Typical Flat Roof Build Up

The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure.

Typical flat roof build up. On a basic level flat roof construction comes in the form of roofing timbers or joists as they are more commonly known or steels that are laid across two uprights walls in most cases. This may make it less ideal for rainy or snowy climates. As the roof is installed more and more layers are added to increase durability and longevity hence the name built up. The recognised flat roof build ups for best design practices are.

Built up roofing also called bur is the most common roofing material used on low slope roofs. Tar and gravel 2. In the case of a flat roof insulation is usually either a rigid board above the deck or a mineral glass wool quilt immediately above the underdrawn ceiling depending on the type of roof design and construction. Also known as low slope roofs flat roofs are less common in north american residential construction because the low slope of a flat roof has an increased tendency to collect water rather than shed like its more steeply pitched alternative.

Built up roofs are manufactured using built up layers of either tar saturated paper and liquid tar with gravel asphalt rolled asphalt or modified bitumen. The most important thing to know about a flat roof says tom is that it s not flat to prevent water from pooling and eventually invading the home flat roofs are always built on a slight incline at least 1 8 inch per foot.