What Is It?

Cost: $180-250 per ft (by width). Price increases for taller shields.
Applications: Designed to be easily added onto any existing building.
Service Life: Indefinite, with regular inspection/ replacement of seals.

Dry floodproofing techniques can be used to make a structure watertight below flood elevation. Flood shields are temporary, watertight barriers erected in front of building openings (e.g. doors, windows, garages) prior to flood events, constructed of aluminum, stainless steel, or plastic and use neoprene rubber or similar materials to seal the barrier. Flood shield mounts are typically installed around all building openings externally, though inside mounts are possible. The shields are then put in place in preparation for potential flooding or after flood warnings are issued. Installation time varies between models. Most flood shields are able to effectively protect buildings from floods of 1-2 feet.


  • Cheaper than passive flood barriers and easily installed on existing buildings.
  • Applied to the building itself and does not require additional land (for floodwalls or levees).
  • Easily combined with other dry floodproofing measures for maximum protection.


  • Deployment of flood shields requires human intervention and sufficient installation time for larger buildings. Without adequate warning, flooding can occur before shields can be put in place.
  • Flood shields do not protect structures from high-velocity flood flows and wave action. Most models do not provide protection for floods deeper than 2 feet.
  • Dry floodproofing measures cannot alone be used to bring substantially damaged or substantially improved residential structures into compliance with floodplain management ordinances and laws.

Regulatory Impacts and Requirements

A summary of potential regulatory touchpoints follows below:

  • Flood shields installed over all entrances and exits to a building may cause concern over building egress from the fire or inspectional services departments.

Financing Options, Incentives, And Rebates

Additional Resources

Project Examples



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