A capillary break and vapor barrier should be located under concrete basement floor slabs. Crushed stone or coarse gravel acts as an effective capillary break and sheet polyethylene in direct contract with a concrete floor slab acts as an effective vapor barrier.
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If you have a forced air type heating and cooling system, you should consider testing multiple levels in the home as the radon gas tends to mix more freely throughout the house. So in this case, your radon levels could be nearly as high on the upper floors of the building as the basement.
Sewer gas smell is caused by invisible gas that enters your home from your plumbing pipes. The most common source is dry floor drains. The second-most common source is a bad wax seal under a toilet. DEAR TIM: My daughter's house has a chronic sewer gas smell problem. The odor is strong when it rains
Another common misconception is that the basement is the ONLY area to be radon gas tested. Nothing could be further from the truth. Radon gas levels vary not only from day to day and season to season, but radon gases (radon gas *) can vary significantly from one part of the home to another. Since you probably don't spend 100% of your time in it.
Radon gas accumulates in basements because of low ventilation. Heating and air-conditioning, natural air movement, the "stack effect," as well as diffusion of radon gas through the floors and walls distribute radon throughout the house.