ARCHIVED - 9.3.1.9.(2)

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9.3.1.9.(2)


Objective	OH1 Indoor Conditions
Attribution	[F20-OH1.1] Applies where concrete supports or is used in the walls of chimneys or fireplaces. [F20,F61,F55-OH1.1,OH1.2] [F20,F61-OH1.3] Applies where concrete supports or is used in an environmental separator.
Application	Application 1: Cast-in-place concrete that is not required to be reinforced that is used in: footings, foundation walls, walls, columns, grade beams and piers, crawl space ground cover, basement floors, including floors of basement garages, subject to hydrostatic pressure or providing lateral resistance to foundation walls, exterior steps providing structural support (to guards or handrails, for example), and fireplaces and chimneys. This applies to 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: interruption of the hydration process, freezing and expansion of internal water, and over-watering due to the melting of ice. This is to limit the probability of the failure of internal bonds in the concrete, which could lead to reduced compressive strength, which could lead to an inadequate resistance to: expected environmental or structural loads, or air and moisture transfer. This is to limit the probability of: where concrete supports or is used in an environmental separator the compromised integrity of the environmental separator, or an inadequate resistance to air and moisture transfer through the concrete, and where concrete supports or is used in the walls of chimneys or fireplaces, failure of these walls. This is to limit the probability of: pollutant ingress (from the exterior or from adjacent interior space, including soil gas, combustion products from parking garages, and particulates), precipitation ingress, condensation, the ingress of moisture from the ground, the leakage of combustion products, or the compromised thermal performance of components intended to provide resistance to heat transfer. This is to limit the probability of: the generation of pollutants from biological growth or from materials that become unstable on wetting, deterioration, which could lead to further compromised integrity of environmental separators, or an inadequate control of indoor air and surface temperatures, drafts, relative humidity, or water accumulation. This is to limit the probability of: negative effects on the air quality of indoor spaces, the inadequate thermal comfort of persons, and contact with moisture. This is to limit the probability of harm to persons.
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