Flat Roof Build Up Detail

Warm cold and inverted.

Flat roof build up detail.

That will help you remember certain factors and details to build the best possible flat roof. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. To keep water from pooling at these inside corners tom rips 2x4s lengthwise on a 45 degree bevel with a table saw. 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.

Warm flat roof fully packed with insulation to prevent any condensation build up. There are three recognised designs of flat roof construction. On two sides the roof abuts a parapet a short wall common around flat roofs as well as a wall for the third floor. 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.

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. Given that the specially selected insulation layer is loose laid it will require ballasting to guard against wind uplift or floating in wet conditions. Flat roofs are hard to replace. Having a manual for warm flat roof construction with details and a summary of rules to follow helps.

Flat roof design guide. 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.