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5.7.1.1.(1)
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Building location, site grading, and installation of catch basins on the building site.
This applies to buildings to which Part 5 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 5].
Exceptions: 
except as stated in Sentence 5.7.1.1.(3), which applies to buildings specifically designed to accommodate the accumulation of water at the building or the ingress of water.
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Intent
Intent 1: 
To limit the probability of excessive moisture loading on assemblies, which could lead to prolonged exposure of building materials to moisture, which could lead to damage to and deterioration of building elements, which could lead to structural failure, which could lead to harm to persons.
Intent 2: 
To limit the probability of soil erosion, which could lead to compromised integrity of soils supporting the building, which could lead to structural failure, which could lead to harm to persons.
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