A roof joist is always spaced no more than 16 inches apart from another roof joist.
Roof joist spacing shed.
The smallest beams for patio covers are typically 4 by 6.
2 8 s come standard at 1 inch thick.
For heavy loads 2x4s can span up to 5.
2x8s are used frequently for these projects.
Although the standard spacing of roof trusses may be the same as that of rafters with 24 inch spacing being a common option the design of a truss may allow for the use of a lower grade of lumber than would be required for rafters with comparable spacing and span.
A 4 by 10 can usually span up to 12 feet between posts.
For instance 2 grade 2x4s at 16 on center will span just over 9.
Skillion shed style roof framing.
For light load roofs 24 o c.
Two options that arise could be your wider 24 and your narrower 12 options for spacing.
Spacing your 2 4 shed rafters at 24 on center limits the width of your roof.
In many circumstances 16 inches would be your standard spacing for shed floor joist but this is just a rough guideline.
In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.
If the roof is not completely square you can decrease the space between joists but never increase the space.
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.
There is no standard spacing it depends on what size of rafters you want to use and the span of your shed.
The third option is to build a normal sized shed.
2 4 rafters can span up to 7.
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.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
Metal roofs and pole buildings.
In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
Typically spacing the studs of a normal sized shed at 24 inches will meet county and municipal codes.
The lower the roof the lower the ceiling you have to deal with when you are inside the shed.
If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.
The figures are based on quality materials.
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.
Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 on center.
