Rafter Spacing For Metal Roof

For heavy loads 2x4s can span up to 5.

Rafter spacing for metal roof. 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. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

For light load roofs 24 o c. So the space between rafters can be greater without reducing the maximum span. Screw line spacing for metal roofing over metal purlins this will depend upon the type of panel that is used and the thickness of the steel.

Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 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. Do not use pressure treat wood for the purlins it will eat up the metal roofing and screws.

It is always better to have a large rafter rather than be concerned with a sagging roof. Never seen anyone use 2 x 4 s always 1 x 4 s. 2 4 rafters can span up to 7.

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. Keep it at 24. A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel.

Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. Determining rafter s spacing is as important as setting the metal roof purlins spacing. You have to take the width of your roofing panel into the considerations.