Roof Rafter Design Calculator

Includes result for hip valley factor slope factor and the roof slope in degrees.

Roof rafter design calculator. Usually 400 450 or 600mm but any value can be used up to 610mm max usually 400 450 or 600mm but any value can be used up to 610mm max are there any brittle finishes e g. This calculator helps you make the rafters of the suitable sizes required for your roofing. The top rafter tab displays a dimensioned side view of the gambrel roof top rafter. Use our online rafter length calculator to quickly compute the length of the shed roof rafter by entering the measurements of overhead length of roof span pitch or angle.

To calculate a gambrel roof. Input the rafter span on the flat eave overhang and pitch of the roof. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. Common rafter calculator rafter dimensions plumb cuts birds mouth dimensions cutting templates inch allow for ridge thickness when determining rafter run to outer wall.

See rafter run to outer wall calculator below. Half building width minus 1 2 ridge thickness. Click the button to calculate the stock size needed for this job. If you re thinking about replacing your roof with a new one you will need a roof truss calculator.

This is the distance between rafter centres. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Rafter is a sloping beam usually wood that supports a pitched roof. Using this handy online tool you will have an easy way to determine and figure out the specific rafters needed for the unique slope and dimensions of your roof.

Rafter length calculator calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Conclusions about the roof rafter length calculator the layout of your home or building will have a significant impact on the final design and slope of your roof. Custom gambrels allow complete flexibility of design with all input fields enabled and few constraints on the shape of the roof other than the lower slope must be greater than or equal to the upper slope. This calculator is to be used as an estimating tool only.