radon sealing sump pit 10

https://alpha-wiki.win/index.php/Why_You_Need_a_Trusted_Radon_Contractor_for_Your_Home_in_York_and_Adams_County

To keep radon from seeping into the house, the sump pit under the basement floor gets sealed off. It’s more than just covering it; a pro usually coats the pit walls and floor with a thick waterproof and radon-resistant sealant, then puts a tight lid with gaskets. This creates a barrier so the gas can’t migrate from the soil into the indoor air, which is key for healthy living spaces.