Sealed membrane over an open crawl-space floor with suction drawn beneath it. The right system when there is no slab to cut through.
This comes up often enough here that most certified crews in the county have a settled way of handling it.
How this normally comes up
- Insulation and ductwork in a crawl the ground is open to
- A crawl space that smells of soil no matter the season
- A reading that stays high in a house with no slab to work through
- A dirt-floored or stone-walled crawl space under an older farmhouse
What a certified crew will do
Where there is no slab, the ground itself becomes the barrier. Reinforced membrane is laid over the crawl-space floor, sealed to the walls and around the piers, and a suction point beneath it is piped to a fan. Sealing quality is the whole job here — a membrane taped at the seams and left loose at the wall performs nothing like one properly terminated.
Typical cost in Hunterdon County, NJ
$2,000 – $3,800 — typical range, not a quote. What your building needs can only be settled by a certified business that measures it on site.
The credential behind this work
New Jersey licenses this work specifically: a certified radon mitigation business, affiliated with at least one certified radon mitigation specialist. We check the NJDEP register before a crew receives anything from us and we log when we checked. Certifications lapse, so ask to see a current one before you sign anything.
Want a quote before the closing date?
One description is enough. We'll send it to certified local crews and leave the decision entirely with you.
Tell us what you've got →Coverage
Towns where this is the right question
These are the towns whose geology and housing stock actually put this on the table.
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.