Sump and crawlspace sealing

Airtight sump lids, sealed floor cracks and membrane over dirt crawlspaces.

An open sump pit is one of the easiest ways for radon to get into a basement. A sealed, gasketed lid with a clear view port keeps the pump accessible and the gas out. The sump can often be tied into the mitigation system.

Crawlspaces with a dirt or gravel floor get a heavy polyethylene membrane, sealed at the seams and walls, with the fan drawing from underneath.

Floor cracks, the gap at the wall and pipe penetrations are sealed as part of every system. Sealing alone rarely brings a high reading under the guideline, so we do it together with depressurization.