Roof Rafter Span Lengths

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.

Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. Before you can mark the rafter lengths and layout check the. Here the number is 941 86 inches. 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.

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. Mark the plumb cuts. Determine the camber along the timbers length. Marking out the roof rafter lengths onto the timber before cutting step 1.

Here the number is 1166 66 inches. Click the button to calculate the stock size needed for this job. Input the rafter span on the flat eave overhang and pitch of the roof. Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak.

With the tape measure hooked onto the top end transfer your two rafter lengths onto. 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.