Active Soil Depressurization  This is by far the most commonly installed system in the Northeast. A three to five inch hole is cored through the concrete slab, sometimes in more than one location. Five to ten gallons of sub-slab material (sand, gravel, etc.) is then excavated through the hole. This creates a suction point. Special PVC piping is then installed and run above the roof line. This may be done through closets in the house, interior walls, through a garage or any of a hundred-plus other routes. The pipe is attached to the intake side of a radon specific exhaust/suction fan which is mounted in a non-livable area of the building. Additional piping is then connected to the output side of the fan and terminates outdoors, above the roofline. All contributing cracks and holes in the floor are sealed with a poly-based sealant. When the system is activated, the fan suction creates a negative pressure field below the slab and draws radon gas to the suction pit and up the pipe before it can enter the living space. The radon gas is then exhausted to the outside air where it quickly dissipates. A passive system monitor is installed on the system that indicates the system is functioning. We can optionally install an active monitor that will alert you to a system malfunction.

Sub-Membrane Depressurization  Sub-membrane systems are installed in buildings that have a crawlspace or basement with a dirt floor or other material such as ledge-cropping. This system is a network of special perforated pipe placed along the surface of the floor. The entire floor is covered a polyethylene or rubber vapor barrier. A single pipe exits the barrier. A damper is installed within the pipe to regulate airflow. The remaining system is identical to the sub-slab system.