Older foundations need thorough sealing
The pressure field only works if the fan is drawing from beneath the slab rather than out of the basement. Sealing is what makes that true.
York County, Pennsylvania
Radon guidance for Hanover, in the western corner of York County near the Adams County line.
Call (717) 555-0143Hanover sits at the western edge of York County against the Adams County line, and it is one of the larger population centres in the area. Its housing runs from a dense older borough core out to newer surrounding development, which produces the same wide spread of foundation types and construction eras found elsewhere in the county.
For older borough properties, the sealing component of a mitigation system tends to matter more than average. A century-old foundation typically has a floor-to-wall joint, a sump or drain, and assorted penetrations that all allow the mitigation fan's pressure field to bleed away. Sealing those is not cosmetic work — it is what lets a modestly sized fan do its job across the whole slab instead of pulling air from the basement.

The pressure field only works if the fan is drawing from beneath the slab rather than out of the basement. Sealing is what makes that true.
Large or segmented slabs sometimes need more than one. Ask any contractor to justify the number they propose.
Hanover sits against the Adams County line and contractors work both sides of it. Pennsylvania DEP certification applies statewide — check the list regardless of which county the firm is based in.
On an old borough foundation, the post-mitigation number is largely a verdict on how thoroughly the sealing was done. It is the check that matters most here.
Independent guidance on radon testing, mitigation costs and DEP-certified contractors for homeowners in Hanover and the surrounding parts of York County.
Ask about a test result, what a Hanover mitigation quote should include, or how to check a contractor’s DEP certification.