Timber Roof Truss Design Guide Australia

Some myths about roof rafters.

Timber roof truss design guide australia.

Triangular roof trusses may be identified by the web bracing used and the simple triangular geometric shape used throughout their design. The guide is intended as a guide only to the installation of timber roof trusses and should only be used by properly trained and qualified staff who are competent in the installation of 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. Timber trusses and frames have a vital role to play in the most modern australian homes.

The top chords are straight. Most basic timber roof trusses timber dimensions are 90x35mm and start at strength grade mgp10 old grading called f5. Rafters are considered by the public and often by professionals to be the most cost effective roofing solution but this is a misconception. Roof trusses other than these 1.

Provided the design takes them into account. Installation guidelines for timber roof trusses to be read in conjunction with as4440 2004 september 2016 2. Triangular roof trusses 2. Stubbed duo with raised ends in support areas is used at higher loads because this design is able to withstand higher roofing and snow loads than duo timber trusses.

The guide is intended to be used only for roof trusses supplied by accredited multinail truss fabricators. These contain the most common types of trusses used for building. 1 4 services 1 4 1 general. These crucial elements support the weight of the building as well as provide surfaces for an extensive range of structure covering technologies.

A timber truss roof design guide in australia.