Lean To Roof Joist Spacing

Dead load weight of structure and fixed loads 15 lbs ft 2.

Lean to roof joist spacing.

Spacing in exterior exposure. If the roof is not completely square you can decrease the space between joists but never increase the space. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts. If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.

Span calculator for wood joists and rafters also available for the. 1 psf lb f ft 2 47 88 n m 2. In other words if there is a 1 1 2 ridge board nailed into the wall and the width of the lean to is 96 then the run will be 94 1 2 96 1 1 2 94 1 2. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.

1 ft 0 3048 m. Live load is weight of furniture wind snow and more. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. 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.

Keep in mind that these figures depend on the size and spacing of joists and the overall structural loads. In other words you would space a roof joist 15 inches apart from another roof joist but never 17 inches apart. Enter this measurement into the calculator and select a roof pitch and the length of the rafter will automatically returned along with the rise.