Understanding Systems With Multiple Suction Points

Homes with multiple foundations, or that are particularly difficult to mitigate may combine mitigation techniques.

Figure 1
Notice the mitigation suction pit is off to the right of the sump pit (far left corner). This system is tying in to the crawlspace located in the upper right corner.

Sump Pits

Sump pits may be used as a secondary suction point, but must not be used as the primary suction point for any mitigation system unless the basement of the home being mitigated has radiant heat lines installed in or below the floor.

Although view ports are allowed on sump pit lids, they are no longer a mandatory requirement. The radon vent must include provisions for the removal of the sump lid for maintenance of the sump pump.

Figure 2
Sump pit with viewport and removable boot for maintenance.