Sub Slab Depressurization
Any concrete basement area is considered a sub-slab depressurization area. The sump pump and nearly all cracks need to be sealed with the proper sealants to achieve the lowest radon level. In any unfinished basement, all lose items against the exterior walls need to be away from the wall so that a technician can seal the concrete gap between the floor and concrete/ block wall.
❓ What Is a Sub-Slab Radon System?
A sub-slab system is a radon mitigation approach that targets the soil and air directly beneath your home’s concrete slab foundation. A pipe and fan assembly creates a vacuum below the slab that draws radon gas away from indoor spaces and vents it safely outdoors, effectively reducing indoor radon concentrations.
🛠️ How Does Sub-Slab Depressurization Work?
A small hole is drilled through the slab into the soil or crushed stone beneath. A PVC pipe connected to a fan pulls air from under the slab, creating negative pressure that prevents radon from entering the living space. The fan runs continuously to maintain this pressure change and keep radon levels low.
📍 Why Is Sub-Slab Mitigation Common for Slab-On-Grade Homes?
Homes with slab foundations typically have soil directly beneath the concrete where radon gas originates. Sub-slab depressurization is the most reliable method for this setup because it directly intercepts and redirects soil gas before it enters the home.
🧩 Do All Sub-Slab Systems Look the Same?
While the core principle is the same, system design can be tailored. Some installations draw from a single suction point, and others use multiple points depending on soil conditions and foundation size. A qualified installer evaluates these factors to ensure the system is effective.
📈 How Effective Is a Sub-Slab Radon System?
When properly designed and installed by experienced professionals, sub-slab depressurization systems can significantly lower radon levels and improve indoor air quality, making your home safer long-term.