3. Flood Openings per Enclosed Area . If a building has more than one (1) enclosed area, each enclosed area must have flood openings to allow floodwaters to automatically enter and exit.
4. Maximum Height . The bottom of all required flood openings shall be no higher than 1 foot above the adjacent grade.
5. Covering . Flood openings may be equipped with screens, louvers, or other covering or devices, provided that they permit the automatic flow of floodwaters in both directions. 6. Flexible Skirting . Enclosures made of flexible skirting are not considered enclosures for regulatory purposes, and therefore do not require flood openings. Masonry or underpinning, regardless of structural status, is considered an enclosure and require flood openings as outlined above.
E. Additions/Improvements (Flood Insurance Rate Maps) . The following regulations shall apply:
i. Addition and/or Improvements Combined with Interior Modifications . Additions and/or improvements to pre-FIRM (Flood Insurance Rate Maps) structures when the addition and/or improvements in combination with any interior modifications to the existing structure are:
1. No Substantial Improvement . The addition and/or improvements must be designed to minimize flood damages and must not be any more nonconforming than the existing structure.
2. Substantial Improvement . For the existing structure and the addition and/or modifications/rehabilitations/improvements must comply with the standards for new construction.
ii. Structures with No Modifications . Additions to pre-FIRM or post-FIRM (Flood Insurance Rate Maps) structures with no modifications/rehabilitations/improvements to the existing structure other than a standard door in the common wall shall require only the addition to comply with the standards for new construction.
iii. Structure Addition and/or Improvements combined with Interior Modifications . Additions and/or improvements to post-FIRM (Flood Insurance Rate Maps)
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