The width of metal panels will determine the rafter spacing.
Rafter spacing for metal roof.
Other relevant factors include the type of wood being used for the rafters the size of the rafters and the load that the rafters need to support.
For heavy loads 2x4s can span up to 5.
Correctly measure the spacing of furring strips for a metal roof to further decrease condensation.
Wider panels allow for greater spacing between rafters.
A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel.
The metal roof purlins spacing must be done correctly within narrow tolerances.
There is a chance of damaging roofing sheets if you are failed to do so.
The wider the roofing panels the greater spacing distance you should put.
2 4 rafters can span up to 7.
Rafter spacing is based on the width of the metal roofing panels.
Rafter spacing for metal roof purlin hangers clips are available if you would rather the purlin be on the same level as the rafter rather than on top of the rafter.
The spacing between rafters in a given building is part of the engineering calculations that determine the required structure of the roof.