Roof Rafter Plans

This is our ultimate roof rafter guide for people designing and building an off grid cabin or tiny home.

Roof rafter plans.

Follow the instructions on that page to quickly find the plan number. Cut the first rafter tail. 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. 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.

Calculate the length of your rafters. 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. Truss rafter 26 ft shed roof 26 pdf 7 5 ft spacing 3 12 slope. Learn the 1 rafter design that will guarantee your roof that is safe and strong for years to come.

This agricultural building plan is a download plan that is pdf file format. After you determine the rise span run line length and pitch the next step is to lay out the rafters or mark the cuts on a pattern rafter to create the roof. Rafter spans for southern yellow pine douglas fir and eastern spruce. This article will discuss a gable roof without valleys or dormers because it s the most common and the easiest for a first time builder to tackle.

This measurement can be found on the rafter plans. Continuing on from part 3. We ll be building a 4 12 pitch roof with an 8 span with 1 of overhang. Allow for ridge thickness when determining rafter run to outer wall.

The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. Print full scale rafter cut templates and birdsmouth templates fold template over rafter to mark or cut through. Here we have a wood framed gable roof. Let s consider a basic gable wood roof framing design.

How to build shed roof rafters step 1. Discover the pros and cons to multiple roof designs. Mark and cut the first rafter ends. The ridge end of the rafter and often the eve end will need to be cut to.

This plan number is 5855. Half building width minus 1 2 ridge thickness. Mark and cut the seat and birdsmouth. Truss rafter 30 ft shed roof pdf 7 5 ft spacing 3 12 slope.

The ridge end of the rafter and often the eve end will need to be cut to the angle of the roof slope. Make a set of. First you ll want to find the pitch of your rafters which will help you find the. This plan number is 5921.

See rafter run to outer wall calculator below. Effective run is the run span 2 minus the ridge deduction usually the ridge board 2 and is the dim used to calculate the rafter length. The most basic thing a roof cutter needs to know and understand is a rafter length is simply the hypotenuse of a right triangle and the er is the base of the triangle.