2 X 4 Roof Rafters

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 x 4 roof rafters.

I helped a friend build his garage s roof kinda of uncomfortable. As mentioned above a 2 4 spf shed roof rafter can span 11. I put 2 2x4 joist about. Where ceiling joists are not parallel to rafters rafter ties shall be installed.

If you live in an area that requires a shed roof rafter to support a heavy load then an spf rafter can only span 7. The rafters are 18 foot long without beams or trusses garage 28x40. Once you ve marked the lines use your pencil to draw the diagonal length on the. To cut roof rafters start by fixing the stair gauges on your framing square to the dimensions of your pitch.

Rafters are on 2 ft spacing. A rafter beam is usually larger than a 2 4 large homes may have rafters that are 2 12 or more. 1 3 of the way from each in to keep it from spreading from snow load. Will 2x4 rafters 24 inch on centre hold up my 8 x 12 shed.

If you re building rafters and aren t sure where to start when determining the length of your lumber you re in the right place our rafter stock size calculator shows you how long your rafters should be so you ll know what you need in terms of framing lumber dimensional lumber studs and more. Dead load will be the actual weight of the roof steel and the roof purlins. My shed is 8x14 built entirely with rough 2x4s. Most codes and specifications require them to be 5 feet apart or every third rafter whichever is less.

He s already got the 2x4 up for rafters and it s ready for laying plywood tomorrow. A truss on the other hand is only made up of 2x4s and is often pre fabricated in a factory. Skinned with 7 16 osb and vinyl siding. Built on 4 12 pitch roof with 1 2 ply decking and shingles.

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. Trusses use webs of 2x4s within the truss structure to support the roof. Both of these are for light roof loads. Just enter the dimensions of the roof rise and run to get started.

He says lowes told him he could use 2x4 for rafters with 1 2 inches plywood for asphalt shingles. This type of beam keeps the building from spreading. An syp rafter can span 11.