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9.20.9.1.(1)
OH1OS2OP2OS1OH4OS3
ObjectiveOS1 Fire Safety
Attribution
[F20-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Vertical joints in adjacent courses in:
  • above-ground, nominally unreinforced masonry, and
  • above-ground masonry reinforced with the equivalent of not less than 2 corrosion-resistant steel bars of 3.76 mm diam placed in the horizontal joints at vertical intervals not exceeding 460 mm.
This applies to masonry construction to which Section 9.20. applies [see Sentence 9.20.1.1.(1) for application of Section 9.20.], in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except as stated in Sentence 9.20.1.1.(2), which applies to buildings other than described above, or where the masonry is designed for specified loads on the basis of ultimate and serviceability limit states.
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Intent
Intent 1: 
To limit the probability of an inadequate resistance to in-plane and transverse shear stresses, which could lead to cracking or structural failure of vertical mortar joints.
Where masonry construction is required to provide fire resistance, this is to limit the probability of compromised fire resistance of the assembly, which could lead to harm to persons.
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