Rough-in design & install
Gas-permeable layer, sealed barrier details, correctly placed and labelled 4-inch rough-in, with a planned route to an exterior discharge.
For builders & developers
Radon compliance without the callbacks
Since 2025, every new Part 9 home in Ontario needs a soil gas barrier and a sub-slab depressurization rough-in, and Tarion covers radon remediation for seven years. We help you get the rough-in right the first time, test where it counts, and activate fast when a home needs it.
Builder services
One radon partner from footing to year seven
Inspection & documentation
Pre-pour and pre-drywall checks with photos, so inspectors, site supers and future owners all have a clear record.
Activation on request
Fan, manometer, labelling and sealing on a rough-in, usually in a few hours, scheduled around closings and occupancy.
Homeowner testing program
We contact buyers before their first heating season and run a C-NRPP long-term test. A visible, low-cost trust builder.
Warranty-period callbacks
Homeowner reports radon? We test, activate or mitigate, and document the file for your customer care team and Tarion.
Subdivision data
Aggregate results by phase and lot to decide, with evidence, whether to make active systems standard in a community.
Why it pays
A rough-in done right is a two-hour fix. Done wrong, it’s a warranty file.
The difference between a quick activation and a difficult retrofit is decided before the slab is poured: a continuous gas-permeable layer, a sealed barrier, a pipe in the right place, and a clear route to the outside. We make those details routine for your crews.
- Fewer radon calls in the 7-year warranty window
- Consistent documentation across sites and trades
- A homebuyer story you can market: tested, documented, radon-ready
- One certified partner from Windsor to Brantford
How a builder program works
- Plan review
We review slab and foundation details against OBC 9.13.4 and SB-9.
- Install or inspect
Our crew installs the rough-in, or we inspect and photograph yours.
- Close with documentation
A one-page radon insert for the homeowner package.
- Test after occupancy
Long-term tests in the first heating season, coordinated with buyers.
- Activate if needed
Fast, tidy activation and a follow-up test, documented for your files.
Questions
Builder FAQ
Do Ontario builders have to test new homes for radon?
The 2024 Ontario Building Code doesn’t require builders to test. It requires a soil gas barrier and a rough-in for a future sub-slab depressurization system. Testing is up to the homeowner, but Tarion’s warranty covers radon remediation above 200 Bq/m³ for seven years, so a testing program reduces surprises.
What does activating a radon rough-in involve?
Uncapping the rough-in pipe, extending it to a fan located outside the living space, routing the discharge outdoors, adding a manometer and labels, and sealing obvious entry points. With a well-executed rough-in, it’s usually a few hours of work.
Can you install rough-ins, or just inspect them?
Both. We can install the gas-permeable layer, pipe and labelling as a trade, or inspect and document your crew’s work before the slab pour and before drywall.
Do the radon requirements apply to Part 3 buildings?
The 2024 OBC links the sub-slab rough-in requirement to Part 9 buildings. Larger Part 3 projects still need soil gas control through air barrier provisions. We can consult on approach and testing for multi-unit and mixed-use projects.
Which municipalities do you cover?
All of Windsor-Essex, Chatham-Kent, Lambton, Huron-Perth, Waterloo Region, London, Middlesex, Elgin, Oxford, Norfolk and Brant.