Radon-Resistant Construction Requirements
Washtenaw County enforces Appendix F of the 2003 Michigan Residential Code. This appendix requires residential construction projects to be built using methods that limit the entry of radon gas into the structure.
Radon is a tasteless, colorless, odorless gas that can seep into homes through cracks in the foundation, sump pump crocks, hollow block walls, or other openings. Long-term exposure to radon is the second-leading cause of lung cancer in the United States. Washtenaw County has been designated a "Zone 1 County", meaning homes built here have the highest potential for elevated radon levels due to the County's geology and soil composition.
Appendix F requirements have been shown to help lower indoor radon levels, protecting the public from exposure to this potentially deadly gas.
For more information:
Washtenaw County's Radon Information Page