Flat Roof Truss Span Tables

Also available for the android os.

Flat roof truss span tables. Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope. View joist rafter tables. These steel joints are needed to support the overall truss. Span calculator for wood joists and rafters also available for the android os.

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. The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses. Maximum deflection is limited by l 360 or l 480 under live load. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

They have not been updated for the change in lumber values within the last decade. The more complex the truss framework is the greater quantity of these joints will be required. Basic lumber design values are f 2000 psi f 1100 psi f 2000 psi e 1 800 000 psi duration of load 1 00. 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.

Roof floor truss manual 7 31 08 10 43 am page 12. 05425 cold formed steel trusses 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. And parallel to floor truss span strongback lateral supports 24 max. Floor truss span tables alpine engineered products 17 these allowable spans are based on nds 91.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. 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. Keep in mind that these tables are for estimations only. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.

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. The same thing is true for the bridge of the truss.