Looking for current fire hazard test reports for solid 19mm tas oak internal flooring and solid 19mm treated pine external decking, however advice seems to indicate we have no currently applicable testing data to NCC2022.
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. So given that the referenced test methods in NCC 2019 and NCC 2022 are the same we don't anticipate any change when RIR 41117 is reviewed.
We are looking at using a membrane under the untreated bottom plate and wonder what type of membrane is to be used best? The ones on the market that we looked at are either 'embossed polythene dampcourse' or the 'bitumen damp-course'. Any comment to the above would be appreciated.
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. At WoodSolutions we have no particular preference as to the type of damp-course to place under timber but suggest you seek one that complies with AS-2012-Waterproofing-membranes for external-above-ground use.
Can you please tell me maximum span for 190 x 45 mgp 12 H3 treated pine 600 mm spacing 40 kgs/square metre on roof rafters?
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).
