Parallel Chord Roof Truss Span Chart

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Parallel chord roof truss span chart.

Spans shown are in feet 4. Top chord dead load 10 psf. Center line chase 24 max. Other floor and roof loading conditions a variety of species and other lumber grades are available.

Top and bottom chords braced by structural sheathing 6. Tcdl 10 psf and bcdl 5 psf 3. The truss is a framework consisting of rafters posts and struts which supports your roof. Openings are to be located in the center of the span max opening width is 24 inches 7.

Spacing of trusses are center to center in inches. Strongback splicing at change of span type 2 bracing unit 70 x 35 block fixed to msj with 2 75mm 3 05ø nails to top chord and bottom chord multigrip strongback strongback fix bracing panel to vertical webs with 2 30mm x 2 8ø nails fix trimmer to wall top plate with 3 75mm x 3 05ø nails 7 0 mm structural plywood or equivalent masonite fixed. 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 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.

Live load l 480 total load l 360 5. You can use sbca s span charts to roughly determine truss sizes available. The important point to keep in mind when you use your truss calculator is that every truss calculation is completely unique and is based on the size of your roof and its specific dimensions. Trusses must be designed for any special loading such as concentrated loads.