Roof Rafter Span Lengths

Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak. This calculator is to be used as an estimating tool only. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.

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Rafter length using angle v r 2cos a rafter length using pitch v r 2 sqrt 1 p 2 where v overhang r roof span p pitch.

Roof rafter span lengths.

Area span on the flat please enter area span on the flat in foot. Before you can mark the rafter lengths and layout check the. Input the rafter span on the flat eave overhang and pitch of the roof. Determine the camber along the timbers length.

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. Mark the plumb cuts. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. 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.

Here the number is 1166 66 inches. Click the button to calculate the stock size needed for this job. With the tape measure hooked onto the top end transfer your two rafter lengths onto. Here the number is 941 86 inches.

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. Marking out the roof rafter lengths onto the timber before cutting step 1.