Rafter Spacing

There is no standard spacing it depends on what size of rafters you want to use and the span of your shed.

Rafter spacing. 1 psf lb f ft 2 47 88 n m 2. Span calculator for wood joists and rafters also available for the. Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches. It is always better to have a large rafter rather than be concerned with a sagging roof.

Rafter spacing is based on the width of the metal roofing panels. 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. But they do tend to space rafters in one of several industry standard increments typically either 12 16 or 24 inches apart. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone.

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 instance 2 grade 2x4s at 16 on center will span just over 9. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. If your local building authority has a rafter spacing code you may not space rafters wider than required by code.

Rafter spacing rafters must be strong enough to hold the roof sheathing and the shingles. Dead load weight of structure and fixed loads 15 lbs ft 2. 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. Wider panels allow for greater spacing between rafters.

Spacing in exterior exposure. 2 are indicated below. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. 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.

Builders aren t bound by standard rafter spacing measurements. A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel. 1 ft 0 3048 m. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.