We have the Material Group Number and Average Specific Extinction Area for 9mm radiata pine plywood (see https://www.woodsolutions.com.au/articles/fire-test-reports), but not critical radiant flux or smoke growth rate. However, our understanding is that the BCA only requires a smoke growth rate index not more than 100 OR an average specific extinction area less than 250 m2/kg, not both – refer Specification C1.10 Section 4. If both values are required in a different part of the BCA please advise so we can update our information – we don’t claim to be experts on the BCA.
Do you have a fire certificate that includes a BCA group numbers & critical radiant flux values for a structural pine 9mm Ply.
I am trying to find a design guide or manual for the design and specification of nail laminated timber including:
- reduction factors relating to lamination
- maximum spacing of nails etc.
Do you have any resources that focus on nail lamination?
If you have access to Australian Standards nail lamination is covered in Section 2.4.5 of AS 1720.1, Timber structures, Part 1: Design Methods. Section 2.4.5 is titled Strength sharing between parallel members. The calculation of the modification factor for strength sharing, k9, is given as equation 18.104.22.168. For nail-laminated members AS 1684.2 Residential timber-framed construction assumes nmem = 1.0 and ncom = number of combined sections in calculating k9. Or to keep it simple just refer to AS 1684.2, Section 2.3 where the recommended nail pattern is shown.
I am searching for the 'fire rating' of American white oak. And am keen to learn if it meets Australian Standards
FWPA has sponsored fire testing on a range of timbers including American white oak. Note the typographical error – it’s actually Quercus alba, not Quercus abla. This and other fire test reports can be found on our website here: https://www.woodsolutions.com.au/articles/fire-test-reports
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