A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel.
Rafter spacing for metal roof shed.
2 4 rafters can span up to 7.
Twenty four inches is a common spacing of furring strips for a metal roof.
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.
Use these two tables for roof rafters with a slope of 3 in 12 or less.
This is most likely the standard size that you will find on pre made roof trusses.
For heavy loads 2x4s can span up to 5.
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.
For standard shed roof rafter spacing see rafter span chart.
Be sure the larger edge is laid so that the small edge of the next panel will overlap it.
If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.
The same concept holds true for roof trusses.
Install the roofing screws vertically along each rib in the panel.
Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 on center.
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.
Wider panels allow for greater spacing between rafters.
Rafter spacing is based on the width of the metal roofing panels.
For instance 2 grade 2x4s at 16 on center will span just over 9.
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.
There is no standard spacing it depends on what size of rafters you want to use and the span of your shed.
For light load roofs 24 o c.
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.
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.
If you get premium kiln dried lumber then you could span 10 5 with the same size of lumber and rafter spacing.
Correctly measure the spacing of furring strips for a metal roof to further decrease condensation.
