What Ply To Use On A Flat Roof

The minimum plywood for roofing.

What ply to use on a flat roof.

Look for something that s graded as exposure 1 or exterior. Known technically as elastomeric or plastomeric roof membrane depending on the material single ply roofs come in a few different varieties including. Common flat roof membranes discussed in this article include built up asphalt tar and gravel modified bitumen and single ply membranes like epdm pvc tpo and kee. Tpo is 1 70 per sq foot.

Single ply roofing has become an increasingly popular flat roof covering over the last few years. The membrane roof is the latest roofing technology and is also the roof of choice in commercial construction. We also cover spray applied foam and liquid roofing options. Essentially a single ply membrane roof is comprised of flexible sheets of synthetic polymer that can be divided into two main groups thermoplastics and synthetic rubber.

In addition to the thickness you also need to make sure that you choose plywood that s graded for outdoor use. Why is plywood used in roofing. Rafters run from the peak of the roof. In general materials used on flat roofs cost less than ones used on sloped ones.

Pros and cons for flat roof materials. Membrane roofing is often used on commercial flat roofs. Epdm is 1 50 per sq foot making it the cheapest single ply membrane. Although the roof structure takes the majority of the weight plywood needs to be able to support the rest of the roofing system.

What plywood should you use for a roof. It is formed from multiple layers of wood bonded together with a glue and the grains run in alternate directions through each layer which ensures the board s strength is. You can use our flat roof calculator to quickly and accurately estimate the cost of replacement. Pvc is 1 90 per sq foot.

Flat roofs usually come with a 10 to 20 year warranty but can last 25 years if you build the roofs right and maintain them using commonsense rules. Osb and plywood come in thicknesses ranging from 5 16 to 3 4 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load and roof design. In roofing plywood is often selected due to its strength. What size plywood should you use for your roof.

All three types of flat roofing cost 250 to 350 per square 100 square feet but prices vary according to region and size of the roof.