Parallel Chord Roof Truss Span Chart

Spans shown are in feet 4.

Parallel chord roof truss span chart.

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. 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. And parallel to floor truss span strongback lateral supports 24 max.

The offset scissor truss has a bottom chord that is flat for a distance and then is vaulted up and back down. You can use sbca s span charts to roughly determine truss sizes available. The cap truss is very similar to a gable truss with webs transferring loads vertically into the base truss below it. Tcdl 10 psf and bcdl 5 psf 3.

Openings are to be located in the center of the span max opening width is 24 inches 7. Basic lumber design values are f 2000 psi f 1100 psi f 2000 psi e 1 800 000 psi duration of load 1 00. The bottom chord of the cap truss is typically moved up 1 1 2 for 2x4 continuous lateral restraints over the flat top chord of the base truss or the thickness of whatever material may be used 3 4 for plywood osb etc. The truss is a framework consisting of rafters posts and struts which supports your roof.

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. Spacing of trusses are center to center in inches. Roof floor truss manual 7 31 08 10 43 am page 12. Jbs 11 17 truss types.

Top and bottom chords braced by structural sheathing 6. Live load l 480 total load l 360 5. Parallel chord trusses allow for greater interior clearance in buildings. Keep in mind that these tables are for estimations only.

Tcll top chord floor live load 2. Parts of a truss framed roof gable end valley set gi rde t u s dutch hip girder dutch hip framing stepdown hip framing end jack stepdown girder stepdown truss c om n truss 2141 james d hagood halifax va 24558 434 572 1379. Alpine truss designs are engineered to meet specific span configuration and load conditions. 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.

Typical flat parallel chord trusses stepdown hip h ip g rde california hip.