YOUR TECHNICAL RESOURCE
FOR FLOOD OPENINGS
Flood openings protect residential houses and commercial buildings in floodplains by preventing hydrostatic pressure buildup that can destroy walls and foundations.
This site serves as a technical resource for examining the purpose of flood openings, how they perform, and when they are required. Floodvent.com will also define the different types, what is compliant, their effectiveness in sustaining a structure, demonstrate how they work, and reveal their importance in securing a low flood insurance premium.
What is a Flood Vent?
Relieves (rather than resists) hydrostatic pressure on foundation walls during a flood event
Passively equalizes hydrostatic loads on enclosure walls below the BFE
A "wet floodproofing" technique, which allows for the automatic entry & exit of flood waters without human intervention
When Are Flood Vents Required?
The National Flood Insurance Program (NFIP) Regulations and Building Codes require:
Residential structures in Flood Zone A have their lowest finished floor above the Base Flood Elevation (BFE)
Any enclosure (i.e. crawlspace or garage) below the BFE to have flood vents to relieve hydrostatic pressure off the walls
Unlike residential buildings, commercial structures have the option to wet floodproof, dry floodproof, or a combination of both
Flood vents help guarantee the lowest proper flood insurance premium.