ NDL Roof Guarantee.  With the 60-mil system, this warranty provides no dollar limit (NDL) coverage of material and workmanship for 20 years.  Other products, like Everguard Extreme® 80-mil can have up to 35 years no-dollar limit warranties.

The Diamond Pledge™ is such a great warranty that it means that when Chase Construction North West, Inc. installs an EverGuard® TPO roof for you with the warranty, you can have peace of mind that your new roof is super reliable, and that if there are any leaks resulting from material defect, ordinary wear and tear, or workmanship error over the next 20 years, GAF will pick up the tab to fix it.


For homeowners with low-slope roofs, GAF EverGuard® TPO 60-mil membrane provides the best combination of savings and reliable performance of any roofing membrane.  The 20 year Diamond Pledge™ NDL Roof Guarantee is a remarkable warranty that ensures that your roof is installed by the best professionals and that leaks for the entire length of the warranty period will be covered by GAF in full.


If you’re a homeowner with a low-slope roof, and you need repairs or a new roof, CHASE CONSTRUCTION NORTH WEST, INC. wants to help!  We specialize in residential low-slope for Tacoma, Seattle, and surrounding area, with reach as far as south as Olympia.  If you’re looking for a roof with a no dollar limit warranty that will protect you and your investment, call us now for a free estimate at (253) 445-8950 or fill out our quick estimate form!

How Should Your TPO Be Applied?

Fully Adhered or Mechanically Fastened?

Yet another roofing debate that we find ourselves coming across here at Chase Construction NW, Inc. is whether to install TPO using the mechanically attached (MA) or fully adhered (FA) method. While both are fully warrantied, and everyone has a preference, it is still a subject that comes up quite often. So which one is better?

Let me give a brief overview of each method using the most basic assembly components (membrane & insulation). Keep in mind typical specified assemblies will often include other components such as a vapor barrier, substrate board (fire rating), and or a coverboard (traffic, hail, protection).

Mechanically Attached (MA)

Mechanically Fastened is the most common, and cheaper of the two methods, though price may be the reason for its popularity with contractors. A typical MA assembly often includes multiple layers of rigid board (4’x8’) insulation with the base layer being installed loose and the top layer being secured with plates and screws that are driven through both layers of insulation into the roof deck.

The bottom sheet of membrane is mechanically attached using screws and plates before the next sheet overlaps the fasteners and is hot air welded to the sheet below concealing the fasteners.  The hot air weld creates a monolithic sheet with a water tight seal. Some contractors swear by this method stating that it’s faster and more economical.

Although the MA system is cheaper to install, it comes with some inherent issues.  For instance, when a strong wind blows across a MA membrane roofing system, the uplift from the wind will cause the membrane to flutter, or even billow at times depending on the strength of the wind.  This can cause issues as conditioned interior air from below is drawn upwards into the roofing assembly potentially causing condensation, especially in winter months.  This scenario can be exaggerated if an Air/Vapor Barrier isn’t included in the assembly.

Leak tracing is another potential issue with a MA system. If the membrane is punctured, the water can travel between the membrane, insulation and roof deck before manifesting below. These leaks are more difficult to locate which makes them more expensive to repair.

Fully Adhered (FA)

Much like the MA assembly, the typical FA assembly often includes multiple layers of rigid board insulation with the base layer being installed loose and the top layer being secured with plates and screws that are driven through both layers of insulation into the roof deck.

Fully Adhered insulation assemblies over concrete roof decks are typically installed using Low Rise Foam (LRF) adhesive instead of mechanical fasteners.  Using LRF eliminates the need to pre-drill the concrete before fastening which is a production killer.

After the insulation is secured, the membrane is rolled out, overlapped at the seam, and then fully adhered to the insulation using a solvent based bonding adhesive.  After the membrane is overlapped and adhered, it will be hot air welded at the seams to create a monolithic sheet over the entire roof.

Although this method is more expensive (adhesives) and takes longer to install, promoters claim the benefits outweigh the cost difference.  Not only is a fully adhered system more aesthetically pleasing (no wrinkles), it’s much more resistant to wind uplift.  The FA system has the benefit of spreading the wind uplift over the entire roof as opposed to point loading the seams as in a MA system.  Additionally, a fully adhered system is much more resistant to drawing the air from below into the assembly like a MA system.

So Which is Better?

