Flat Roof Joists Span

Dead load weight of structure and fixed loads 15 lbs ft 2.

Flat roof joists span.

Span tables for joists and rafters 3 american wood council table 9 1 required compression perpendicular to grain design values f c in pounds per square inch for simple span joists and rafters with uniform load. The full version allows any size. Flat the most economical flat truss for a roof is provided when the depth of the truss in inches is approximately equal to 7 of the span in inches. Roof truss span chart.

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. Usually 400 450 or 600mm but any value can be used up to 610mm max. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

Trusses with an asterisk that exceed 14 in height may be. In these cases 2 inch by 10 inch lumber is often used for ceiling joists although trusses may be more practical. This demo version is fixed at 1m clear span. Use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.

Live load is weight of furniture wind snow and more. View joist rafter tables. Span ft 1 5 2 0 2 5 3 0 3 5 2 30 22 18 15 13 4 59 44 36 30 25 6 89 67 53 44 38 8 119 89 71 59 51 10 148 111. 1 ft 0 3048 m.

1 psf lb f ft 2 47 88 n m 2. Flat roof joist calculator. 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. 1 enter joist details 1 1 span and joist spacing.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. To achieve maximum indicated spans trusses may require six or more panels. Spans for joists greater than 20 feet that are parallel to the rafters require a 12 inch joist spacing when using 2 inch by 10 inch 2 douglas and hemlock fir or southern pine or 16 inch spacing when using 2 inch by 10 inch 2. 2 are indicated below.

This is the distance between joist centres. 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.