Rafter Spacing For Metal Roof

Rafter spacing is based on the width of the metal roofing panels.

Rafter spacing for metal roof.

So the space between rafters can be greater without reducing the maximum span. Do not use pressure treat wood for the purlins it will eat up the metal roofing and screws. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. 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.

A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel. Wider panels allow for greater spacing between rafters. For heavy loads 2x4s can span up to 5. For light load roofs 24 o c.

The most common measurement used for rafter spacing is either 16 or 24 inches. It is always better to have a large rafter rather than be concerned with a sagging roof. Keep it at 24. 2 4 rafters can span up to 7.

Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. You have to take the width of your roofing panel into the considerations. The same concept holds true for roof trusses. Spacing your 2 4 shed rafters at 24 on center limits the width of your roof.

Never seen anyone use 2 x 4 s always 1 x 4 s. Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 on center.