Flat Roof Types

Valentine Roofing truly specializes in installing flat and low slope roofing systems. Simply put, we are the flat roofing experts! Flat roofs are really nothing like regular pitched roofs. The materials are different and the skill sets are different. There are very few Seattle roofing companies that have any business installing a flat roof. Valentine Roofing has specially trained crews that install hundreds of Seattle area flat roofs each year. We provide mandatory, in-house training for all our flat roof crews. We also host representatives from flat roofing material manufacturers, such as Weatherbond to come to our warehouse and train our roofers and project managers on the latest flat roofing tips and technologies. No Seattle roofing company installs a better flat roof than Valentine Roofing.

PVC Roofing

PVC (Polyvinyl Chloride) is hands down the best flat roofing material on the market today. PVC roofs keep their flexibility over time, which is the key. As soon as a flat roof becomes rigid, it will crack and leak. Flat roofs are very unforgiving and can leak with even the slightest cracking. PVC roofing is engineered to be supple, strong and reflect UV rays that break down flat roofs. The flexibility of PVC roofing also makes it easier for roofers to install the product around roof penetrations like vents, chimneys and skylights. PVC flat roofs can easily last more than 20 years. Valentine Roofing installs more PVC flat roofs, here in Seattle than any other flat roofing product.

TPO Roofing

TPO (Thermoplastic Polyolefin) is a single ply flat roofing material that is highly resistant to tears, impacts, and punctures. TPO flat roofs also offer good flexibility which is very important to seasonal temperature changes in Seattle. TPO is also known as a very heat-reflective and cool roof particularly in the color white. Each seam is heat welded which essentially creates one solid, seamless roof as the finished product. Because of its relatively low cost, durability and long life span, (over 15 years) TPO is a very popular choice for Seattle roofing contractors. As such, Valentine Roofing proudly installs TPO flat roofs.

Torch Down Roofing

As the name suggests, torchdown roofing (Modified Bitumen) is laid down with an open flame or “torch”. For this reason, torchdown roofing is sometimes called torch applied roofing. The torch used is basically a mini flamethrower that melts the layers of torchdown roofing together. Not too long ago, torchdown was widely used as a viable flat roofing option here in Seattle. More recently, it is becoming more obsolete due to better products being introduced into the marketplace and the high insurance premiums needed for roofers to install it (many buildings have burned down during installations). For these reasons Valentine Roofing recommends other flat roofing products such as PVC or TPO.

Hot Tar Roofing

Hot tar is another roofing product similar to torch down. In traditional Hot Tar roofing, the tar is melted in a tar kettle, poured into a large bucket and then applied to the tar paper with a mop. The roofing product used with the hot tar is basically like the torch down material. The difference is that with the torch down, the tar is in the material already. With hot tar, the tar is mopped on during the installation. Both types of flat roofs usually last 10 years, which is a short life span for flat roofs. Over time, hot tar roofing is becoming more obsolete in the Seattle residential roofing market. Valentine Roofing recommends PVC and TPO.

EPDM Roofing

EPDM (Ethylene Propylene Diene Monomer) is basically a rubber roof. This product is most popular in the Northeast part of the country and isn’t a very common residential flat roof in Seattle. If installed correctly, an EPDM roof can last 10-20 years. However this is a very big “if”. EPDM roofing relies on adhesives or bonding agents to keep each seam of overlapping roofing from leaking. If the bonding agent isn’t applied just right, you will have a leaky roof. There is also a common problem with bubbling when the EPDM roofing isn’t laid flat enough. Because EPDM roofing material is cheap and easy to purchase and doesn’t require specialized equipment to install, many roofers try their luck at this product and unsuccessfully so. The bottom line is: There are better flat roofing options out there than EPDM. PVC and TPO are recommended.

Product Comparison

Valentine Roofing only installs PVC and TPO flat roofs.

Roofing Material Best Warranty Most Sustainable Heat Reflective Ease of Maintenance Fire Resistant




Torch Down


Hot Tar




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