Standard Wood Roof Truss Sizes

Spans for 2x4 top chord trusses using sheathing other than plywood e g.

Standard wood roof truss sizes.

600 timber thickness mm. 35 timber size information. Essentially a roof truss is a prefabricated frame of supports designed to go on top of a building as it s being built. Standard framing details for use in preliminary design.

This truss has a 30 span which is only 4 more than 26 but look how much more webbing there is. A truss with the same pitch and heel on both sides and a peak at the center is called a common truss. You can use sbca s span charts to roughly determine truss sizes available. Girder trusses are designed to carry additional loads other than standard roof loads.

Member size grade tc 1 4 4 7 97 tr26 bc 6 10 72 tr26 bc 10 2 72 tr26 wb 3 8 5. Spaced sheathing or 1x boards may be reduced slightly. 0 524 kn m ceiling dead load. 0 785 kn m snow load.

The truss is a framework consisting of rafters posts and struts which supports your roof. 0 250 kn m ceiling live load 0 250 kn m tank load 0 450 kn max tile batten centres. 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. The standard roof truss spacing is 2.

Standard roof truss general load settings. The webbing is necessary for the strength of the truss and it is needed in a truss this size. 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.

A truss of this size and larger usually runs a higher figure of around 4 to 4 75 per foot of truss. The steeper the roof the more expensive the trusses get because the longer the boards get and the more roof area increases. 360 mm general truss information. 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.