Roof Rafter Design Calculator

The top rafter tab displays a dimensioned side view of the gambrel roof top rafter.

Roof rafter design calculator.

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 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. Input the rafter span on the flat eave overhang and pitch of the roof. See rafter run to outer wall calculator below.

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. Click the button to calculate the stock size needed for this job. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Common rafter calculator rafter dimensions plumb cuts birds mouth dimensions cutting templates inch allow for ridge thickness when determining rafter run to outer wall.

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. Plasterboard on the underside of the rafter. Half building width minus 1 2 ridge thickness. 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.

This calculator helps you make the rafters of the suitable sizes required for your roofing. 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. Rafter is a sloping beam usually wood that supports a pitched roof.

This calculator is to be used as an estimating tool only. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. To calculate a gambrel roof. 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.