Active Sub-Slab Depressurization — Ohio’s Most Effective Radon Fix
ASD is the EPA-recommended gold standard for radon mitigation in Ohio basements. It draws radon from beneath your foundation before it ever enters your home — and results are guaranteed below 4.0 pCi/L.
ASD creates a low-pressure zone beneath your concrete slab. Because radon flows from high pressure to low, the system draws it out of the soil before it seeps through cracks or joints into your home. A small, continuously running fan vents the captured radon safely above the roofline.
How it works
Diagnostic pressure field test
We test sub-slab material to confirm adequate suction can be created — ensuring one point will cover the entire slab area before any drilling.
Precision suction point installation
Carl cores a 3–4 inch hole through the basement slab at the optimal location — where sub-slab material provides the best connection.
PVC pipe and routing
Schedule-40 PVC pipe is inserted and routed through the interior or along the exterior foundation wall, up to the roofline.
Radon fan connection
A low-voltage, continuously running radon fan connects inline — drawing radon from beneath the slab and exhausting it safely above the roofline.
Post-installation verification
A follow-up radon test confirms levels are below 4.0 pCi/L. Every installation is backed by Carl’s written guarantee.
Key benefits
Highly effective
ASD consistently achieves 50–99% radon reduction. Most Ohio homes see post-mitigation levels well below 2.0 pCi/L.
Low operating cost
The radon fan uses roughly the same electricity as a 30–75 watt light bulb — typically $5–$15/month.
No disruption to daily life
The system runs silently in the background. Once installed, most homeowners forget it’s there.
Long system lifespan
Quality radon fans run 24/7 for 5–10+ years. Replacement fans are affordable and quick to swap.
Transferable benefit
A documented, professionally installed ASD system is a selling point — particularly in Ohio’s active real estate market.
Works in all seasons
Unlike ventilation approaches, ASD performs consistently year-round regardless of weather or window usage.
Ready to get started?
Free estimates with no obligation. We respond within 24 hours.
Common questions
Does every Ohio home need the same ASD system?
No. System design varies based on foundation type (poured concrete vs. block), slab area, sub-slab material, and fan routing. Carl assesses every home individually before recommending a design.
Will I hear the fan running?
Quality radon fans are very quiet — comparable to a range hood on its lowest setting. Most homeowners can’t hear it from the main floor.
Does the ASD system affect my heating and cooling?
A properly designed system draws from beneath the slab, not conditioned interior air. There is minimal HVAC impact. Carl’s diagnostic test ensures sub-slab air is being pulled, not indoor air.
What happens if the fan fails?
Many systems include a visual pressure gauge (manometer) that shows at a glance whether the system is running. If the fan fails, replacement is typically under $200 and covered by the manufacturer warranty.
Can ASD be installed in any Ohio home?
ASD works in virtually all Ohio basement homes. For slab or crawl space homes, Carl uses modified approaches: slab depressurization or crawl space encapsulation and ventilation.
Active Sub-Slab Depressurization for your Ohio home?
Free estimates, honest guidance, and guaranteed results from Ohio’s trusted radon professionals.
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