Attic Truss Span Tables

Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.

Attic truss span tables. The more complex the truss framework is the greater quantity of these joints will be required. 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. Straight line interpolation shall be permitted for intermediate spans and design values. 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. Garage attic ion the journal board. 30 diffe types of roof trusses roof truss endix 1 8 13 span tables city of garage attic ion the 30 diffe types of roof trusses. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge.

These steel joints are needed to support the overall truss. Attic trusses can be designed as clear span using the external walls only for support. They have not been updated for the change in lumber values within the last decade. 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.

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. And parallel to floor truss span strongback lateral supports 24 max. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center.

The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter. The same thing is true for the bridge of the truss. 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. October 28 2017 by zamira leave a comment.

When intermediate supporting walls are also available larger internal room dimensions within the attic truss are achievable. Attic truss span table. Keep in mind that these tables are for estimations only. 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.