Dry Floodproofing is a method that completely seals a home or building to prevent floodwater from entering a structure. This method uses watertight shields for windows, watertight membranes and sealants to reduce water seepage into the structure. However, the Federal Emergency Management Agency (FEMA) does not allow dry floodproofing for new, substantially improved, or damaged homes in a Special Flood Hazard Area (SFHA).

Chapter 7 of FEMA's Selecting Appropriate Mitigation Measures for Floodprone Structures is a good resource for dry floodproofing methods.