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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. 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

Food Vent Options

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.

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