Rafter Spacing For Corrugated Roofing

Determining rafter s spacing is as important as setting the metal roof purlins spacing.

Rafter spacing for corrugated roofing. Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof. When placing rafters for a tin roof also frequently referred to as corrugated metal or steel it is common to set the distance between rafters based on the size of the roofing panels. Twenty four inches is a common spacing of furring strips for. 24 1 2 every 7 ft.

Correctly measure the spacing of furring strips for a metal roof to further decrease condensation. 24 1 2 every 6 ft. Rafter spacing depends on the roofing panel size. 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.

You also need to add furring strips. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. 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. So the space between rafters can be greater without reducing the maximum span.

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. Posted in metal roof roof types. 6 lay panels on rafters with one corrugation overlap and fasten with aluminum screw nails. 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.

Nail round and corrugated molding strips to framing then paint or stain wood before installing panels. You have to take the width of your roofing panel into the considerations. This allows the panels to be securely attached to the rafters for maximum stability.