A residential structures ncc building classes 1 2 3 and 10 and light commercial structures.

Timber roof trusses dimensions. All trusses use commonly available timber and most fl oor trusses in australia are made from 70mm or 90mm dry timber. B maximum roof pitch 45 degrees. 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. C maximum truss span 16 m.

Most basic timber roof trusses timber dimensions are 90x35mm and start at strength grade mgp10 old grading called f5. The truss is a framework consisting of rafters posts and struts which supports your roof. This document intends to apply to nailplate timber roof trusses within the following general limitations. We usually opt for the 35mm thickness in timber when designing standard roof trusses.

If the truss requires a bigger timber size due to the load it is to carry the bigger size is usually applied to the bottom chord first leaving the top chord and webs at 90x35mm. There are two different types of web systems for these trusses.

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