At least one four to six inch hole is cored (drilled) through the slab. A small pit is hollowed out beneath the hole, and a PVC pipe is inserted. This pipe is routed to a fan that creates a vacuum beneath the slab. The number of suction points depends on the permeability of the soil beneath the slab and the number of footings within the building.
This will be similar to a slab on grade installation. At least one four to six inch hole is cored (drilled) through the slab in the basement. A small pit is hollowed out beneath the hole, and a PVC pipe is inserted. This pipe is routed to a fan that creates a vacuum beneath the slab. The number of suction points still depends on the permeability of the soil beneath the slab and the number of footings within the building.
A high density polyethylene sheet is laid on the soil. The seams are sealed, and the edges are sealed to the foundation walls. A perforated pipe or drain mat may be placed beneath the plastic. This pipe is typically connected to solid PVC piping and fan, which creates a vacuum beneath the plastic. This effectively collects the radon and exhausts it to a safe location outside.