Wood Roof Truss Span Table

Geometry loading spacing bearing conditions etc.

Wood roof truss span table.

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. You can use sbca s span charts to roughly determine truss sizes available. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Basic lumber design values are f 2000 psi f 1100 psi f 2000 psi e 1 800 000 psi duration of load 1 00.

Floor truss span tables alpine engineered products 17 these allowable spans are based on nds 91. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Strength live load of 30 psf plus dead load of 10 psf determines the required bending design value.

Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 bottom chord 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2 12 24 24 33 27 27 37 31 31 43 33 33 46 2 5 12 29 29 39 33 33 45 37 38 52 39 40 55 3 12 34 34 46 37 39 53 40 44 60 43 46 64 3 5 12 39 39 53 41 44 61 44 50 65 47 52 70. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Deflection for 30 psf live load. View joist rafter tables.

Span tables below illustrate common combinations of the multiple variables available. Keep in mind that these tables are for estimations only. Spacing of trusses are center to center in inches. Limited to span in inches divided by 360.

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. Tcll 40 psf tcll 80 psf tcll 125 psf truss spacing truss spacing truss spacing. Floor truss span chart each individual floor truss design is unique based on multiple variables. And parallel to floor truss span strongback lateral supports 24 max.

Roof floor truss manual 7 31 08 10 43 am page 12. Maximum deflection is limited by l 360 or l 480 under live load.