We can now advise that Regulatory Information Report 41117.11 has been extended to 30 April 2025 by Warringtonfire Australia - refer Letter of Extension LOE 1.2 available on our website here: https://www.woodsolutions.com.au/resources/standards-codes/fire-test-reports.

It is correct that our Regulatory Information Report 41117 version 11 refers specifically to NCC 2019. This will be updated at the next review. Meanwhile our technical people advise that It is not really the year of the NCC that matters, but the test method that is referenced.  NCC 2019 Amdt1 and NCC 2022, as will NCC 2025, require group numbers to be determined in accordance with AS 5637.1. and critical radiance flux to be determined in accordance with AS ISO 9239.1.

The ABCB Housing Provisions don't specifically deal with damp-courses under timber frames. The assumption is that they will be used in brickwork or under concrete slabs. However, it can be a useful precaution to place a damp-course under the outside wall of a timber frame that is seated on a concrete slab. While problems rarely arise if no damp-course is present, occasionally slabs are subject to edge dampness.

Supplement no. 5 to Australian Standard 1684.2-2010 for non-cyclonic areas tells us that in N1/N2 wind areas 190 x 45 MGP 12 rafters @ 600mm centres will span 5.3m. That's for a single span (supported only at each end).