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Dead load weight of structure and fixed loads 15 lbs ft 2.
2x8 roof joist span. Live load is weight of furniture wind snow and more. 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. While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length. Maximum rafter spans for a patio roof.
Table r802 4 1 ceiling joist spans for common lumber species uninhabitable attics without storage live load 10 psf l δ 240. Span calculator for wood joists and rafters also available for the android os. Spans for ceiling joists shall be in accordance with tables r802 4 1 and r802 4 2. When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started.
For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2. Joist span and spacing is set by your local building code. View joist rafter tables. Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor.
Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. 1 ft 0 3048 m. 2 x 12 s are not listed because you can span pretty much whatever you want. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. This ceiling joist span table is based on the 2012 irc for uninhabitable attics with limited storage. 2 are indicated below. 1 psf lb f ft 2 47 88 n m 2.
Also available for the android os. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Joist span tables use these tables to determine lengths sizes and spacing of ceiling joists. It covers 2 common lumber species and sizes at 20 pounds per square foot load.
Although 2 x 4 s are included in the official table they are not listed because it is never advised to use them.
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