2 X 4 Roof Rafters

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2 x 4 roof rafters.

Built on 4 12 pitch roof with 1 2 ply decking and shingles. Skinned with 7 16 osb and vinyl siding. He says lowes told him he could use 2x4 for rafters with 1 2 inches plywood for asphalt shingles. The rafters are 18 foot long without beams or trusses garage 28x40.

Trusses use webs of 2x4s within the truss structure to support the roof. 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. Just enter the dimensions of the roof rise and run to get started. As mentioned above a 2 4 spf shed roof rafter can span 11.

A truss on the other hand is only made up of 2x4s and is often pre fabricated in a factory. An syp rafter can span 11. Rafters are on 2 ft spacing. 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.

Dead load will be the actual weight of the roof steel and the roof purlins. I put 2 2x4 joist about. This type of beam keeps the building from spreading. My shed is 8x14 built entirely with rough 2x4s.

I helped a friend build his garage s roof kinda of uncomfortable. A collar tie or beam figure 7 7 is a piece of stock usually 1 x 4 1 x 6 l x 8 or 2 x 4 fastened in a horizontal position to a pair of rafters between the plate and the ridge of the roof. Both of these are for light roof loads. Will 2x4 rafters 24 inch on centre hold up my 8 x 12 shed.

To cut roof rafters start by fixing the stair gauges on your framing square to the dimensions of your pitch. He s already got the 2x4 up for rafters and it s ready for laying plywood tomorrow. Once you ve marked the lines use your pencil to draw the diagonal length on the. A rafter beam is usually larger than a 2 4 large homes may have rafters that are 2 12 or more.

Next set the framing square on top of the rafter beam and use a pencil to trace the outside edge of the framing square s tongue. 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. Most codes and specifications require them to be 5 feet apart or every third rafter whichever is less.