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 Washington Administrative Code (Last Updated: November 23, 2016)
 Title 51. Enterprise Services, Department of (Building Code Council)
 Chapter 51-51. State Building Code adoption and amendment of the 2015 edition of the International Residential Code.

  Section 51-51-60101. Appendix F radon control methods.  

Latest version.
  • AF101.1 General. This appendix contains requirements for new construction in jurisdictions where radon-resistant construction is required.
    Inclusion of this appendix by jurisdictions shall be required in high radon potential counties as determined in Figure AF101 and as listed in Table AF101(1).
    Unvented crawl spaces are not permitted in any high radon potential county. In other areas, requirements of this appendix apply to any structure constructed with unvented crawl spaces as specified in R408.3.
    TABLE AF101(1) HIGH RADON POTENTIAL (ZONE 1) COUNTIESA
    WASHINGTON: Clark, Ferry, Okanogan, Pend Oreille, Skamania, Spokane, Stevens.
    a. EPA recommends that this county listing be supplemented with other available state and local data to further understand the radon potential of Zone 1 areas.
    [Statutory Authority: RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-60101, filed 12/19/06, effective 7/1/07.]
    Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.
RCW 19.27.074, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 07-01-090, § 51-51-60101, filed 12/19/06, effective 7/1/07.