An spf roof at the same spacing and lumber size will span 11.
Roof rafter spacing 2x6.
If your local building authority has a rafter spacing code you may not space rafters wider than required by code.
Spacing in exterior exposure.
Dead load weight of structure and fixed loads 15 lbs ft 2.
These numbers are for roofs supporting light loads of 20 pounds for square foot.
If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.
1 ft 0 3048 m.
Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.
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Rafter and roof joist spacing is only one part of a complex roof design that works together to form a structure that meets building codes and can hold up the weight of the roof and roof load.
Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches.
Live load is weight of furniture wind snow and more.
2 are indicated below.
Span calculator for wood joists and rafters also available for the.
1 psf lb f ft 2 47 88 n m 2.
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.
Live load psf dead load psf span calculator for wood joists and rafters available for the iphone.
Rafter spacing rafters must be strong enough to hold the roof sheathing and the shingles.
But they do tend to space rafters in one of several industry standard increments typically.
Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.
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.
It is always better to have a large rafter rather than be concerned with a sagging roof.
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.
That means it can span a total length of over 26 for a gable roof.
An syp 2 6 rafter at 24 o c.
Patio roof maximum beam rafter spans.