2 By 4 Roof Span Max

Joist breadth 47mm.

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 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. 1 psf lb f ft 2 47 88 n m 2. Dead load weight of structure and fixed loads 15 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. 2 4 rafters can span up to 7. 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. Dead load will be the actual weight of the roof steel and the roof purlins.

For heavy roofs or in. Live load is weight of furniture wind snow and more. Outdoor use all pressure treated lumber this is what i m looking to do. Maximum slop3 10 deg.

Maximum rafter spans for a patio roof. 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. At least 40mm. Span is clear span between supports.

The 2 composite has corrugations that are two inches deep making it useful for bonding to cement and metal for composite roofs. 1 ft 0 3048 m. Supporting imposed load for access and repair only. 2 are indicated below.

Live load 20 lbs ft 2 956. 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. For light load roofs 24 o c.

In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Span calculator for wood joists and rafters also available for the android os. N deck sheets have valleys that are three inches deep so you can apply them in longer spans. Spacing your 2 4 shed rafters at 24 on center limits the width of your roof.

1 in 25 4 mm. Use two 12 foot 2x4 s attached horizo. Both n deck and 2 composite sheets are typically 24 inches wide.