Dead load weight of structure and fixed loads 15 lbs ft 2.
2 by 4 roof span max.
For heavy roofs or in.
Live load 20 lbs ft 2 956.
1 in 25 4 mm.
Span is clear span between supports.
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.
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.
For light load roofs 24 o c.
Live load is weight of furniture wind snow and more.
Both n deck and 2 composite sheets are typically 24 inches wide.
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.
Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 on center.
The 2 composite has corrugations that are two inches deep making it useful for bonding to cement and metal for composite roofs.
Spacing your 2 4 shed rafters at 24 on center limits the width of your roof.
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.
Supporting imposed load for access and repair only.
1 ft 0 3048 m.
Outdoor use all pressure treated lumber this is what i m looking to do.
Also available for the android os.
1 psf lb f ft 2 47 88 n m 2.
Dead load will be the actual weight of the roof steel and the roof purlins.
For heavy loads 2x4s can span up to 5.
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.
Maximum rafter spans for a patio roof.
Span calculator for wood joists and rafters also available for the android os.
Use two 12 foot 2x4 s attached horizo.
Maximum slop3 10 deg.
Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.
2 4 rafters can span up to 7.
Joist breadth 47mm.
2 are indicated below.
N deck sheets have valleys that are three inches deep so you can apply them in longer spans.
