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9.19.1.4.(1)
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Application
Application 1: 
Ventilation of lower portions of mansard or gambrel roofs of 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 exempt from the application of Articles 9.19.1.1. to 9.19.1.3., roof configurations where:
  • heat and moisture transfer into or out of the space (caused by air pressure differences across the building envelope induced by stack effect) is reduced because the lower portion of the roof is close to the neutral pressure plane, and
  • the likelihood of snow accumulation and ice damming is limited.
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