Best Way to Seal Rubble Foundation Against Water and Radon?
Hi, I am new here, hoping someone can help. We have a 200 year old house with a rubble foundation. It is structurally sound, but there are lots of gaps, cracks, and small loose stones that allow water in during heavy rain. That's fine, but we've recently learned we have a radon problem that cannot be fixed until the foundation is sealed. What would be the most efficient and reliable way to do this? Repointing would be very expensive and we'd still need to coat the stone faces with sealant. Could we apply Shotcrete, gunite, or closed cell spray foam directly to the un-mortared walls? (We will repoint the exterior and work on better drainage to keep water away.) Thanks for any insight!