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3.1.4.6.(6)
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Application
Application 1: 
Roofs in heavy timber construction in buildings described in Sentence 1.3.3.2.(1) of Division A where:
Application 2: 
This also applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] where heavy timber construction is considered to have a 45 min fire-resistance rating, as stated in Sentence 9.10.6.2.(1).
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Intent
Intent 1: 
To exempt roofs from the application of Sentence 3.1.4.6.(2), which would otherwise require larger dimensions, if certain conditions are met to limit the probability of premature structural failure of the heavy timber construction during a fire.
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