Flat Roof Truss Span Tables

These steel joints are needed to support the overall truss.

Flat roof truss span tables.

Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. Basic lumber design values are f 2000 psi f 1100 psi f 2000 psi e 1 800 000 psi duration of load 1 00. 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. Keep in mind that these tables are for estimations only.

The same thing is true for the bridge of the truss. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Spacing of trusses are center to center in inches. And parallel to floor truss span strongback lateral supports 24 max.

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

View joist rafter tables. The more complex the truss framework is the greater quantity of these joints will be required. 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. Roof floor truss manual 7 31 08 10 43 am page 12.

They have not been updated for the change in lumber values within the last decade. 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 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. Also available for the android os.

Maximum deflection is limited by l 360 or l 480 under live load. Floor truss span tables alpine engineered products 17 these allowable spans are based on nds 91.