Metal Roof Rafter Spacing

Rafter spacing is based on the width of the metal roofing panels.

Metal roof rafter spacing.

These numbers are for roofs supporting light loads of 20 pounds for square foot. 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. Can span up to 13 4. 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.

Twenty four inches is a common spacing of furring strips for a metal roof. For instance 2 grade 2x4s at 16 on center will span just over 9. Determine the location of a rafter by a vertical set of nails in the fascia board or by an exposed rafter tail. An spf roof at the same spacing and lumber size will span 11.

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

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. For standard shed roof rafter spacing see rafter span chart. That means it can span a total length of over 26 for a gable roof. An syp 2 6 rafter at 24 o c.

To determine how far apart to set rafters measure the width of the metal panel and then the width. 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. 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. The metal roof purlins spacing must be done correctly within narrow tolerances.

If you get premium kiln dried lumber then you could span 10 5 with the same size of lumber and. The wider the roofing panels the greater spacing distance you should put. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Wider panels allow for greater spacing between rafters.