2 By 4 Roof Span Max

For sake of discussion we will assume a minimal roof snow load of 20 psf pounds per square foot and a 4 12 roof slope.

2 by 4 roof span max.

Dead load weight of structure and fixed loads 15 lbs ft 2. Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 on center. 2 are indicated below. Supporting imposed load for access and repair only.

Both n deck and 2 composite sheets are typically 24 inches wide. Joist breadth 47mm. Also available for the android os. An essential part of planning a patio roof or gazebo project is determining the number size and spacing of rafters beams and posts according to the loads they will carry.

At least 40mm. Span calculator for wood joists and rafters also available for the android os. 1 psf lb f ft 2 47 88 n m 2. For heavy loads 2x4s can span up to 5.

Dead load will be the actual weight of the roof steel and the roof purlins. N deck sheets have valleys that are three inches deep so you can apply them in longer spans. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Spacing your 2 4 shed rafters at 24 on center limits the width of your roof.

2 4 rafters can span up to 7. Maximum rafter spans for a patio roof. For heavy roofs or in. With zero load on horizontal 2x4 s what s the maximum span without zagging when 2x4 s are attached to the front and to the back of two 8 foot tall 4x4 inground cement footings posts.

Live load is weight of furniture wind snow and more. Span is clear span between supports. 2 40 2 89 3 38 3 87 4 36 2 04 2 75 3 47 4 20 4 93 5 66 floor joists flat roof joists assumptions at 400mm centers supporting permanent load excluding self weight of joists up to 50kg m2. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.

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. 20 psf x 949 1 5 psf x 12 x 949 x 11 625 2 8 x 3 0625 x 1 15 x 1 15 972 75 psi. Outdoor use all pressure treated lumber this is what i m looking to do. Live load 20 lbs ft 2 956.

For light load roofs 24 o c. 1 in 25 4 mm. 1 ft 0 3048 m.