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9.23.4.2.(4)
ApplicationIntent
OS2OP2
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1,OS2.3,OS2.5]
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 built-up lumber ridge beams used to support roofs, where specified snow loads do not exceed 3.0 kPa.
Exceptions: 
except as stated in:
  • Sentence 9.23.13.8.(3), which applies where beams are of material not less than 38 mm by 140 mm and they are supported at intervals not exceeding 1.2 m by not less than 38 mm by 89 mm members extending vertically from the ridge to suitable bearing, and
  • 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, or 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 gravity loads, which could lead to structural collapse, which could lead to harm to persons.
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