You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
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.
Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Typically roof live load is snow while floor live loads are furniture.
The same allowable span as a 6 12 3 12.
Spacing of trusses are center to center in inches.
Roof floor truss manual 7 31 08 10 43 am page 12.
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.
For example a 5 12 2 12 combination has approx.
Level returna lumber filler placed horizontally from the end of an overhang to the outside wall to form a soffit.
Keep in mind that these tables are for estimations only.
Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value.
Member of a truss.
Span calculator for wood joists and rafters also available for the android os.
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.
Maximum deflection is limited by l 360 or l 480 under live load.
You can use sbca s span charts to roughly determine truss sizes available.
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.
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.
Roof truss span tables alpine engineered products 15.
Basic lumber design values are f 2000 psi f 1100 psi f 2000 psi e 1 800 000 psi duration of load 1 00.
Span tables for jois ts and rafters american wood council 4 span tables for joists and rafters american wood council design criteria.
Typical roof truss design spans.
Limited to span in inches divided by 360.
L d ratiothe ratio of the truss span l to its depth d both dimensions in inches.
Flat depth 12.
Deflection for 30 psf live load.
The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses.
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.
