Radon Huntsville › Services › Sub-Slab Depressurization
Radon Huntsville gets Huntsville homeowners free quotes on sub-slab depressurization systems, installed by a certified local contractor. It's the most widely used radon mitigation method for homes on slabs and basement floors.
The idea is simple: lower the air pressure under your slab slightly so radon in the soil flows into a pipe and out above your roof instead of through cracks into your home.
How it works
A contractor cores a hole, usually a few inches across, through the slab and removes a small pit of soil or gravel underneath to improve airflow. A PVC pipe is sealed into the hole and runs to an inline fan, which pulls soil gas up and exhausts it above the roof line. Because the fan is outside the living space, any leak in the pressurized side of the pipe stays outdoors.
Interior or exterior pipe routes
Interior route
The pipe runs up through a closet or utility space into the attic, where the fan is mounted, then out through the roof. It's mostly hidden and protected from weather.
Garage route
Common in Huntsville-area homes with attached garages. The pipe runs through the garage wall or ceiling to a fan in the garage attic.
Exterior route
The pipe exits the side of the house to a fan mounted outside, then runs up the wall above the eave. It's simpler to install and is often painted to match the siding.
When one suction point isn't enough
Homes with additions, multiple slab levels or dense fill under the slab sometimes need more than one suction point. Many contractors run a quick test called pressure field extension (diagnostic testing) to see how well suction spreads before deciding.
Frequently asked questions
Does sub-slab depressurization damage the foundation?
No. The hole is small and sealed around the pipe. It doesn't affect the slab's strength.
Where does the fan go?
Outside the living space, usually in the attic, the garage, or on an exterior wall.
Related services
Radon Mitigation
Permanent systems that lower radon in your home below the EPA action level.
Basement Radon Mitigation
Radon systems for full and walk-out basements common on Huntsville's hillsides.
Radon Fan Replacement & Repair
Fix or replace a failed radon fan and get your system working again.
Radon Testing
Professional radon tests and help choosing the right test for your home.
Sub-Slab Depressurization near Huntsville
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