Shed Roof Joist Size

Rafter and joist span faq.

Shed roof joist size.

Two options that arise could be your wider 24 and your narrower 12 options for spacing. This is due to the fact that the timber is 5mts long. Usually 400 450 or 600mm but any value can be used up to 610mm max usually 400 450 or 600mm but any value can be used up to 610mm max 1 2 timber strength class and joist size. To size joists and rafters use the maximum span tables for southern yellow pine.

Hi there the 47mm x 67mm mini joist hangers are no issue if they are put in an accurate and stable manner. However the timber sizes you have opted for will prove to be an issue. For heavy loads 2x4s can span up to 5. For light load roofs 24 o c.

More roof calculators roof truss calculator. 2x8s are used frequently for these projects. The fact that they are 2x4 will mean that the timber will become curved within 2 years from the weight. Trying to find what size lumber to use.

In other words if there is a 1 1 2 ridge board nailed into the wall and the width of the lean to is 96 then the run will be 94 1 2 96 1 1 2 94 1 2. 2 8 s come standard at 1 inch thick. Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 on center. This rafter span calculator is species specific for douglas fir hemlock etc.

This is based upon the span of the rafter horizontal span not total rafter length live and dead loads. The run for a lean to shed rafter ending into a wall should account for the ridge board nailed into the wall where the tops of the rafters rest into. Spacing your 2 4 shed rafters at 24 on center limits the width of your roof. As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.

2 4 rafters can span up to 7. In many circumstances 16 inches would be your standard spacing for shed floor joist but this is just a rough guideline. For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. This is the distance between joist centres.