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9.13.4.5.(2)
OH1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Lapping of joints in soil gas barriers that are installed below interior floor slabs 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].
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,
    • floors in unenclosed portions of buildings,
    • buildings located where soil gas is at a sufficiently low concentration as to not constitute a hazard, and
  • Sentence 9.13.4.1.(4), which applies to buildings containing a single dwelling unit and provided with a sub-floor depressurization system installed in accordance with Article 9.13.4.6.
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Intent
Intent 1: 
To limit the probability of discontinuity in soil gas barriers, where they are weighed down by a concrete slab [which clamps the joints], which could 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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