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9.20.2.3.(1)
ApplicationIntent
OS2OP2OH1OH4OS3OS1OP1
ObjectiveOS3 Safety in Use
Attribution
[F20-OS3.1] Applies to floors and elements that support floors.
[F01,F20-OS3.4] Applies to masonry used in chimneys and fireplaces.
Application
Application 1: 
Glass blocks used in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability of an inability to resist gravity, lateral or impact loads.
This is to limit the probability of:
  • compromised structural integrity of masonry construction,
  • where masonry construction is part of an environmental separator, the displacement or failure of required environmental separation elements, which could lead to deterioration.
This is to limit the probability of:
  • for floors and elements supporting floors, excessive deflection, which could lead to persons losing their balance, tripping or falling, or
  • where masonry is used in chimneys and fireplaces, the cracking of masonry units, which could lead to the leakage of combustion products, which could lead to asphyxiation or acute poisoning.
This is to limit the probability of harm to persons.
Intent 2: 
To limit the probability of an inability to withstand high temperatures, which could lead to the cracking of masonry units, which could lead to the leakage of combustion products, which could lead to asphyxiation or acute poisoning, which could lead to harm to persons.
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