BEFORE RADON MITIGATION
In a typical house prior to radon mitigation, the air pressure in the basement is slightly lower than the air pressure under the basement floor. This pressure differential influences sub-slab vapors to enter the house, through openings, cracks and by diffusion.
AFTER RADON MITIGATION
After mitigation, the pressure characteristics are reversed. Soil vapor is diverted to the atmosphere. Sealing enhances the performance of the vacuum system.