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The 2017 DC Construction Codes Supplement, based on the 2015 I-Code Family, including the 2015 IBC, was adopted on 5/21/2020 and became effective upon publication in the DC Register on 5/29/2020. DC has adopted Appendix G – Flood-Resistant Construction. DC strengthens wind-resistance through new Section 1609.1.1.2, increasing several minimum design wind load thresholds from 16psf to 30psf. DC strengthens flood-resistance through new Section 1612.4.1, requiring lowest floor elevation and floodproofing to be BFE+2ft or 500yr flood elevation, whichever is higher. DC has begun reviewing the 2021 I-Codes for adoption by 2023. (3/16/2021)