2 X 4 Roof Rafters

Most codes and specifications require them to be 5 feet apart or every third rafter whichever is less.

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. 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. 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.

An syp rafter can span 11. Built on 4 12 pitch roof with 1 2 ply decking and shingles. 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. Trusses use webs of 2x4s within the truss structure to support the roof.

A truss on the other hand is only made up of 2x4s and is often pre fabricated in a factory. 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. Skinned with 7 16 osb and vinyl siding. 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. Both of these are for light roof loads. 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. The rafters are 18 foot long without beams or trusses garage 28x40.

As mentioned above a 2 4 spf shed roof rafter can span 11. Once you ve marked the lines use your pencil to draw the diagonal length on the. Rafters are on 2 ft spacing. He says lowes told him he could use 2x4 for rafters with 1 2 inches plywood for asphalt shingles.

Just enter the dimensions of the roof rise and run to get started. I helped a friend build his garage s roof kinda of uncomfortable. A rafter beam is usually larger than a 2 4 large homes may have rafters that are 2 12 or more. Rafter ties shall be a minimum of 2 inch by 4 inch 51 mm by 102 mm nominal installed in accordance with the connection requirements in table r802 5 1 9 or connections of equivalent capacities shall be provided.

I put 2 2x4 joist about. 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.