Technical Bulletin 3, Non-Residential Floodproofing Requirements and Certifications

This bulletin provides detailed guidance on the design, certification, and regulatory requirements for dry floodproofing of new and substantially improved non-residential and mixed-use buildings in Special Flood Hazard Areas (SFHAs) under the National Flood Insurance Program (NFIP). It addresses planning considerations, compliance with building codes and standards such as ASCE 24 and the International Building Code, and the process for obtaining floodproofing certification. The document includes step-by-step procedures for evaluating flood hazards, determining flood loads, designing structural and utility system resistance, and preparing required documentation for NFIP compliance and insurance rating. It is intended for professionals involved in the design, review, and approval of flood-resistant construction for non-residential and mixed-use buildings.