Spacing Roof Rafters

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

Spacing roof rafters.

For standard shed roof rafter spacing see rafter span chart. 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. This post may contain affiliate links. The metal roof purlins spacing must be done correctly within narrow tolerances.

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. It is always better to have a large rafter rather than be concerned with a sagging roof. Rafters must be strong enough to hold the roof sheathing and the shingles. The spacing between rafters in a given building is part of the engineering calculations that determine the required structure of the roof.

There is no standard spacing it depends on what size of rafters you want to use and the span of your shed. Wider panels allow for greater spacing between rafters. 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.

Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches. 2 4 rafters can span up to 7. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. There is a chance of damaging roofing sheets if you are failed to do so.

For light load roofs 24 o c. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. Span calculator for wood joists and rafters also available for the. Patio roof maximum beam rafter spans.

For instance 2 grade 2x4s at 16 on center will span just over 9. If you get premium kiln dried lumber then you could span 10 5 with the same size of lumber and. For heavy loads 2x4s can span up to 5. Spacing in exterior exposure.

If your local building authority has a rafter spacing code you may not space rafters wider than required by code. For more information see our disclosures here. Spacing your 2 4 shed rafters at 24 on center limits the width of your 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.