Hunterdon County · 25 of 26 towns NJDEP Tier 1 Action level 4.0 pCi/L Free for homeowners — paid by the crews
Hunterdon RadonTesting & mitigation

Hillsborough, Hillsborough Township, Somerset County

Crawl space sub-membrane depressurization in Hillsborough

Sealed membrane over an open crawl-space floor with suction drawn beneath it. The right system when there is no slab to cut through.

Whether crawl space sub-membrane depressurization is the right answer in Hillsborough depends on what is actually under the floor.

How this normally comes up

  • A crawl space that smells of soil no matter the season
  • Insulation and ductwork in a crawl the ground is open to
  • A dirt-floored or stone-walled crawl space under an older farmhouse

Why this comes up in Hillsborough

The subdivisions and the mountain are not on the same supply. A well on the Sourland side draws from the diabase — the same rock that limits how far suction travels under a slab.

Hillsborough Township, Somerset County — the state's own numbers

32% of the 11,654 test results NJDEP holds for Hillsborough Township, Somerset County were at or above the 4.0 pCi/L action level — 3,785 of them. That puts it in Tier 1 — high potential.

Hillsborough is the large Somerset County township east of Hunterdon, running from the Sourland ridge down across the Millstone valley, and that shapes what a system here has to be designed around.

Getting the work done in Hillsborough

Suburban lots with good access; the mountain properties are wooded and more constrained.

Any permit for this runs through Hillsborough Township, Somerset County. NJDEP radon certification has to be current before a business receives anything from us.

What the work involves

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.

A crew that works Hillsborough Township, Somerset County regularly will have met this pattern before.

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.

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.

Get quotes in Hillsborough →

Related

Other things that come up here

Other work in Hillsborough

Same ground, different question.

Crawl space sub-membrane depressurization nearby

Neighbouring towns on the same ground.