Rafter Size For 3 12 Roof

Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement.

Rafter size for 3 12 roof. Shed roof 2 12 slope. Rafter is a sloping beam usually wood that supports a pitched roof. Click the button to calculate the stock size needed for this job. 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.

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. Snow load 2x6 rafters 16 centers garage 17 long 11 read more. It is one of a series of sloped structural members that extend from the ridge or hip to the wall plate designed to support the. Input the rafter span on the flat eave overhang and pitch of the roof.

Here the number is 941 86 inches. This calculator helps you make the rafters of the suitable sizes required for your roofing. Click to add item 24 spreadweb residential roof truss 5 12 pitch 87 to the compare list compare click to add item 24 spreadweb residential roof truss 5 12 pitch 87 to the compare list add to list click to add item 24 spreadweb residential roof truss 5 12 pitch 87 to your list. Depending on the size of your structure you will need to cut several or many more.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Includes result for hip valley factor slope factor and the roof slope in degrees. Just enter the dimensions of the roof rise and run to get started. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length.

If you re building rafters and aren t sure where to start when determining the length of your lumber you re in the right place our rafter stock size calculator shows you how long your rafters should be so you ll know what you need in terms of framing lumber dimensional lumber studs and more. All roof rafters should be identical so follow the same steps to measure the plumb cut tail cut and birdsmouth cut. There could be many rafters supporting a roof. Rafter run outer wall this should be measured starting from the center of the roof span and then extending to the very edge of the exterior wall.

Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter. Repeat the process for your other 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. At this point you ve cut 1 roof rafter.

This calculator is to be used as an estimating tool only.