Standard Wood Roof Truss Sizes

600 timber thickness mm.

Standard wood roof truss sizes.

Spaced sheathing or 1x boards may be reduced slightly. 0 785 kn m snow load. Member size grade tc 1 4 4 7 97 tr26 bc 6 10 72 tr26 bc 10 2 72 tr26 wb 3 8 5. A truss of this size and larger usually runs a higher figure of around 4 to 4 75 per foot of truss.

35 timber size information. A truss with the same pitch and heel on both sides and a peak at the center is called a common truss. Standard framing details for use in preliminary design. 0 250 kn m ceiling live load 0 250 kn m tank load 0 450 kn max tile batten centres.

You can use sbca s span charts to roughly determine truss sizes available. The steeper the roof the more expensive the trusses get because the longer the boards get and the more roof area increases. The truss is a framework consisting of rafters posts and struts which supports your roof. Common or standard trusses are symmetrical and have standard four inch heels.

360 mm general truss information. Standard roof truss general load settings. Trusses must be designed for any special loading such as concentrated loads from hanging partitions or air conditioning units and snow loads caused by driftingnearparapetorslide offfromhigherroofs. The standard roof truss spacing is 2.

Spans for 2x4 top chord trusses using sheathing other than plywood e g. 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. Girder trusses are designed to carry additional loads other than standard roof loads. 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.

This is the distance between trusses. 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. This truss has a 30 span which is only 4 more than 26 but look how much more webbing there is. Easily attached to the rest of the building s frame they circumvent the complicated expensive nature of from scratch roof framing and can be purchased in a wide variety of designs made from either lumber commonly used for homes or metal primarily used for commercial.