Standard Wood Roof Truss Sizes

600 timber thickness mm.

Standard wood roof truss sizes.

Essentially a roof truss is a prefabricated frame of supports designed to go on top of a building as it s being built. This is the distance between trusses. A truss of this size and larger usually runs a higher figure of around 4 to 4 75 per foot of truss. Standard roof truss general load settings.

The standard roof truss spacing is 2. 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. 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. 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. Member size grade tc 1 4 4 7 97 tr26 bc 6 10 72 tr26 bc 10 2 72 tr26 wb 3 8 5. The webbing is necessary for the strength of the truss and it is needed in a truss this size.

Spans for 2x4 top chord trusses using sheathing other than plywood e g. 360 mm general truss information. 0 524 kn m ceiling dead load. 35 timber size information.

Girder trusses are designed to carry additional loads other than standard roof loads. Standard framing details for use in preliminary design. 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. 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.

0 250 kn m ceiling live load 0 250 kn m tank load 0 450 kn max tile batten centres. 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. 0 785 kn m snow load. 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.