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9.30.1.2.(1)
OS2OH1
ObjectiveOS2 Structural Safety
Attribution
[F80-OS2.3] Applies where finished flooring is required to provide water resistance.
Application
Application 1: 
Moisture protection of subfloors in bathrooms, kitchens, public entrance halls and laundry areas, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where a water permeable finish is supported by a subfloor of a type that would be damaged by water.
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Intent
Intent 1: 
To limit the probability of the inadequate protection of subfloors, which, on repeated exposure to water, could lead to compromised structural integrity of the supporting structure, which could lead to an inability to resist expected gravity loads, which could lead to structural collapse, which could lead to harm to persons.
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