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» 1.2 Layer of aggregate or sand (4 in.) with geotextile matting installed below slabs AND radon techniques used in EPA Radon Zone 1
1.2 Layer of aggregate or sand (4 in.) with geotextile matting installed below slabs AND radon techniques used in EPA Radon Zone 1
To comply with the Indoor airPLUS and Zero Energy Ready Home programs, a layer of aggregate or sand with geotextile matting must be installed below slabs AND radon techniques must be applied in EPA's Radon Zone 1.
The following Solution Center Guides provide more information about these measures: