Tag Archives: 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.

Fully Adhered TPO In Renton, WA.

Screws Or Glue? What Is The Difference?

If you are in the roofing industry it is more than likely you have installed a TPO flat roofing system before. However, the question that comes to mind when you are facing a flat roofing project requiring a TPO membrane is whether or not to go with fully adhered or mechanically attached! What is important is that you know the difference between the two to ensure you install the appropriate roofing system for the project to guarantee it withstands time and our environment.

Mechanically Attached

A mechanically-attached roofing system is a membrane roof that is attached to the substrate; i.e., wood, concrete, steel, etc., by mechanical means. This mechanical attachment could be with screws, concrete nails, augers, etc. The fastener used is almost entirely dependent upon the substrate (type of roof decking). Any insulation, substrate board, or cover board that is a part of the roofing assembly would also be attached into the building’s roofing substrate, either directly or indirectly by means of the direct attachment of the other, adjacent components. Often these “intermediary” components are attached independently of the roof membrane and are done with sufficient fasteners and in a specific pattern so as to achieve particular wind up-lift ratings, if such are required. The membrane roofing system is then installed on top of and through those intermediary components and into the roofing substrate. Since the insulation in a mechanically-attached system is attached separately and then is further secured indirectly when the membrane roof is installed, the number of fasteners required to “fasten” the insulation to the substrate is much lower than a fully-adhered roof.



▪ Adaptable to unusual roof configurations

▪ High wind uplift performance

▪ Low material cost

▪ Lightweight

▪ Fast installation



Fully Adhered

A fully-adhered roofing system is a membrane roof that is attached to a roofing substrate indirectly using adhesives, which is just a fancy word for glue. Sometimes the roofing membrane is installed directly on top of the roofing substrate. But usually there is insulation and maybe even a coverboard that is also part of the assembly. If that is the case, then obviously the roof membrane is attached to the insulation (or cover board) instead of directly to the substrate. In such a scenario, the insulation (or cover board) may actually be mechanically-attached to the substrate first and then the roofing membrane is glued to the top of that. Let’s look at this a little more closely



• Aesthetically pleasing

• Proven system that has been installed for decades.

• No fluttering in the roof system

• Offers the best manufacturers wind ratings.

• Can be a quiet installation when paired with an olybond installation adhesives.


Fully Adhered TPO System In Renton, WA

Chase Construction NW, Inc. has been working on a commercial roofing project in Renton, WA. for an apartment complex called Heritage Hills. We determined the best roofing system for this project would be GAF’s fully adhered 60 mil TPO. Check out these before and after photos and video of us installing GAF’s fully adhered 60 mil TPO flat roofing system!

New Roofing System in Seattle, WA

TPO Roof in Seattle, WAVaughn-1-12

Chase Construction NW, Inc had the opportunity to roof an Orthodontic’s office in the heart of Seattle, WA. Dr. Greg Vaughn approached us and was looking to replace his existing asphalt roof with a new GAF Everguard® TPO 60 Mil mechanically attached roofing membrane. We were able to provide him with a free quote and complete the job in a professional and timely fashion. He was kind enough to provide us with a written testimony about his experience with working with Chase Construction NW, Inc.


“I just wanted to take the time to recognize Chase Construciton NW, Inc. for the outstanding and professional roof replacement work they performed on my commercial property.  From the onset of the project through completion, they were exceptionally professional. The on-site crew from Chase Construction NW, Inc. were efficient, polite and I especially appreciated the workmanship, responsiveness and the quality of work.  I really enjoyed working with Joel Beattie and found him to be knowledgeable, resourceful, and highly professional. He explained all my options and provided viable solutions, which were effectively carried out.   The job was completed in a timely manner, with minimal interuption for our existing tenants. I am very pleased with the outcome! 

It was a pleasure to work with Chase Construction NW, Inc. and I would not hesitate to refer friends, neighbors and co-workers to them for any roofing needs that they may have.”

Greg Vaughn

GAF Everguard TPO 60 mil Mechanically Attached Roofing System




Roofing Contractor Seattle, WA

If you are in the Puget Sound region of Washington State and are in need of roofing services contact Chase Construction North West, Inc. today. We are Master™ certified contractor through GAF. We have been providing our region with expert commercial and residential roofing services for over 13 years. We provide services in Seattle, Tacoma, Federal Way, Renton, Auburn and all of the surrounding cities.

Fill out our free estimate form or call us today at 253-445-8950. You can also visit GAF.com  and look for GAF Factory Certified Roofing Contractors in your area.