Parallel Chord Roof Truss Span Chart

The truss is a framework consisting of rafters posts and struts which supports your roof.

Parallel chord roof truss span chart. The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers. Floor truss span tables alpine engineered products 17 these allowable spans are based on nds 91. The partial scissor truss is similar except that the bottom chord slopes up in one direction and then straight down while the remaining portion is flat. 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.

Spacing of trusses are center to center in inches. You can use sbca s span charts to roughly determine truss sizes available. The offset scissor truss has a bottom chord that is flat for a distance and then is vaulted up and back down. Basic lumber design values are f 2000 psi f 1100 psi f 2000 psi e 1 800 000 psi duration of load 1 00.

Alpine truss designs are engineered to meet specific span configuration and load conditions. 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. Total load psf duration factor live load psf roof type 55 1 15 40 snow shingle 55 1 15 30 snow tile 47 30 snow 40 20 snow 1 25 20. Keep in mind that these tables are for estimations only.

Maximum deflection is limited by l 360 or l 480 under live load. And parallel to floor truss span strongback lateral supports 24 max.