The main purpose of a lintel trimmer is to provide fixing for the internal linings, since it "trims" the lintel to the same line as the wall studs. As long as your lintel is correctly sized, we don't see any problem using a 90 x 35 trimmer, either fixed to the underside of the lintel or supporting jack studs as per AS 1684.2, Figure 6.9. Also the required 15 mm clearance between the top of the window frame and the lintel trimmer must be maintained to allow for deflection.
The Resilient Timber Homes program is managed by WoodSolutions through a Steering Committee supported by a group of experienced and dedicated partners.
Research Partners are involved in the design and management of the whole program and/or a specific activity. They get full IP rights for commercial outcomes and share rights for non-commercial ones.
The Resilient Timber Homes program has a clear value proposition:
The program is:
Code-compliant timber frame construction is robust and resilient when subjected to adverse and extreme conditions, including those associated with floods, bushfires, and cyclones, for every location in Australia. And they provide more than just life safety (which is the main objective of the NCC) and adequate property protection through good durability and easy maintenance. They offer better comfort and wellness. That’s why timber framed homes are so popular with developers, builders, and owners/occupiers.
The effects of bushfires, floods, storms, and other extreme weather events are becoming increasingly critical for our communities, environment, and economy.
We are not familiar with CSR system 2356, but it appears to achieve an FRL of 60/60/60. Timber charring blocks would only be required where the fire resistant plasterboard is penetrated.
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