Radon mitigation is the process of reducing radon gas levels in a home to make indoor air safer. The most common method is sub-slab depressurization, which uses a venting system and fan to redirect radon from beneath the home to the outside.
Types of Depressurization in Radon Mitigation
Depressurization is a common radon mitigation technique that reduces radon levels by creating lower pressure beneath a building, preventing the gas from entering. Here are the main types:
1. Sub-Slab Depressurization (SSD)
Best for
Homes with concrete slab foundations
How It Works
A vent pipe is inserted through the slab into the soil beneath, and a fan pulls radon gas from below the home, venting it safely outside.
Effectiveness
The most common and effective method for reducing radon in basements and slab-on-grade homes.
2. Sub-Membrane Depressurization (SMD)
Best for
Homes with crawl spaces
How It Works
A vapor barrier (plastic sheeting) is installed over the soil, and a pipe and fan system draws radon from beneath the membrane and vents it outside.
Effectiveness
Highly effective for crawl spaces when properly sealed.
3. Drain Tile Depressurization (DTD)
Best for
Homes with drain tile or perforated pipe systems around the foundation
How It Works
The existing drain tile system is used to collect radon gas, which is then vented outside with a fan-assisted system.
Effectiveness
Works well when drain tiles are accessible and not water-clogged.
4. Block Wall Depressurization (BWD)
Best for
Homes with hollow block foundation walls
How It Works
A pipe and fan system removes radon that accumulates inside the hollow walls, preventing it from seeping into the home.
Effectiveness
Useful for homes with high radon levels originating from block walls.
Each method is chosen based on a home’s foundation type and radon entry points. A professional radon test can help determine the best mitigation approach for your home!