WHY DOES RADON BECOME TRAPPED IN A HOME? It's all about air pressure. Usually, a home's inside air pressure is lower than the soil around a building's foundation. In effect, the house acts like a vacuum, drawing radon in through cracks and other openings. The structure then traps the gas inside our well-insulated homes, where you and your loved ones work, play and sleep.
Important: Elevated levels of radon have been found in all kinds of US homes: new, old, well-sealed, drafty, with/without basements. (Construction materials and the way the home has been built may also affect radon levels. Seasons affect levels as well.) Studies show that radon gas in the soil may be as much as 10 times higher in the winter than summer.