Exposure Category D: When to use it
Since TDI adopted the 2018 International Building Code and 2018 International Residential Code, we’ve gotten questions about the appropriate use of Exposure Category D with ASCE 7-16 and the 2018 IBC/IRC. The 2018 IBC/IRC uses the ASCE 7-16 as the most common reference.
The new ASCE requires designers to include Exposure Category “D” as a modifier to design wind pressures in U.S. hurricane regions. This requirement means the exposure condition of beachfront structures must be evaluated for Exposure Category “D” and increases wind pressure requirements of the structure. This requirement was first published in the ASCE 7-10 standards.
Windstorm inspectors must evaluate structures certified to the 2018 IBC/IRC requirements to determine whether Exposure Category “D” is applicable.
Getting to know the Coastal Barrier Resources Act
Congress passed the Coastal Barrier Resources Act (CBRA) in 1982. The act excluded relatively undeveloped areas on the Gulf and Atlantic coasts from receiving federal spending and aid. This change eliminated flood insurance coverage and made private developers bear the full cost of development.
Changes to CBRA are made by Congress. The U.S. Fish and Wildlife Service (FWS) maintains CBRA maps and other information, and determines which properties are included in CBRA zones. Although FEMA’s federal insurance rate maps have shown CBRA zones, they are not updated as quickly as the digital maps at FWS.
Updated windstorm forms
We’ve updated our windstorm forms to make them more consistent and easier to use. Please make sure your submissions are on the new forms. Using old forms could delay project certification.
Questions?
Call or email the Windstorm intake team at 800-248-6032, option 3, or windstorm@tdi.texas.gov.
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