ARCHIVED - 9.23.4.2.(1)

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9.23.4.2.(1)


Objective	OH1 Indoor Conditions
Attribution	[F20,F22-OH1.1,OH1.2,OH1.3] Applies to elements that support or are part of an environmental separator.
Application	Application 1: Maximum spans, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.], for: lumber joists used to support floors in residential areas, where the live load does not exceed 1.9 kPa, or supporting a topping of concrete that is of normal weight and 38 to 51 mm thick, that is placed directly on the subflooring, and that has not less than 20 MPa compressive strength after 28 days [see Article 9.23.4.4.], lumber joists and rafters used to support roofs: where specified snow loads do not exceed 3.0 kPa, and that are not required to support an additional uniform dead load from materials heavier than asphalt or wood shingles, wood shakes, built-up, selvage, sheet metal, glass reinforced, hot rubberized asphalt or polyvinyl chloride sheet roofing [see Sentence 9.23.4.5.(1)], and lumber joists used to support ceilings. Exceptions: except: for constructions designed according to Part 4 for the same loading conditions and not exceeding the design criteria for uniform loading and vibration, as stated in Sentence 9.23.4.4.(1), which applies to floors supporting concrete toppings other than described above, and as stated in Sentence 9.23.4.5.(1), which applies to roofs required to support an additional dead load from materials heavier than asphalt or wood shingles, wood shakes, built-up, selvage, sheet metal, glass reinforced, hot rubberized asphalt or polyvinyl chloride sheet roofing.
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Intent	Intent 1: To limit the probability of excessively long spans, which could lead to an inability to resist expected lateral, gravity or wind-uplift loads. Where wood-frame construction supports or is part of an environmental separator, this is to limit the probability of the displacement or failure of required environmental separation elements, which could lead to: condensation, precipitation ingress, excessive heat transfer, pollutant ingress, or compromised thermal performance of components intended to resist heat transfer. This is to limit the probability of: inadequate control of temperatures of interior spaces, drafts, relative humidity or water accumulation, the generation of pollutants from biological growth or from materials that become unstable on wetting, or deterioration, which could lead to further compromised integrity of environmental separators. 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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