Roof Rafter Design Calculator

This calculator helps you make the rafters of the suitable sizes required for your roofing.

Roof rafter design calculator.

Input the rafter span on the flat eave overhang and pitch of the roof. Plasterboard on the underside of the rafter. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Click the button to calculate the stock size needed for this job.

Half building width minus 1 2 ridge thickness. 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. Includes result for hip valley factor slope factor and the roof slope in degrees. This calculator is to be used as an estimating tool only.

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. Common rafter calculator rafter dimensions plumb cuts birds mouth dimensions cutting templates inch allow for ridge thickness when determining rafter run to outer wall. To calculate a gambrel roof. Rafter is a sloping beam usually wood that supports a pitched roof.

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. The top rafter tab displays a dimensioned side view of the gambrel roof top rafter. 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. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length.

See rafter run to outer wall calculator below. If you re thinking about replacing your roof with a new one you will need a roof truss calculator. This online truss calculator will determine the all in cost of your truss based on key inputs related to the pitch width and overhang of your 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.