Although each method can achieve great wind ratings and are fully warranted, the majority of roof consultants prefer a fully adhered single ply assembly over mechanically attached.  They like that fully adhered systems offer symmetrical wind loading, don’t draw conditioned air into the assembly, prevent condensation and potential fastener corrosion, and better aesthetics.

Ultimately, the determining factors are the project specific building characteristics, budget, building location, and the building structure itself.  A professional roofing contractor or design professional is best equipped to determine which approach to use given this criteria.

Regardless of whether the membrane is fully adhered or mechanically attached, the most important factor is choosing the right contractor to perform the work.  It’s critically important to engage a contractor who is certified with a membrane manufacturer.

Certification signifies the contractor has the training and manufacturer support to design assistance when needed.  Additionally, a certified contractor’s work will be inspected to ensure manufacture guidelines and specification details are followed, it’s like an insurance policy.

About Us:

We at Chase Construction NW, Inc. are passionate about roofing! Whether you are looking to have a TPO system installed or repaired, or you are looking for a different roofing system all together, we can do it for you! We have been Master Elite® Roofers with GAF for 8 years and have been installing quality roofing systems for 16 years. Let our passion turn into a quality roof for your building or home! Contact us today by filling out our free estimate form or calling us at 253-445-8950.

Commercial Roofing Chase Construction North West Inc.

A TPO Study

TPO – An Independent Study

Results From the Largest Independent TPO Study

Our friends at GAF saw that TPO roofing systems are increasing in there popularity, but that the confusion about what brand performs best is also increasing. What did they do about it? They decided to engage Structural Research Inc. (SRI), a well-known and highly respected laboratory that has done testing with UL, NRCA, and MRCA, to perform the largest, independent performance study of the four major U.S. TPO brands.

TPO Roofing ContractorSRI independently obtained various rolls of all of the major TPO brands from GAF to Firestone, a total of 45 in all. Over 400 samples were cut from the 45 rolls, and those samples were subjected to over 6,000 individual measurements over the course of the study.

The Results

The first finding was that all of the brands that were tested exceeded the minimum ASTM D-6878 standards. No brand was significantly better than the other though there were variations in the three key physical characteristics (overall thickness, thickness over scrim, and weld strength).  There were however significant differences between brands in accelerated aging tests. The most important indicator of how long a TPO membrane will last is accelerated heat aging. GAF EverGuard Extreme® both in the 60 mil and 50 mil both had no visible failures for over 190 days. The second best performing membranes were GAF EverGuard® TPO and Firestone TPO, at 112 days and 105 days. And finally, coming in at 77 and 70 days was Carlisle and Johns Manville. Weight lost during accelerated aging tests had even more significant differences between the brands tested. GAF EverGuard Extreme® both in the 60 mil and 50 mil again at over 190 days. Number two is GAF EverGuard® TPO and Firestone TPO, at 125 days and 136  days. And finally Carlisle and Johns Manville, which first failed at 56 and 70 days. GAF TPO StudyFrom the GAF Website: “While SRI was looking for cracking, they also weighed each sample. Once the sample lost > 1.5% weight, the sample was deemed to have crossed a threshold where the membrane becomes more unstable (and susceptible to cracking and/or erosion). Just as with cracking, the reason that weight loss is a great indicator of TPO performance is that weight loss can lead to erosion. The picture below shows a failed roof where the weathering layer has eroded to the scrim. “

Chase Construction NW, Inc. Can Install It For You!

GAF Master Commercial Roofing CiontractorThough there was no significant difference in the physical properties of the different brands of TPO, there is a big difference in accelerated aging! This proves that GAF EverGuard Extreme®, both in the 60 mil and 50 mil, is a far superior product. And as GAF Master Commercial Roofing Contractor, we are the elite in TPO installation! We are Master Elite Roofers with GAF for residential applications as well! We specialize in all types of roofing, steep and low slope, composition shingles, wood shakes, metal roofing, slate, tile, torchdown, PVC, TPO, EPDM. We also specialize in roof leak repair. So if you are in need of a new roof, or just a repair, we are here for you! Call us today for your free estimate – 253-445-8950 or fill out our quick estimate form! We look foward to working with you!

Check out this video of Chase Construction NW, Inc. installing a TPO Roof in Renton, WA!

