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Calculate the length of a rafter given the width of the building, overhang, and width of the beam, if any. A rafter is a structural member that provides support for the roof sheathing and transfers the weight of the roof to the exterior walls of a building. Calculating the length of the rafters is an essential part of framing a roof.

What size Rafter do you need for 10′, 12′, 15′, 16′, 18′, 20′ & 24 foot span, depends on many factors like the type of wood species (S. Pine, Doug. Fir, Hem-fir, SPF and etc), the load they need to support, and local building codes. Common …

Rafter Span Tables - Use these tables to determine lengths, sizes, and spacing of rafters based on several factors such as species, load, grade, and spacing. 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.

Calculate rafter length using building width, overhang, ridgeboard thickness, and roof pitch. Results include rafter length in decimal and fractional feet and inches.

Roof pitch calculator - Use this calculator to calculate roof slope, roof pitch, and common rafter length.

Section R802.4 outlines the wood roof rafter framing criteria which also includes prescriptive span tables. In this post we will learn how to correctly size a roof rafter based on its span, spacing and species of wood used.

example rafter length is 12' 35%". This is ihe length from the top to the seat plumb mark. Tail Eave Length: The tail or eave overhang must be added. (See figure 4 on the next page, for a suggested eave construction.)

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With the help of this tool, you can calculate the dimensions of your roof trusses in no time. However, this tool is more than a simple rafter calculator! You can also use it to figure out the truss count for your roof and, while you're at it, quickly estimate the …