Metal Roof Rafter Spacing

The metal roof purlins spacing must be done correctly within narrow tolerances.

Metal roof rafter spacing.

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. Can span up to 13 4. 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. 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.

The wider the roofing panels the greater spacing distance you should put. Rafter spacing is based on the width of the metal roofing panels. These numbers are for roofs supporting light loads of 20 pounds for square foot. The spacing between rafters in a given building is part of the engineering calculations that determine the required structure of the roof.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. To determine how far apart to set rafters measure the width of the metal panel and then the width. 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. 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.

A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel. An spf roof at the same spacing and lumber size will span 11. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Wider panels allow for greater spacing between rafters.

That means it can span a total length of over 26 for a gable roof. There is a chance of damaging roofing sheets if you are failed to do so. Determine the location of a rafter by a vertical set of nails in the fascia board or by an exposed rafter tail. If you get premium kiln dried lumber then you could span 10 5 with the same size of lumber and.

An syp 2 6 rafter at 24 o c. 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. For standard shed roof rafter spacing see rafter span chart. For instance 2 grade 2x4s at 16 on center will span just over 9.