Roof Truss Span Tables

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 truss span tables.

These steel joints are needed to support the overall truss. Joist and rafter 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. The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter.

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 4 12 41 43 59 43 49 64 46 56 69 49 57 74 5 12 44 52 67 46 58 69 49 66 74 53 66 80 6 12 46 60 69 47 67 71 51 74 76 55 74 82 7 12 47 67 70 48. The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses. These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center. The more complex the truss framework is the greater quantity of these joints will be required.

View joist rafter tables. 1 spans shown in charts are in feet. Typical roof truss design spans general notes. Span calculator for wood joists and rafters also available for the android os.

And parallel to floor truss span strongback lateral supports 24 max. Straight line interpolation shall be permitted for intermediate spans and design values. They have not been updated for the change in lumber values within the last decade. Roof floor truss manual 7 31 08 10 43 am page 12.

Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Every trussteel roof truss is a custom design based upon the unique load span bearing use and code criteria of a particular project. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Also available for the android os.

The same thing is true for the bridge of the truss. Roof truss span tables. 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.