Flat Roof Construction Details

Flat roof construction for residential.

Flat roof construction details.

A flat roof must be strong durable and stable throughout its lifetime. 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. The details so important to the various forms of flat roof construction e g. This will give additional stability to the roof structure.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. Edges junctions with walls penetrations and drainage are dealt with here in depth. It must provide adequate protection against the elements keeping the buildings structure and interior dry. Waterproof membrane to prevent water penetrating the structure and interior of the building.

A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. Main features flat roof design detail first off the flat roof design detail is an extremely basic direct and utilitarian design every single current trademark. From there the flat roof system you choose will determine the materials you apply. A classic flat roof is either almost completely level or has a very slight pitch of 3 in 12 inches or less.

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. 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. Many slope in several directions like squashed hip roofs toward scupper holes that connect to downspouts. However over the last few decades new and advanced materials have been developed.

A flat roof usually consists of the following. The flat roof design detail can go up against different style that when nitty gritty right can ooze a cutting edge feel. Although flat roofs are cheaper to build than pitched roofs they have a shorter life span. A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal.

Most flat roofs are typically not as long lasting or durable as sloped ones because the latter shed snow and rain a lot quicker. For additional stability you can also use steel joists that are built into one or both of the walls.