Radon mitigation & testing in Merrimack, NH

New construction in Merrimack

Building, or just bought a newer home in Merrimack? New homes are not automatically low in radon. Here’s how radon-resistant construction works and what to do if a new home tests high.

Radon-resistant new construction (RRNC)

RRNC typically includes a gas-permeable layer under the slab, plastic sheeting, sealed openings, and a vent pipe from below the slab to the roof. (EPA) Ask your builder whether these are included.

If a new home tests high

A passive vent pipe can often be “activated” by adding a fan. The EPA notes that building these features in at construction makes it easier and less expensive to reduce radon further if passive measures aren’t enough. (EPA)

Existing homes

For older Merrimack homes, the usual fix is sub-slab depressurization. See how mitigation works.

Test either way

Every home should be tested; NH residents can get a free state kit. (NHDES)

Nearby

See also Nashua and Manchester.