One or more suction points through the slab, sealed pipe to above the roofline, and a fan outside the living space. The system most Hunterdon houses get.
It is one of the more common requests we route across Hunterdon County, NJ.
What usually prompts the call
- A finished basement that is used as living space and has never been tested
- A test came back at or above 4.0 pCi/L on a basement or slab home
- Cracks and utility penetrations through a slab you can see daylight around
- A sale is under contract and the buyer's radon result triggered a repair request
The usual approach
The standard fix. A suction point is cut through the slab, pipe is run up through the house or along an exterior wall, and an in-line fan mounted outside conditioned space pulls soil gas from under the floor and discharges it above the roofline. Sizing follows a diagnostic reading of how permeable the fill under the slab actually is, not the square footage of the house.
Typical cost in Hunterdon County, NJ
$1,200 – $2,600 — typical range, not a quote. What your building needs can only be settled by a certified business that measures it on site.
Who is allowed to do this in New Jersey
Under N.J.A.C. 7:28-27 this is not work a general contractor may take on. It requires a business certified by NJDEP for radon mitigation, with a certified mitigation specialist directing the work. We verify that on the state register, note the date, and route accordingly — but a verified certification is a fact, not a recommendation.
Not sure whether your number is a problem?
Write down what the system is doing and what the re-test said. We'll get it to crews who diagnose rather than guess.
Tell us what you've got →Coverage
Where this applies
Grouped by what is under the building, because that is what decides whether this is the right approach at all.
Highlands ridge and limestone valley
Precambrian gneiss and granite of the Reading Prong, cut by carbonate valleys. The highest-potential ground in the county, and almost all of it on private wells.
Newark Basin shale country
Red shale and mudstone of the Passaic Formation under Flemington and the centre of the county. Fractured rock, plenty of basements, and a mix of public water and wells.
Diabase uplands and the Delaware corridor
Sourland-type diabase and the dark argillite of the Lockatong Formation. Stone farmhouses, open crawl spaces, and river-town cellars cut into rock.