Rafter Spacing For Metal Roofing

It is always better to have a large rafter rather than be concerned with a sagging roof.

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

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. The metal roof purlins spacing must be done correctly within narrow tolerances. There is a chance of damaging roofing sheets if you are failed to do so.

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. Rafter spacing is based on the width of the metal roofing panels. The wider the roofing panels the greater spacing distance you should put.

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. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Rafter spacing for metal roof purlin hangers clips are available if you would rather the purlin be on the same level as the rafter rather than on top of the rafter.