// CODE SNIPPET
AF103.3 Basements or Enclosed Crawl Spaces With Soil Floors
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In dwellings with basements or enclosed crawl spaces
with soil floors, the following components of a passive submembrane
depressurization system shall be installed during
construction.
Exception: Basements or enclosed crawl spaces that are
provided with a continuously operated mechanical exhaust
system in accordance with Section R408.3.
The soil in basements and
enclosed crawl spaces shall be covered with a soil-gasretarder.
The soil-gas-retarder shall be lapped not less than
12 inches (305 mm) at joints and shall extend to foundation
walls enclosing the basement or crawl space. The soilgas-
retarder shall fit closely around any pipe, wire or other
penetrations of the material. Punctures or tears in the
material shall be sealed or covered with additional sheeting.
A 3- or 4-inch "T"
fitting shall be inserted beneath the soil-gas-retarder and
be connected to a vent pipe. The vent pipe shall extend
through the conditioned space of the dwelling and terminate
not less than 12 inches (305 mm) above the roof in a
location not less than 10 feet (3048 mm) away from any
window or other opening into the conditioned spaces of
the building that is less than 2 feet (610 mm) below the
exhaust point.
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