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To size joists and rafters use the maximum span tables for southern yellow pine.
2x8 span for roof. For heavy roofs or in. Dead load weight of structure and fixed loads 15 lbs ft 2. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. A 2 2x10 can span 10 feet and so on.
A double 2x12 beam can span 12 feet. The larger the deck the larger the joists. Live load is weight of furniture wind snow and more. Let s consider a basic gable wood roof framing design.
Maximum rafter spans for a patio roof. More roof calculators roof truss calculator how to cut rafters. 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. Here we have a wood framed gable roof.
2x10 to 15 feet and 2x12 to 18 feet. 2 are indicated below. Also available for the android os. The numbers in gray indicate the distance between the support posts.
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. This is based upon the span of the rafter horizontal span not total rafter length live and dead loads. Floor beam span tables of residential structural design we will now look at roof rafter and beam design. 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.
1 psf lb f ft 2 47 88 n m 2. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. A 2x8 up to 12 feet. Span calculator for wood joists and rafters also available for the android os.
In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above. 1 ft 0 3048 m. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. This rafter span calculator is species specific for douglas fir hemlock etc.
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