What is it?

Structural - In a building or structure that is dry floodproofed, the exterior envelope of the building or structure acts as the flood barrier. Dry floodproofing is practical when minimal structural design changes are needed to floodproof the building or structure. Dry floodproofing is best suited for buildings and structures that will experience short-term, minor flooding (< 5-feet) on a regular basis (at least once every 5 to 10 years).

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Architectural - ​​​​​​​Using dry floodproofing means making the building, and all its utility systems, completely watertight and impermeable to the passage of water below the base flood elevation.25 Using dry flood-proofing will require a certification called the Floodproofing Certificate for Non-Residential Structures (FEMA Form 81-65).

Examples of dry floodproofing features include:

• Sealants, coatings and membranes to reduce leakage of floodwater through walls and wall penetrations

• Installation of watertight closures for doors and windows

• Installation of flood barriers or shields around the structure

• Reinforcement of walls to withstand floodwater and floating debris

• Anchoring of the building to resist flotation, collapse and lateral movement

• Installation of pumps to control interior water levels

• Installation of check valves to prevent the entrance of floodwater or sewage flows through utilities

• Location of electrical, mechanical, utility and other valuable damageable equipment and contents above the expected flood level