Flat Roof Framing Terminology

However green building uses a single top plate and ensures that rafters and ceiling joists sit on the plate directly over the studs.

Flat roof framing terminology. 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. The edge of a roof which runs from eaves to ridge at a gable. When repairing or replacing a roof it pays to be familiar with these terms. 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. 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. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. Line length is the hyptenuse of the triangle whose base equals the total run and whose altitude equals the total rise.

Includes illustrations that show roofs have hip rafters ridge boards jack rafters and more. Some roofs actually slope in several directions ensuring optimal water runoff. 1 8 pitch is given so 24 x 1 8 equals 3 or unit of rise in inches. You can do this with a foam layer that exactly fits your roof.

Figure 2 2 roof framing terms. Flat roofs are an often lower cost and easier to install alternative to traditional pitched roofs. This will help you create a flat roof framing plan. 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.

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. Here is a closer look at common roofing terms.

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. Top plate or plates in conventional western platform framing there are two top plates. This could mean flat roofs may not raise the same red flags they used to. 1 part of a pitched roof construction that receives the feet of the spars sp ars and ceiling joist ends.

Flat roofs are always built at a slight incline at least 1 8 inch per foot. Roof framing involves a lexicon all its own. Some of these can support the roof and prevent ridge sagging and wall spreading. When framing a flat roof you will need to create a slight incline.

Collar ties rafter ties tension beams structural ridge beams. 3 part of a suspended timber floor construction that provides a level bearing and. As opposed to old built up felt roofing with joins new single ply waterproof membranes are now most commonly used. Flat roofs are hard to replace.