Rafter Spacing For Corrugated Roofing

The most common measurement used for rafter spacing is either 16 or 24 inches.

Rafter spacing for corrugated roofing.

24 1 2 every 7 ft. 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. 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. 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.

Determining rafter s spacing is as important as setting the metal roof purlins spacing. 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. Rafter spacing depends on the roofing panel size. Twenty four inches is a common spacing of furring strips for.

You have to take the width of your roofing panel into the considerations. 6 lay panels on rafters with one corrugation overlap and fasten with aluminum screw nails. 24 1 2 every 6 ft. 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.

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. This allows the panels to be securely attached to the rafters for maximum stability. You also need to add furring strips. So the space between rafters can be greater without reducing the maximum span.

The same concept holds true for roof trusses. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Posted in metal roof roof types.