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9.14.4.1.(1)
ApplicationIntent
OS2OP2OH1OS2OP2OH1OH4OS3
ObjectiveOS3 Safety in Use
Attribution
(b) [F21-OS3.1] Applies to floors and elements that support floors.
Application
Application 1: 
Granular material that is laid down to drain the bottom of exterior foundation walls of buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except for:
  • for the foundation walls of crawl spaces whose exterior walls have 25% or more of their total area above exterior ground level open to the outdoors [see Sentence 9.18.1.1.(1)] and where drainage can be shown to be unnecessary [see Sentences 9.18.5.1.(1) and (2)],
  • for foundation walls that are subject to continuous hydrostatic pressure,
  • as stated in Sentence 9.14.2.1.(1), which applies to foundation walls that are drained by drain tiles or pipes, and
  • for foundation walls that are effectively drained by the native soil or that have otherwise demonstrated that they do not require drainage.
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Intent
Intent 1: 
To limit the probability that weathering of pyritic material will lead to excessive loading on foundation walls, under lateral soil pressure, with attendant structural damage to the foundation and superstructure.
For floors and elements supporting floors, this is to limit the probability of excessive deflection or damage, which could lead to rough or uneven floor surfaces, which could lead to persons tripping or falling, which could lead to harm to persons.
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