Flat Wood Roof Truss Span Tables

Span tables for flat roof joists to bs 5268 7 2 imposed loads of 0 75 kn m for maintenance and snow load are applicable where there is no permanent access no fixed ladder or staircase and most areas where the altitude does not exceed 100 metres refer to bs 6399 3. 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. 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.

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The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses.

Flat wood roof truss span tables.

View joist rafter tables. Keep in mind that these tables are for estimations only. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. 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. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. You can use sbca s span charts to roughly determine truss sizes available. Spacing of trusses are center to center in inches.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. 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. 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.

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. 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. Maximum deflection is limited by l 360 or l 480 under live load.

Roof floor truss manual 7 31 08 10 43 am page 12. And parallel to floor truss span strongback lateral supports 24 max. 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.

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