Rafter Spacing For Metal Roofing

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

Rafter spacing for metal roofing.

It is always better to have a large rafter rather than be concerned with a sagging roof. Other relevant factors include the type of wood being used for the rafters the size of the rafters and the load that the rafters need to support. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. 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.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. The spacing between rafters in a given building is part of the engineering calculations that determine the required structure of 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. The width of metal panels will determine the rafter spacing.

Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. There is a chance of damaging roofing sheets if you are failed to do so. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.

Wider panels allow for greater spacing between rafters. The metal roof purlins spacing must be done correctly within narrow tolerances. 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.