There is no standard spacing it depends on what size of rafters you want to use and the span of your shed.
Rafter spacing for metal roof shed.
Use these two tables for roof rafters with a slope of 3 in 12 or less.
For light load roofs 24 o c.
Rafter spacing is based on the width of the metal roofing panels.
This is most likely the standard size that you will find on pre made roof trusses.
Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
If you get premium kiln dried lumber then you could span 10 5 with the same size of lumber and rafter spacing.
So the space between rafters can be greater without reducing the maximum span.
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.
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.
Common spacing for trusses on this type of building is often between 2 and 4 feet but trusses built with advanced designs may allow spacing as great as 8 or 12 feet.
Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof line.
Install the roofing screws vertically along each rib in the panel.
For instance 2 grade 2x4s at 16 on center will span just over 9.
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 same concept holds true for roof trusses.
For heavy loads 2x4s can span up to 5.
A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel.
As most building these days are using those pre made trusses on the roof 24 inches become the main size for any roofing construction when it comes to its truss installation.
Be sure the larger edge is laid so that the small edge of the next panel will overlap it.
2 4 rafters can span up to 7.
Typical standard the typical standard for the spacing on the roof trusses is 24 inches.
Twenty four inches is a common spacing of furring strips for a metal roof.
Correctly measure the spacing of furring strips for a metal roof to further decrease condensation.
An essential part of planning a patio roof or gazebo project is determining the number size and spacing of rafters beams and posts according to the loads they will carry.
