Standard Roof Truss Sizes

These trusses the meet building code criteria as specified by structural building components of america sbca and the truss plate institute tpi.

Standard roof truss sizes.

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. Pre manufactured stock trusses are constructed with spruce pine fir spf or southern yellow pine syp lumber. 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. You will also incur additional costs because it is much harder to deck and shingle a roof that is 12 12 pitch versus a 4 12 roof.

The steeper the roof the more expensive the trusses get because the longer the boards get and the more roof area increases. A truss with the same pitch and heel on both sides and a peak at the center is called a common truss. The truss is a framework consisting of rafters posts and struts which supports your roof. They are designed at a 4 12 pitch to be spaced 2 foot on center.

This is the distance between trusses. The standard roof truss spacing is 2.