Gaf Torchdown Overtop An Existing One Layer Roof

The membrane is available with a smooth surface.

Gaf torchdown overtop an existing one layer roof.

Select system constructions available with up to 20 year guarantee coverage 1. Torch down roofs are composed of two or more layers of a modified asphalt membrane applied with an open flame torch. Advantages of three layer torch down roofing. Its core is a strong resilient non woven polyester mat that is coated with weather resistant app polymer modified asphalt.

What is a torchdown roofing system. How to install a roof over an existing roof. Single ply membranes such as pvc epdm tpo or torchdown also known modified bitumen are the most common low slope and flat roofing materials. There are two different types of torch down roofing systems.

Two layer torch down roofing may cost less. This provides added protection against ice dams. The installed cost of ruberoid torch granule membrane is less than most single ply systems on the market today. Three layer systems have a base a smooth torch down layer and a torch down layer with a granular surface.

Installed roof designs weigh less than 2 pounds per square foot ruberoid torch granule membrane polyester mat core allows it to resist splits. Plus learn the advantages and disadvantages of a torch down roof system. Typical system guarantees available for up to 15 years. There are many choices and material types you can use on your flat roofing system in seattle.

Two layer and three layer torch down roof systems. Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin. A two layer torch down roof consists of one base sheet and one smooth cap sheet. Depending on your roofing systems design one of these membranes might be a better choice than the other.

Two layer systems tend to last approximately 15 years while three layer torch down roofing can last 20 years or longer. Ruberoid torch smooth membrane is backed by gaf a company with over 130 years in the roofing business. A three layer torch down roof features the same base and cap sheets as well as an additional cap sheet with a granulated surface. A two layer system is made up of one base layer and one torch down layer.

Discover the various components of a torch down roof and the materials used to manufacture it. Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option.