Roofing Using 2x4

2x4 x8 feet boards.

Roofing using 2x4.

Rafters are on 2 ft spacing. For this example a section of roof is 20 feet wide. Access the roof using an extension ladder. 60 pieces 2x4 x12 feet boards.

If you have a simple gable shed roof then using 2 4 rafters makes more sense unless you have a very large shed. 2 pieces 2x4 x10 feet boards pressure treated. The most common roofing materials used in the united states include shingles membrane roofing and ceramic tile all of which have different life spans. Roof will be roughly 12 x 16.

5 pieces 2x4 x12 feet boards pressure treated. Rafters to 2x4 with joist hangers. Built on 4 12 pitch roof with 1 2 ply decking and shingles. It s made 11 winters here and look like the day i finished it.

Measure each section of the roof from side to side parallel to the line of the fascia board. Without even running the calculations i would say there is a good chance the 2 4 purlins will not make the deflection criteria required for a roof framing member supporting steel. For roofs that will experience heavy snow or wind and will span the same distance use 2 6 rafters. In bending 2 4 2 purlins would work at 12 on center however i personally would not want to walk on top of them.

Using the aggregate area of these simple shapes can yield a more accurate roof area to be used with the roofing material calculator. The width of metal panels will determine the rafter spacing. 2 pieces 12 feet aluminum. One foot overhang so could say 11x16.

A rough 2x4 had a lot more strength that a finished one. The wider the roofing panels the greater spacing distance you should put. There is a chance of damaging roofing sheets if you are failed to do so. The metal roof purlins spacing must be done correctly within narrow tolerances.

For roofs that won t experience heavy snow loads a gable roof can span up to 22 with 2 4 rafters. 1 3 of the way from each in to keep it from spreading from snow load.