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9.20.2.7.(1)
ApplicationIntent
OS2OP2OH1OS1OH4OS3OP1
ObjectiveOS1 Fire Safety
Attribution
[F20,F80-OS1.2] Applies to assemblies required to provide fire resistance.
[F01-OS1.1,OS1.2] Applies to masonry used in chimneys and fireplaces.
Application
Application 1: 
Concrete blocks, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], used in:
  • above-ground, unreinforced masonry and masonry veneer walls and nominally reinforced masonry where vertical joints in adjacent courses are aligned [see Article 9.20.9.1.] :
    • where the wall height above the foundation wall does not exceed 11 m, and
    • in which the roof or floor system above the first storey is not of concrete construction,
  • interior masonry foundation walls not subject to lateral earth pressure [see Sentence 9.15.4.10.(1)],
  • in regions where the spectral response acceleration Sa(0.2) is greater than 0.55, loadbearing masonry elements of buildings more than 1 storey in building height [see Sentence 9.20.1.2.(1)]:
    • where the wall height above the foundation wall does not exceed 11 m, and
    • in which the roof or floor system above the first storey is not of concrete construction, and
  • in regions where the spectral response acceleration Sa(0.2) is greater than 0.35 and less than or equal to 0.55, loadbearing masonry elements of buildings 3 storeys in building height [see Sentence 9.20.1.2.(2)]:
    • where the wall height above the foundation wall does not exceed 11 m, and
    • in which the roof or floor system above the first storey is not of concrete construction.
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,
  • Sentence 9.20.6.4.(4), which applies to masonry veneer individually supported by the structural backing,
  • Sentence 9.20.6.6.(1), which applies to slab facings and precast concrete panel facings, and
  • Sentence 9.20.9.5.(3), which applies to the securing of masonry veneer individually supported by masonry or wood-frame backing.
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Intent
Intent 1: 
To limit the probability that concrete blocks will be unable to resist expected structural or environmental loads.
This is to limit the probability of:
  • where masonry construction is required to provide fire resistance, excessive deformation or cracking, which could lead to compromised fire resistance of the assembly, or
  • for chimneys and fireplaces, excessive heat transfer, which could lead to the ignition of combustible building components.
This is to limit the probability of harm to persons.
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