Roof floor truss manual 7 31 08 10 43 am page 12.
Flat wood roof truss span tables.
Span calculator for wood joists and rafters also available for the android os.
Deflection for 30 psf live load.
L d ratiothe ratio of the truss span l to its depth d both dimensions in inches.
Floor truss span tables alpine engineered products 17 these allowable spans are based on nds 91.
Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value.
For example a 5 12 2 12 combination has approx.
Member of a truss.
The same allowable span as a 6 12 3 12.
Flat depth 12.
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.
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.
Limited to span in inches divided by 360.
Level returna lumber filler placed horizontally from the end of an overhang to the outside wall to form a soffit.
You can use sbca s span charts to roughly determine truss sizes available.
Typical roof truss design spans.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Span tables for jois ts and rafters american wood council 4 span tables for joists and rafters american wood council design criteria.
Keep in mind that these tables are for estimations only.
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.
Spacing of trusses are center to center in inches.
Live loadany temporary applied load to a floor truss chord.
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.
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.
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.
Also available for the android os.
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.
Typically roof live load is snow while floor live loads are furniture.
