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9.20.6.2.(2)
ApplicationIntent
OH1OS2OP2OH4OS3OS1
ObjectiveOS1 Fire Safety
Attribution
[F61-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
In buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], width of cavities in above-ground, unreinforced and nominally reinforced masonry cavity walls, loadbearing masonry cavity walls of buildings of more than one storey in regions where the spectral response acceleration Sa(0.2) is greater than 0.55 that are reinforced in accordance with Sentence 9.20.1.2.(1), and loadbearing masonry cavity walls of 3-storey buildings in regions where the spectral response acceleration Sa(0.2) is greater than 0.35 and less than or equal to 0.55 that are reinforced in accordance with 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.
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Intent
Intent 1: 
To limit the probability of an inadequate width of cavities, which could lead to extruded mortar bridging the cavity, which could lead to water crossing the cavity and penetrating the interior wythes by capillary action, which could lead to the deterioration of the interior wythes.
This is to limit the probability of precipitation or meltwater ingress, which could lead to deterioration due to freeze-thaw stresses.
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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