Safe Spans For No 1 Roof Rafters

1 psf lb f ft 2 47 88 n m 2.

Safe spans for no 1 roof rafters. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Live load is weight of furniture wind snow and more. View joist rafter tables. Table 9 1 in span tables for joists and rafters figure 5 gives a required compression value of 237 psi for a span of 16 feet and bearing length of 1 5 inches.

Calculations determine the maximum spacing based on the material used rafter size and load the roof needs to hold so that the roof is safe and meets all building codes. For more information see our disclosures here. Span calculator for wood joists and rafters also available for the android os. Dead load weight of structure and fixed loads 15 lbs ft 2.

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. Sample maximum spans feet inches douglas fir or larch no 1 or no 2 with 31 3 psf of snow loading. 1 ft 0 3048 m.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Span calculator for wood joists and rafters available for the iphone. 2 are indicated below. 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.

The 1 grade material is more expensive than the 2 grade but if you can use fewer or smaller 1 grade joists or rafters in your design you may actually save money. The maximum spans in the table above are for the horizontal distance the rafter can span not the diagonal distance or actual length of the rafter. While every effort has been made to insure the accuracy of the information presented and special effort has been made to assure that the information reflects the state of the art neither the west coast lumber inspection bureau the american wood council nor its members assume any responsibility for any particular design prepared from this online span calculator. This table is simply a sample and may not be valid for your region.

This post may contain affiliate links. Patio roof maximum beam rafter spans. The tables permit a bearing length of up to 3 5 inches but since 1 5 is probably the worst case that you ll encounter for joist or rafter bearing it s a safe value.