Permanently Reduce Radon in Your Toronto Home
Our Active Sub-Slab Depressurization (ASD) systems are custom-designed for each home and backed by a 10-year warranty. Most installations complete in a single day.
What Is Active Sub-Slab Depressurization?
ASD is the most effective and widely recommended radon mitigation method for Canadian homes — endorsed by Health Canada.
- A suction point is created under your slab A small hole is drilled through your basement floor. A pipe is inserted to create a pressure differential beneath the foundation.
- A fan draws radon out continuously A low-energy fan runs 24/7, pulling radon gas from beneath the slab before it can enter your living space.
- Radon is safely vented above the roofline The pipe runs up through the home or exterior wall and exhausts above the roofline, diluting radon harmlessly into the open air.
- Verified by post-installation measurement After installation, we measure your home's radon level using calibrated equipment to confirm the system is performing effectively.
6 Steps to a Radon-Free Home
From first contact to confirmed results — here's exactly what to expect.
- Initial Contact
Contact Us for a Consultation
Call, email, or book online. We'll ask about your home, your radon test results, and your foundation type to understand what's needed before we visit.
- Site Assessment
In-Home Assessment & Custom System Design
We visit your property to assess the foundation, identify the optimal pipe route, and design a system specific to your home's layout and sub-slab conditions. No two systems are identical.
- Installation Day
Core Drilling & Pipe Installation
We drill a precise core through your basement floor to reach the sub-slab material. The PVC pipe is installed and routed through the home or along the exterior to above the roofline.
- Installation Day
Fan Installation & System Sealing
An energy-efficient fan is mounted and connected. All penetrations, cracks, and sump covers are sealed with appropriate sealants to maximize system performance.
- Verification
Post-Installation Radon Measurement
After installation, we measure radon levels using calibrated equipment to confirm the system is achieving the expected reduction. We don't leave until the numbers confirm success.
- Completion
Documentation & 10-Year Warranty
You receive a full written report of pre- and post-installation readings, system specifications, and your 10-year parts and labour warranty. We're available for any follow-up questions.
Works With All Toronto Home Types
Toronto's housing stock spans multiple foundation types. Our systems are designed and adapted for each one.
Poured Concrete Basement
The most common Toronto foundation. ASD works exceptionally well — a single suction point typically achieves excellent coverage across the entire slab.
✓ Ideal for ASDBlock / Stone Foundation
Older Toronto homes often have block or stone foundations. We use interior membrane systems or block-wall depressurization to address radon entry points effectively.
✓ Adapted solutions availableCrawl Space
Crawl space homes require a combination of sub-membrane depressurization and vapour barrier installation. We assess airflow patterns before designing the system.
✓ Sub-membrane system availableBacked by a 10-Year Warranty
- Full coverage on fan, pipe, and all installation components
- Labour included — no call-out fees for warranty repairs
- Post-installation measurement confirms system performance
- Annual check-in available on request
- Transferable to new homeowners upon sale
Mitigation Questions
Common questions about radon mitigation in Toronto homes.