Any weather safe room constructed on or after January 1,2017, shall be designed and constructed in compliance with the provisions of ICC 500-2014, ICC/NSSA Standard for the Design and Construction of Storm Shelters, published by the International Code Council, 500 New Jersey Avenue NW, 6th Floor, Washington, D.C. 20001. Any provision which would apply to a hurricane safe structure but not to a tornado safe structure shall not apply. For any provision for which a distinction is made between a tornado safe structure and a hurricane safe structure, the requirement for a tornado safe structure shall apply.
Iowa Admin. Code r. 661-315.3