ILLINOIS REGISTER 6870
ILLINOIS EMERGENCY MANAGEMENT AGENCY
NOTICE OF PROPOSED AMENDMENTS
B) All joints and connections in radon mitigation systems using 3-
inch by 4-inch metal downspout on the exterior of a building shall
be permanently sealed with appropriate sealants.
CB) Vent stack discharge points shall be directed vertically with no
obstruction in the discharge except for a rodent screen of wire
mesh no smaller than one-fourth inch. Rain caps shall not be
installed on the discharge.
DC) Radon vent pipes shall be fastened to the structure of the building
with hangers, strapping, or other supports that will
permanentlyadequately secure the vent material. Existing
plumbing pipes, ducts, or mechanical equipment shall not be used
to support or secure a radon vent pipe.
ED) Radon vent pipes shall be supported as follows:
i) Supports for radon vent pipes shall be installed at least
every 6 feet on non-vertical runs.
ii) Vertical runs shall be secured either above or below the
points of penetration through floors, ceilings and roofs.
iii) Vertical runs shall be secured at least every 8 feet on runs
that do not penetrate floors, ceilings or roofs.
FE) To prevent blockage of air flow into the bottom of radon vent
pipes, these pipes shall be supported or secured in a permanent
manner that prevents their downward movement to the bottom of
suction pits or sump pits, or into the soil beneath an aggregate
layer under a slab.
GF) Radon vent pipes shall be installed in a configuration that ensures
that any rain water or condensation within the pipes drains
downward into the ground beneath the slab or soil gas retarder
HG) Radon vent pipes shall not block access to any areas requiring
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