Roof Joist Spacing Shed

If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.

Roof joist spacing shed.

For instance 2 grade 2x4s at 16 on center will span just over 9. Metal roofs and pole buildings. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. A 4 by 10 can usually span up to 12 feet between posts.

2 4 rafters can span up to 7. If you plan to have eaves to protect the shed walls make sure you add the extra length when measuring the rafters. Spacing your 2 4 shed rafters at 24 on center limits the width of your roof. A roof joist is always spaced no more than 16 inches apart from another roof joist.

In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts. The tables below give maximum spans for rafters and beams. In other words you would space a roof joist 15 inches apart from another roof joist but never 17 inches apart. 2 8 s come standard at 1 inch thick.

2x8s are used frequently for these projects. The smallest beams for patio covers are typically 4 by 6. For light load roofs 24 o c. If the roof is not completely square you can decrease the space between joists but never increase the space.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. The lower the roof the lower the ceiling you have to deal with when you are inside the shed. The skillion and shed style roofs are framed with a single slope 2 4 or 2 6 or thicker rafters spanning from the low wall to the high wall. Typically spacing the studs of a normal sized shed at 24 inches will meet county and municipal codes.

Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 on center. You can increase the number of studs but again that means higher shed stud materials costs. The figures are based on quality materials. For heavy loads 2x4s can span up to 5.

In many circumstances 16 inches would be your standard spacing for shed floor joist but this is just a rough guideline. Skillion shed style roof framing. If you get premium kiln dried lumber then you could span 10 5 with the same size of lumber and rafter spacing. 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.

The third option is to build a normal sized shed.