Flat Roof Framing Terminology

As opposed to old built up felt roofing with joins new single ply waterproof membranes are now most commonly used.

Flat roof framing terminology.

What is a flat roof. Roof framing involves a lexicon all its own. Some of these can support the roof and prevent ridge sagging and wall spreading. Flat roofs are an ancient form mostly used in arid climates and allow the roof space to be used as a living space or a living roof flat roofs or low slope roofs are also commonly found on commercial.

When repairing or replacing a roof it pays to be familiar with these terms. However green building uses a single top plate and ensures that rafters and ceiling joists sit on the plate directly over the studs. 2 part of a flat roof structure that receives the ends of the flat roof joists. 3 part of a suspended timber floor construction that provides a level bearing and.

A flat roof is a roof which is almost level in contrast to the many types of sloped roofs the slope of a roof is properly known as its pitch and flat roofs have up to approximately 10. Includes illustrations that show roofs have hip rafters ridge boards jack rafters and more. You can do this with a foam layer that exactly fits your roof. Figure 2 2 roof framing terms.

When framing a flat roof you will need to create a slight incline. They are common on extensions garages and commercial buildings. 1 part of a pitched roof construction that receives the feet of the spars sp ars and ceiling joist ends. Line length is the hyptenuse of the triangle whose base equals the total run and whose altitude equals the total rise.

Sarking is a strong moisture proof reflective metallic building paper which is placed over the roof battens purlins and installed beneath the external roof covering. This article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams. If the unit of rise in inches is 3 then the cut is the unit of rise and the unit of run 12 inches or 3 12. 1 8 pitch is given so 24 x 1 8 equals 3 or unit of rise in inches.

Roof truss a frame designed to carry the loads of a roof and it s covering over the full span without intermediate support. This will help you create a flat roof framing plan. The edge of a roof which runs from eaves to ridge at a gable. Top plate or plates in conventional western platform framing there are two top plates.

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. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. Some roofs actually slope in several directions ensuring optimal water runoff. This is to help prevent deflection and sag in the roof.

Here is a closer look at common roofing terms. Sway bracing there are a few ways to sway brace the wall. Flat roofs are hard to replace. Flat roofs are always built at a slight incline at least 1 8 inch per foot.