How To Roof Rafters

For instance 2 grade 2x4s at 16 on center will span just over 9.

How to roof rafters.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. If you re framing a gable roof on a new house or building a shed or even a doghouse with a gable roof you ll need to cut a number of roof rafters. There is no standard spacing it depends on what size of rafters you want to use and the span of your shed. The ridge end of the rafter and often the eve end will need to be cut to the angle of the roof slope.

Framing a roof is the last step in framing new construction. The roof on this shed is a 4 in 12 slope which makes it a 18 and. The roof rafters provide integral structural support to 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.

In finished space insulation is placed between the rafter boards and drywall or other material is fastened to the face. Includes result for hip valley factor slope factor and the roof slope in degrees. For standard shed roof rafter spacing see rafter span chart. While most home builders will outsource the construction of roofing trusses the rafter supports of the roof itself learning to frame a roof yourself is one of the true arts of carpentry and a basic primer is covered below.

Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. 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. 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. 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.