Falt Roof System

Just enough slope to drain water but also flat enough to be a problem if not constructed properly.

Falt roof system.

Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot. Wind uplift is a primary concern when installing a retrofit single ply roof system rsprs over a structural metal panel roof. Flat roofing is not actually flat. Keep in mind a roofing membrane as a base to the system is vitally important to maintaining the roof s integrity and water tightness.

It has a very low slope between 1 4 to 1 2 inch per foot so that it drains water. The material usually organic felt or fiberglass felt is saturated in asphalt and rolled onto the roof s surface. Pros and cons for flat roof materials 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. Material from which this system is comprised gets its name from some of the material used and the way it is applied to the roof it covers.

But such a low slope holds snow and water much longer than a steeply pitched roof and therefore needs a very different material to stay watertight. The most common of the flat roof systems are the five described below. From there the flat roof system you choose will determine the materials you apply. 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.

These roofs have living plants that are typically installed in tray systems on the top of the flat roof surface. Underneath the basics flat roofs are usually constructed with a ceiling nailed to joists which support a deck usually wood in residential construction a vapor barrier insulation and a roof board. Astm e 1592 physical testing was performed on three test roof assemblies in order to determine the wind uplift resistance of an rsprs installed over existing structural metal panel roof systems fastened directly into purlins.