3 12 Roof Rafters

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.

3 12 roof rafters. While making roofing for your house with the roof rafters it is important to know the rafter length to make the roof. Use these two tables for roof rafters with a slope of 3 in 12 or less. If your roof pitch is in degrees use our. A pair of rafters is called a couple.

With this set of specs we are looking at a rafter length of 5 3. Enter run 14 11 1 4 this measurement will also be where your 8 12 common rafter starts 2. Here appear the numbers 12 7 1o which is the rafter length required and which represents 12 feet 7 inches and 10 12 of an inch. Spruce 1 kiln 2 grade 2 grade structural 12.

3 enter roof pitch slope. Calculate the length of your rafters we ll be building a 4 12 pitch roof with an 8 span with 1 of overhang. In home construction rafters are normally made of wood. Allow for ridge thickness when determining rafter run to outer wall.

Half building width minus 1 2 ridge thickness. Rise and run means that a 6 12. Enter pitch 12 inch 3. Nominal size spaced o c species grade 20 live load no finished ceiling s.

If your roof rises 5 for every 12 of run enter 5 as roof pitch. Building is 30 wide main roof 12 12 end cap is 8 12 1. 12 feet 7 10 12 inches. 3 12 4 12 5 12 roof pitch options 2 3 1 2 5 1 2 inch overhang 21 sizes from 8 4 to 12 20 single and double doors single top plates wall studs and roof trusses 24 inch o c.

They are written as follows. The roof rafters provide integral structural support to the roof. One of the cheapest and easiest to build. Print full scale rafter cut templates and birdsmouth templates fold template over rafter to mark or cut through.

Roof pitch is the value of roof rise over roof run using 12 as the base for roof run. This will give you rise height rafter length for 12 12 side. This total span is well within the load capacity of 2 4.