Standard Roof Truss Sizes

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

Standard roof truss sizes.

This is the distance between trusses. Pre manufactured stock trusses are constructed with spruce pine fir spf or southern yellow pine syp lumber. Girder trusses are designed to carry additional loads other than standard roof loads. 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.

Common or standard trusses are symmetrical and have standard four inch heels. They are designed at a 4 12 pitch to be spaced 2 foot on center. The standard roof truss spacing is 2. A truss with the same pitch and heel on both sides and a peak at the center is called a common truss.

These trusses the meet building code criteria as specified by structural building components of america sbca and the truss plate institute tpi. The steeper the roof the more expensive the trusses get because the longer the boards get and the more roof area increases.