GAF Conducts Telling TPO Experiment

The Largest, Independent Performance Study

Given the roofing system’s rising popularity, manufacturer GAF set out on the largest ever independent TPO study to debunk some myths and exaggerated claims about the roofing system as well as learn more about it. GAF utilized Structural Research Inc., a highly respected laboratory, to perform the largest, independent performance study of the four major U.S. TPO brands. SRI conducted a variety of ASTM physical property Chase Construction North West Inc.testing including thickness above scrim and weld strength which showed mostly equal performance among the brands. It wasn’t until accelerated aging using ASTM heat aging, weathering, and weigh loss tests-associated with long-term membrane performance- were conducted that the various TPOs exhibited significant differences.

(The four brands tested on were GAF EverGuard Extreme® TPO (50 and 60 mil), GAF EverGuard® TPO (60 mil), Carlisle Sure-Weld® TPO with OctaGuard XT™ (60 mil), Johns Manville TPO (60 mil), and Firestone UltraPly™ TPO (60 mil).)

Key Findings

The study came up with four key findings. First, all the brands tested not only met, but exceeded minimum ASTM D-6878 standards. While there were clear variations in major physical characteristics (overall thickness, thickness over scrim, and weld strength) of each GAF Chase Construction North West Inc.brand, no brand was clearly or significantly better than any other in these tests. However, their second finding concluded that there were substantial differences between brands in accelerated aging tests. This method is one of the most important indicators of how long a TPO membrane will last. The top performing class were GAF EverGuard Extreme® (60mil) and EverGuard Extreme® (50mil), both of which had no visible deficiencies for over 190 days. In second Carlisle Chase Construction North West Inc.place were GAF EverGuard ® TPO and Firestone TPO, which failed at 112 days and 105 days, respectively. The third best performing membranes were Carlisle and Johns Manville, which failed at 77 and 70 days. The third finding found that there were even more significant differences between the brands in the amount of weight lost Firestone Chase Construction North West Inc.during accelerated aging test. During the ASTM accelerated aging test (D573 @ 275º F), SRI recorded noticeable differences. Weight loss is important because it can lead to erosion and membrane failure. Once the membrane has experiences 1.5% weight loss, degradation occurred rapidly and the membranes were considered to have failed. The ranking among the Chase Construction North West Inc.brands was the same as in the last finding. Lastly, there was surprising variation in the consistency of membranes produced by each brand. It is logical to think that membranes manufactured by a single manufacturer should be relatively consistent from one production run (or plant) to another. However, the study found that some brands perform much more consistently than others. The brands that showed the greatest consistency of production were GAF, Firestone, and Johns Manville.

What Does All This Mean?

The heat aging test includes bending over the sample over a 3” mandrel and inspecting it with a 7x eye piece. If there is cracking found, the sample is considered to have failed. TPO Roofing Chase Construction North West Inc.The picture to the right shows a roof that has failed due to cracking of the TPO. While looking for cracking, the SRI also weighed each  sample. Once the sample lost over 1.5% weight, it was deemed to have crossed a threshold where it is more unstable and therefore susceptible to cracking and/or erosion. Just as was the case with cracking, the reason that weight loss is an excellent indicator of TPO performance is that it can lead to erosion. The picture to the left shows a failed roof where the cause was that the TPO Roofing Chase Construction North West Inc.weathering layer had eroded to the scrim. A fundamental takeaway to take from this is that at the end of the day, it doesn’t matter which failure happens first ( cracking or weight loss)  because failure is failure. The data shows that in terms of cracking or weight loss, the best performing TPO membranes are GAF EverGuard Extreme® (60mil) and EverGuard Extreme® (50mil). The second best were GAF EverGuard® TPO and Firestone TPO, and in third place came Carlisle and Johns Manville. As a closing remark, though TPO has a proven record of performance without systematic failure, there are significant differences among membrane brands and GAF is leading the industry with its EverGuard Extreme® and EverGuard ® product lines. Congratulations GAF! We are proud to be trusted Master Elite roofers with such a reputable manufacturer.

About Us 

Here at Chase Construction North West Inc., we have many years of experience in TPO roofing. Below is a picture of a recent job we did utilizing this innovative and reliable roofing system.

TPO Roofing Chase Construction North West Inc.

We have worked with GAF products for over 13 years and have earned their coveted Master Elite® status that only 2% of roofers in the United States hold. Call us with your roofing needs today Puget Sound!  We provide services in King County and Pierce County, along with major cities such as Seattle, Tacoma, Puyallup, Federal Way, Renton, Auburn, Des Moines and all of the surrounding cities. Contact us today by filling out our free estimate form or calling us at 253-445-8950.

Commercial Roofing Chase Construction North West Inc.


Check out this video of our crew installing a TPO roofing system in Seattle, WA!