Roof Rafter Sizes
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.
Roof rafter sizes. The full version allows any size. This calculator is to be used as an estimating tool only. This is the distance between rafter centres. This calculator is to be used as an estimating tool only.
Rafter stock size calculator. Usually 400 450 or 600mm but any value can be used up to 610mm max. It is always better to have a large rafter rather than be concerned with a sagging roof. Input the rafter span on the flat eave overhang and pitch of the roof.
Rafter slope min 15 max 45 degrees. Here the number is 941 86 inches. For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2. Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak.
Input the rafter span on the flat eave overhang and pitch of the roof. Click the button to calculate the stock size needed for this job. Click the button to calculate the stock size needed for this job.