Whether block-wall depressurization is the right answer in Frenchtown depends on what is actually under the floor.
What usually prompts the call
- A system that was installed under the slab and only got the reading part of the way down
- A hollow concrete-block foundation wall
- An older block wall with an open top course
Why this comes up in Frenchtown
Here is what makes Frenchtown particular: the village core is on a borough supply; the slope behind it is less uniform. A well there draws from the rock at the western margin of the basin.
Frenchtown Borough — the state's own numbers
30% of the 658 test results NJDEP holds for Frenchtown Borough were at or above the 4.0 pCi/L action level — 195 of them. That puts it in Tier 1 — high potential.
Frenchtown is a riverside borough on the Delaware at the mouth of the Nishisakawick, opposite Uhlerstown in Pennsylvania, and that shapes what a system here has to be designed around.
Practicalities in Frenchtown
Small village lots close to the street; more room on the higher ground behind the centre.
Construction permits go through Frenchtown Borough, and installing radon mitigation for a fee anywhere in New Jersey requires NJDEP certification.
What the work involves
Hollow block walls are a network of interconnected voids running from the footing to the top course, and soil gas uses them as a chimney. Treating them means sealing the top course and drawing suction from inside the cavity, usually alongside a sub-slab system rather than instead of one.
Typical cost in Hunterdon County, NJ
$1,800 – $3,200 — typical range, not a quote. What your building needs can only be settled by a certified business that measures it on site.
What it costs comes down to the foundation, the number of suction points, and where the pipe can run.
Certification, checked before referral
Installing radon mitigation for a fee in New Jersey requires NJDEP certification as a radon mitigation business, affiliated with a certified radon mitigation specialist (N.J.A.C. 7:28-27). We confirm that on the NJDEP register and record the date we checked. That is a check, not an endorsement — satisfy yourself before you hire.
Have a result you don't know what to do with?
One description is enough. We'll send it to certified local crews and leave the decision entirely with you.
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Other things that come up here
Other work in Frenchtown
Same ground, different question.
Block-wall depressurization nearby
Neighbouring towns on the same ground.