Flat Wood Roof Truss Span Tables

Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value.

Flat wood roof truss span tables.

Roof truss spans every trussteel roof truss is a custom design based upon the unique load span bearing use and code criteria of a particular project. 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. Basic lumber design values are f 2000 psi f 1100 psi f 2000 psi e 1 800 000 psi duration of load 1 00. Roof truss span tables alpine engineered products 15.

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. Maximum deflection is limited by l 360 or l 480 under live load. Included are a series of representative roof truss span tables that will give you an idea of the truss spans available for a particular load condition load duration lumber type and truss configuration. Flat depth 12.

Deflection for 30 psf live load. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Member of a truss. Roof floor truss manual 7 31 08 10 43 am page 12.

Limited to span in inches divided by 360. Keep in mind that these tables are for estimations only. Level returna lumber filler placed horizontally from the end of an overhang to the outside wall to form a soffit. Spacing of trusses are center to center in inches.

L d ratiothe ratio of the truss span l to its depth d both dimensions in inches. And parallel to floor truss span strongback lateral supports 24 max. Span calculator for wood joists and rafters also available for the android os. Also available for the android os.

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. Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. 72 5 0 mi ni m u m girder floor truss floor truss jacks a a bearing wall girder floor truss floor truss jacks bearing wall cantilevered floor truss two 2x rim joists 24 max. You can use sbca s span charts to roughly determine truss sizes available.

For example a 5 12 2 12 combination has approx. Live loadany temporary applied load to a floor truss chord. Typical roof truss design spans. Span tables for jois ts and rafters american wood council 4 span tables for joists and rafters american wood council design criteria.

The same allowable span as a 6 12 3 12.