Flat Roof Framing Terminology

Collar ties rafter ties tension beams structural ridge beams.

Flat roof framing terminology. Roof framing involves a lexicon all its own. Top plate or plates in conventional western platform framing there are two top plates. Flat roofs are an often lower cost and easier to install alternative to traditional pitched roofs. 3 part of a suspended timber floor construction that provides a level bearing and.

Figure 2 2 roof framing terms. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. Flat roofs are always built at a slight incline at least 1 8 inch per foot. They are common on extensions garages and commercial buildings.

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. 1 8 pitch is given so 24 x 1 8 equals 3 or unit of rise in inches. As opposed to old built up felt roofing with joins new single ply waterproof membranes are now most commonly used. When repairing or replacing a roof it pays to be familiar with these terms.

This could mean flat roofs may not raise the same red flags they used to. 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. 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. This is to help prevent deflection and sag in the roof.

Here is a closer look at common roofing terms. However green building uses a single top plate and ensures that rafters and ceiling joists sit on the plate directly over the studs. Includes illustrations that show roofs have hip rafters ridge boards jack rafters and more. Line length is the hyptenuse of the triangle whose base equals the total run and whose altitude equals the total rise.

The edge of a roof which runs from eaves to ridge at a gable. You can do this with a foam layer that exactly fits your roof. Sway bracing there are a few ways to sway brace the wall. Roof truss a frame designed to carry the loads of a roof and it s covering over the full span without intermediate support.

What is a flat roof. 1 part of a pitched roof construction that receives the feet of the spars sp ars and ceiling joist ends. Some of these can support the roof and prevent ridge sagging and wall spreading. 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.

Some roofs actually slope in several directions ensuring optimal water runoff. 2 part of a flat roof structure that receives the ends of the flat roof joists. This will help you create a flat roof framing plan. When framing a flat roof you will need to create a slight incline.