How Radon Enters Your Home
The level or radon in a home depends on how easily the radon can be transported into the building through the soil, permeability, pathways and openings into the building. Building vacuums (stack effect) or soil pressures cause air from the soil to enter through foundation openings. Soil gas enters all buildings. If there is radon in the soil, radon enters with the soil gas. This is the most common entry point.