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9.14.3.3.(4)
ApplicationIntent
OH1OS2OP2
ObjectiveOS2 Structural Safety
Attribution
[F60-OS2.1,OS2.2,OS2.3]
Application
Application 1: 
Granular material used to cover drain tiles and drain pipes that are installed at 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 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)],
  • 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 a layer of gravel or crushed rock, 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 of inadequate percolation down to drain tiles or pipes, which could lead to silting-up, which could lead to excessive moisture loading on foundation walls and basement floors.
This is to limit the probability of the accumulation of water under hydrostatic pressure, which could lead to:
  • compromised structural integrity of foundation walls and basement floors, or of elements supported by the walls or floors, or
  • deterioration, which could lead to compromised integrity of elements supported or protected by exterior foundation walls.
This is to limit the probability of harm to persons.
Intent 2: 
To limit the probability of inadequate percolation down to drain tiles or pipes, which could lead to silting-up, which could lead to excessive moisture loading on the soil immediately beneath the footings, which could lead to saturation and a reduction in the soil's bearing capacity, which could lead to the failure of foundation walls and basement floors, which could lead to harm to persons.
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