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 

Engineered Flood Vents

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ICC-ES Certified and Performance Tested Flood Vent

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Black Freedom Flood Vent Foundation Flood Vent

Winter Shield Included

Vent Size: 16" W x 8" H x 2 "D

Material - Polycarbonate

Certification - ICC-ES | ESR-4332

Also available in white


Vent Size - 16" W x 8" H x 3" D

Material - Marine Grade Stainless Steel

Certification - ICC-ES | ESR-2074

Multiple sizes & colors available


Vent Size -  16" W x 8" H x 3" D

Material - Marine Grade Stainless Steel

Certification - ICC-ES | ESR-2074

Multiple sizes & colors available


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.



FEMA Technical Bulletin 1

FEMA's Technical Bulletin 1 (TB-1) provides guidance on the NFIP regulations concerning requirements for openings in below BFE foundation walls, and walls of enclosures for buildings located in Flood Zones A, AE, A1-A30, AR, AO, and AH.

Do I Need Flood Vents?

Upload your Elevation Certificate for an evaluation by a Certified Floodplain Manager and receive a F.R.E. Flood Risk Report detailing your current situation and which mitigation solutions are best suited to reduce your flood insurance premium.