How Do I Cut Roof Raqfters

The ridge cut also called the plumb cut at the top of the rafter the birdsmouth cut.

How do i cut roof raqfters.

Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof. 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. Hopefully after reading this guide you see how easy it is to cut rafters once you get the hang of it. The roof on this shed is a 4 in 12 slope which makes it a 18 and.

One thing that i can t stress enough be sure that your measurements are rock solid before you mark or cut anything. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter. In this video you will learn all about common rafters.

If you look at the rafter span chart you ll notice that 2x4s can be used for rafters on spans up to 11. Birdsmouth joints cut into roofing rafters and mounted in place on top of the wall plate. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. How to measure or figure rafter length and mark and cut them accurately.

The ridge end of the rafter and often the eve end will need to be cut to the angle of the roof slope. When you cut the rafters you ll need to make 3 separate cuts. If is wasn t for this joint a rafter or roofing joist would only balance on top of the wall plate making fixing difficult not to mention the fact that there wouldn t be any solid connection between the roof and the supporting walls below. The roof rafters provide integral structural support to the roof.