Here are all the possible radon mitigation methods for an existing home. If you are planing to build a new home minimize the level of radon gases within your home by using a Radon Resistant Construction Technique.
Sealing radon entryways is a simple solution with the main goal of preventing radon gases from getting inside the home by sealing all the possible entry paths. Caulking basement floor cracks, covering bare crawlspace floors with plastic, coating basement walls and basement floors with deap sealing compounds or cement paint, installing and sealing caps on sump pump holes and open drains can dramatically lower radon levels.
Removing radon gases from the soil underneath the home is a bit more complex and has the greatest effect on your home's environment. A popular radon mitigation method uses a low volume ventilation fan, known as in-line radon fan, which pumps air from beneath the basement floor. This radon mitigation method, also referred to as Sub-slab depressurization technique, has been found to be the most effective so far. By installing an In-Line Radon Fan along with a vent pipe a fan-based radon mitigation system gets built. The system creates low pressure under the basement slab and pumps radon gases from underneath the home via plastic pipe to a vent located at the roof line. This radon mitigation method is recommended to be used in conjunction with sealing and caulking all the openings in the concrete foundation floor and radon entry routes.
Alternately, a fan based Block-wall suction system is suitable for basements with hollow block walls while a fan based Drain-tile suction system works best for basements with drain tiles. For increased efficiency, both radon mitigation systems should be complemented by sealing and caulking all the openings in the concrete foundation floor and radon entry routes.
Basement pressurization will create a higher pressure within the basement and prevent radon gases from getting in and it is usually used in conjunction with sealing and caulking all the openings in the concrete foundation floor and radon entry routes.
Venting radon gaseses out of the home is well suited for unused basements and crawl spaces. Radon levels can be significantly reduced if the unused basement or crawl space is naturally ventilated after being isolated from the living area of the home with vapor barriers and adecquate insulation. This radon mitigation method is not economical for the whole-house because of increased heating and cooling costs.
Alternately, Heat Recovery Ventilation System may decrease the level of radon in your home, in addition to providing fresh air. As in the previous radon mitigation method, getting the radon gases out of the home by either naturally or mechanicaly ventilating the home alone is only recommended for low radon levels around 5 piC/l. It is recommended to use radon gases venting in conjunction with the sealing out radon gases method. This way radon gases levels around 6 piC/l may be successfully mitigated.
If you are building a new home, here are typical radon-resistant construction techniques which will definitely minimize the risk of getting radon in your home: