Rafter Spacing For Corrugated Roofing

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.

Rafter spacing for corrugated roofing.

24 1 2 every 7 ft. Twenty four inches is a common spacing of furring strips for. This allows the panels to be securely attached to the rafters for maximum stability. 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.

24 1 2 every 6 ft. 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. 6 lay panels on rafters with one corrugation overlap and fasten with aluminum screw nails. 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.

The same concept holds true for roof trusses. Rafter spacing depends on the roofing panel size. 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.

You also need to add furring strips. Nail round and corrugated molding strips to framing then paint or stain wood before installing panels. The most common measurement used for rafter spacing is either 16 or 24 inches. 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.

Posted in metal roof roof types. 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. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.