Rafter Spacing For Corrugated Roofing

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.

Rafter spacing for corrugated roofing.

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 most common measurement used for rafter spacing is either 16 or 24 inches. 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. You also need to add furring strips.

Posted in metal roof roof types. 6 lay panels on rafters with one corrugation overlap and fasten with aluminum screw nails. Twenty four inches is a common spacing of furring strips for. Rafter spacing depends on the roofing panel size.

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. You have to take the width of your roofing panel into the considerations. 24 1 2 every 6 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. Determining rafter s spacing is as important as setting the metal roof purlins spacing. Nail round and corrugated molding strips to framing then paint or stain wood before installing panels. 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. 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. So the space between rafters can be greater without reducing the maximum span.