Flat Roof Build Up Detail

Learn about the variety of installation methods and roofing system options including bur built up roof sbs and app.

Flat roof build up detail.

Back to flat roof construction. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. In the case of a flat roof insulation is usually in the form of either a rigid board above the deck or a fibrous quilt immediately above the ceiling depending on the type of roof construction. A further benefit of this type of flat roof build up is that the waterproofing layer is hidden and thereby protected from the effects of solar gain.

Flat roof types. One special type of built up roofing called ballasted roofing uses large stones about 1 1 2 to 2 1 2 inches in diameter for the surface layer. Warm cold and inverted. This could mean flat roofs may not raise the same red flags they used to.

With a ballasted system the lower layers are not adhered or fastened to the roof structure and the heavy surface layer keeps the roofing in place. To keep water from pooling at these inside corners tom rips 2x4s lengthwise on a 45 degree bevel with a table saw. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. Having a manual for warm flat roof construction with details and a summary of rules to follow helps.

Where insulation above the roof void allows the air underneath to stay warm avoiding condensation but also allows for an air flow should one be deemed to be required through the joists. It must provide adequate protection against the elements keeping the buildings structure and interior dry. On two sides the roof abuts a parapet a short wall common around flat roofs as well as a wall for the third floor. Standard details product support single ply build up videos declarations of performance product datasheets safety datasheet.

There are three recognised designs of flat roof construction. A flat roof must be strong durable and stable throughout its lifetime. Asphalt is one of the oldest roofing technologies still in use today and it is a reliable solution for both residential and commercial roofing needs. Here the rubber roof will need to run up the walls and glue to the sheathing.

That will help you remember certain factors and details to build the best possible flat roof. Given that the specially selected insulation layer is loose laid it will require ballasting to guard against wind uplift or floating in wet conditions. A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. Some observers suggest it s harder to replace a flat roof than a traditional pitched shingle roof because of the labor required to remove its layers especially on older flat roofs.

Flat roofs are hard to replace.