2 By 4 Roof Span Max

Maximum rafter spans for a patio roof.

2 by 4 roof span max.

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. Joist breadth 47mm. 1 psf lb f ft 2 47 88 n m 2. The 2 composite has corrugations that are two inches deep making it useful for bonding to cement and metal for composite roofs.

Supporting imposed load for access and repair only. Span is clear span between supports. Span calculator for wood joists and rafters also available for the android os. At least 40mm.

Live load is weight of furniture wind snow and more. Use two 12 foot 2x4 s attached horizo. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Both n deck and 2 composite sheets are typically 24 inches wide.

Also available for the android os. 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. 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.

Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. For heavy loads 2x4s can span up to 5. Dead load weight of structure and fixed loads 15 lbs ft 2. Maximum slop3 10 deg.

For heavy roofs or in. 2 are indicated below. 1 ft 0 3048 m. Live load 20 lbs ft 2 956.

For light load roofs 24 o c. 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. 2 4 rafters can span up to 7. Spacing your 2 4 shed rafters at 24 on center limits the width of your roof.

1 in 25 4 mm. 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. Outdoor use all pressure treated lumber this is what i m looking to do.