Can a fireplace make radon levels in my house worse?
Yes, and Flat Rock's historic homes are close to a worst case for it. Those 1800s houses were built with oversized open masonry fireplaces and clay flue liners that draw enormous volumes of indoor air up the chimney, and the house replaces every bit through the slab and foundation, radon included. Henderson County reads high, so test — then look hard at that grand old firebox.
The bigger the open firebox, the bigger the pull
An oversized open hearth is the strongest radon-pulling appliance a home can have. It can send hundreds of cubic feet of household air up the flue every minute it burns, and in Flat Rock's oldest homes those fireboxes are enormous by modern standards. The house has to make that air up somehow, and the quickest supply is the ground beneath it — up through slab cracks, the crawl, and the seams around a settling foundation. Charm and radon pull come from the same wide-open design.
A sealed insert saves the character and stops the draft
You don't have to lose the mantel or the surround to fix this. Dropping a [sealed gas insert](/services/wood-to-gas-conversion) into that historic opening closes off the wide flue, ends the cold-air draft these old hearths pull into the room, and stops the fireplace from fighting the house for air. Aging clay liners that are cracking anyway make the case stronger — a sealed insert with a proper liner solves the safety and the radon pull in one move.
Test, then fix the pieces in order
Radon mitigation itself — the sub-slab pipe and fan — is a separate specialty, not something we install. The fireplace's share is ours, and as a licensed gas contractor we permit the work with Henderson County and pressure-test the line. Put a test kit on the lowest floor you use first; if it reads high, run the mitigation and the hearth conversion together. We're 30 minutes south of the Asheville showroom. Call (828) 545-0525.
Fireplace help in Flat Rock
We install and service fireplaces throughout Flat Rock and the rest of Henderson County — just 30 minutes south from our Asheville-area showroom.
Related questions
- Does a fireplace pull air out of my house, and does that matter for air quality?
- Do fireplaces cause more air quality problems in tightly sealed new-construction homes?
- Can an unused fireplace or chimney cause moisture and mold problems in the house?
- Why do I smell smoke in my house when the fireplace isn't even burning?
- Do fireplaces create dust in the house?