How Make Roof Rafter

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.

How make roof rafter. The pitch and span of your roof will dictate how long of a rafter you ll need use maximum span calculator to help you find your rafter size. In finished space insulation is placed between the rafter boards and drywall or other material is fastened to the face. This video shows how to make roof rafters with a rafter square and or a speed squ. The use of a truss or rafter calculator will provide more accurate results.

When you cut the rafters you ll need to make 3 separate cuts. The first step in building the roof rafters is to cut one rafter board to length with the ends angled properly and then to mark and cut the birds mouth and seat on the rafter. If you look at the rafter span chart you ll notice that 2x4s can be used for rafters on spans up to 11. Today we are tackling a big beginner lesson which is common rafter layout and cutting.

This marks the notch or bird s mouth cut of the rafter which rests on top of the exterior wall. There are two choices when it comes to the support system you ll use for the roof of a construction project. The good thing about roof trusses is that they are simple to construct. The roof on this shed is a 4 in 12 slope which makes it a 18 and.

Measure from the bottom end of the plumb cut line marked in step 5 and make a mark at 2 inches. Begin by determining the measurements of the roof s slope. Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall. Trusses are costlier and need to be engineered.

The boards creating the slope of the roof are wider than lumber used to build trusses 2x8s 2x10s and 2x12s are most common in rafters vs. From this measurement mark a line square to the plumb cut line to the bottom edge of the rafter. Rafters are simpler and can be done on site. The longer your shed is the more roof trusses you will have to make.

The ridge end of the rafter and often the eve end will need to be cut to the angle of the roof slope. Common rafters are the most common type of rafter in construction. The ridge cut also called the plumb cut at the top of the rafter the birdsmouth cut which itself comprises 2 different cuts where the rafter meets the building s wall and the tail cut at the base of the rafter.