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.

2 by 4 roof span max.

Maximum rafter spans for a patio roof. N deck sheets have valleys that are three inches deep so you can apply them in longer spans. 1 in 25 4 mm. 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.

Span calculator for wood joists and rafters also available for the android os. Use two 12 foot 2x4 s attached horizo. 1 ft 0 3048 m. Joist breadth 47mm.

Maximum slop3 10 deg. 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. 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. Supporting imposed load for access and repair only.

For heavy roofs or in. 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. Outdoor use all pressure treated lumber this is what i m looking to do.

Also available for the android os. For light load roofs 24 o c. Dead load will be the actual weight of the roof steel and the roof purlins. For heavy loads 2x4s can span up to 5.

The 2 composite has corrugations that are two inches deep making it useful for bonding to cement and metal for composite roofs. At least 40mm. 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 weight of structure and fixed loads 15 lbs ft 2.

Spacing your 2 4 shed rafters at 24 on center limits the width of your roof. 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. Span is clear span between supports. Live load is weight of furniture wind snow and more.

2 4 rafters can span up to 7. Both n deck and 2 composite sheets are typically 24 inches wide. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.