Shed Roof Joist Size

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.

Shed roof joist size.

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. This is based upon the span of the rafter horizontal span not total rafter length live and dead loads. Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 on center. 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.

2x8s are used frequently for these projects. In many circumstances 16 inches would be your standard spacing for shed floor joist but this is just a rough guideline. To size joists and rafters use the maximum span tables for southern yellow pine. For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2.

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. For light load roofs 24 o c. Rafter and joist span faq. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

This is the distance between joist centres. For heavy loads 2x4s can span up to 5. The fact that they are 2x4 will mean that the timber will become curved within 2 years from the weight. This rafter span calculator is species specific for douglas fir hemlock etc.

This is due to the fact that the timber is 5mts long. Spacing your 2 4 shed rafters at 24 on center limits the width of your roof. Hi there the 47mm x 67mm mini joist hangers are no issue if they are put in an accurate and stable manner. 2 4 rafters can span up to 7.

However the timber sizes you have opted for will prove to be an issue. 2 8 s come standard at 1 inch thick. 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. Trying to find what size lumber to use.