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9.13.4.6.(4)
OH1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Seals for soil gas extraction pipes installed through interior floors that are in contact with the ground, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that contain a single dwelling unit that is provided with a means to install a sub-floor depressurization system.
Exceptions: 
except as stated in Sentence 9.13.4.1.(2), which applies to the control of the infiltration of soil gas in:
  • floors in garages, and
  • buildings located where soil gas is at a sufficiently low concentration as to not constitute a hazard.
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Intent
Intent 1: 
To limit the probability that open and unconnected soil gas extraction pipes will lead to the infiltration of soil gas (particularly radon), which could lead to negative effects on the air quality of indoor spaces, which could lead to harm to persons.
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