New Construction Radon-Resistant Systems in Pocatello, ID

Pocatello is in a growth phase. Large residential developments are actively building out the West Bench, including projects like McCormick Ranch and Trail Creek that will add hundreds of new single-family homes and multifamily units over the coming decade. Newer subdivisions in the Highland and East Bench neighborhoods continue expanding. For anyone building or buying new construction in Pocatello, radon-resistant construction is a question worth asking your builder about, because it's cheap when built in and expensive to retrofit later.

Every new home going up in Bannock County is being built on soil that produces radon. The average measured level in the county sits around 7.0 pCi/L. Building radon-ready construction into new Pocatello homes is genuinely good practice.

Radon-resistant new construction builds several coordinated components into the home during construction: a gas-permeable layer of clean aggregate or a permeable mat under the slab before the concrete pour, a polyethylene vapor barrier over the aggregate, sealed at all penetrations and edges, sealed foundation openings (plumbing penetrations, sump pit connections, expansion joints), and a 3- or 4-inch PVC vent pipe run from the sub-slab layer up through the interior of the home, exiting above the roofline. The system is called passive because it relies on natural airflow, the stack effect of warmer air rising through the vent pipe as the home is heated, to move radon out of the sub-slab area continuously. In many new Pocatello homes, a well-designed passive system reduces indoor levels enough on its own that no active fan is ever needed. The critical thing is that the rough-in exists in the house from day one.

Once a new Pocatello home is finished and lived in through a full closed-house season, you run a radon test. If levels come back below 4.0 pCi/L, the passive system is doing its job and nothing else needs to happen. If levels come back at or above 4.0, activating the system is straightforward and inexpensive: an inline radon fan is added to the existing vent pipe, typically in the attic. The passive system becomes an active one without any retrofit work to the foundation. Activation runs a few hundred dollars because the pipe rough-in is already there; a full retrofit mitigation on a finished home with no rough-in runs $1,500 to $3,000 or more and involves cutting into a finished foundation.

For custom home builders and buyers, ask the question specifically: does your standard build include a passive radon-resistant rough-in? If not, request it as an add. Radon-ready construction is also becoming a resale advantage in Pocatello. Health-conscious buyers ask about it, and a newer home with radon rough-in already installed is easier to test, easier to mitigate if needed, and more marketable than one with no radon planning.