Quick answer: For a doorway that takes on water in heavy rain, the Quick Dam Flood Gate seals the opening up to 26 inches high with no tools [5]. For a garage door or basement stairwell that gets shallow runoff, the water-filled Log Dam is reusable and, unlike Quick Dam’s water-activated products, works in salt water [8]. None of these replace flood insurance or leaving when you’re told to evacuate [1][2].
At a glance
- Ida flood insurance claims, N.J.
- 6,158 paid, totaling $314.7 million [1]
- Ida disaster aid, N.J.
- 44,993 households approved, $253 million [1]
- Counties designated for individual aid
- 12, from Bergen to Gloucester [1]
- Flood insurance waiting period
- Normally 30 days after purchase [1][2]
- Moving water
- 6 inches can knock an adult over [3]
Why New Jersey homes flood
Hurricane Ida’s remnants brought torrential rain to New Jersey in September 2021. FEMA approved disaster assistance for 44,993 households, totaling $253 million, across 12 counties: Bergen, Essex, Gloucester, Hudson, Hunterdon, Mercer, Middlesex, Morris, Passaic, Somerset, Union and Warren [1]. The National Flood Insurance Program paid 6,158 policyholder claims in the state, totaling $314.7 million [1].
Most of those counties are inland, and FEMA describes the damage as severe flooding from torrential rain [1], so a home doesn’t need to be near the ocean to take on water. Door barriers are a low-cost way to keep shallow water out of a doorway, garage or basement entry. FEMA lists dry floodproofing, sealing a home’s exterior against floodwater, as one of six ways to retrofit a home, and says to check with your local floodplain administrator or building official before you retrofit [4].
How we chose
- Height rating from the maker. We list how high each product holds water, because that decides what it’s good for.
- Fresh vs. salt water. Shore and tidal-river homes can see salty floodwater. We note which products the maker says fail in salt water.
- No permanent install. Every pick is set out before a storm and stored after, which suits renters and owners alike.
- Recall check. We searched the CPSC recall database for Quick Dam and flood barrier products on November 2, 2026. None turned up.
We found complete, published specs only from Quick Dam, so all four picks are theirs; each does a different job.
Our picks
Best for: Front, back and patio doors
Quick Dam Flood Gate Doorway Flood Barrier (QDFG35, 35 to 40 in.)
The only pick that protects against more than a few inches of water. Quick Dam says you position and deploy it in minutes, with no tools, sandbags or labor [5].
- Blocks doorways up to 26 in. high [5]
- Sizes from 25 to 60 in. wide in 5 in. ranges; panels combine for wider openings [5]
- Reusable; Quick Dam says it is Kitemark certified [5]
Safety check: Quick Dam says the Flood Gate is Kitemark certified [5]. No CPSC recall found (checked 2026-11-02).
Watch out: Measure the opening first and buy the size range that fits; a 35 to 40 in. gate won't seal a 42 in. door. It protects only the door opening, not other ways water can get in.
See it on Amazon → We chose it from specs and safety records; we haven't tested it ourselves.
Best for: Garage doors and long thresholds
Quick Dam Water-Activated Flood Barrier, 10 ft. (QD610-1)
It's a flat tube you lay across the opening. When water reaches it, it swells into a barrier, and you can leave it in place through storm season.
- Swells to about 3.5 in. high within 10 minutes of getting wet [6]
- Available in 5, 10 and 17 ft lengths; absorbs 4 to 13.5 gallons depending on length [6]
- Stack in a pyramid for more height [6]
Safety check: No safety certification applies. No CPSC recall found (checked 2026-11-02).
Watch out: Quick Dam says it is not for use with salt water, because a chemical reaction makes it deflate [6]. Quick Dam says the material decomposes over time. Each layer is only 3.5 in. high.
See it on Amazon → We chose it from specs and safety records; we haven't tested it ourselves.
Best for: Building a short wall without sand
Quick Dam Water-Activated Flood Bags, 1 x 2 ft., 20-Pack (QD1224-20)
Sandless sandbags. They store flat, then swell when wet, and you stack them like bricks to plug gaps a single barrier can't cover.
- Each bag grows to 12 x 24 x 3.5 in. and absorbs 4 gallons [7]
- Reaches full size in 10 minutes; stack in a brick pattern for height [7]
- Also sold in 2, 6 and 10 packs [7]
Safety check: No safety certification applies. No CPSC recall found (checked 2026-11-02).
Watch out: Not for salt water, according to Quick Dam [7]. Each swollen bag holds about 4 gallons of water, so they're heavy, and a short stack holds back far less than a sealed door panel.
See it on Amazon → We chose it from specs and safety records; we haven't tested it ourselves.
Best for: Shore homes and repeated use
Quick Dam Log Dam Water-Filled Barrier, 6 in. x 10 ft. (QDLD610)
You fill it with a garden hose and drain it afterward, so it's reusable year after year, and Quick Dam says it handles salt water.
- Holds back about 6 in. of water (a 3 in. size is also sold) [8]
- Industrial-strength 18 oz reinforced PVC with RF-welded seams [8]
- Rated for fresh water, salt water and many chemicals; hose adapter included [8]
Safety check: No safety certification applies. No CPSC recall found (checked 2026-11-02).
Watch out: It needs a working hose and time to fill before the water arrives, and it must sit flat on the surface to seal [8]. Six inches is the limit.
See it on Amazon → We chose it from specs and safety records; we haven't tested it ourselves.
Buying guide
- Know your water. These products are rated for a few inches of water, or 26 inches for the Flood Gate. Rising river or tidal water can go higher than that, and for permanent protection FEMA says to talk with your local floodplain administrator or building official before retrofitting [4].
- Measure every opening. Doors, garage doors and basement stairwells all need their own solution.
- Set barriers early. Quick Dam’s water-activated products need about 10 minutes to swell, and the Log Dam has to be filled [6][8].
- Buy flood insurance well ahead. Ready.gov says a policy typically takes up to 30 days to go into effect [2].
Sources
Common questions
How high can a door flood barrier hold back water?
It depends on the product. Quick Dam rates its Flood Gate for doorways up to 26 inches high, while its water-activated barriers and bags rise to about 3.5 inches and its Log Dam to about 3 or 6 inches. Low barriers are for runoff and shallow street flooding, not storm surge.
Do flood barriers work in salt water?
Quick Dam says its water-activated Flood Barriers and Flood Bags are not for use with salt water, because a chemical reaction makes them deflate. Its water-filled Log Dam is rated for fresh water, salt water and many chemicals.
Does homeowners insurance cover flood damage?
Usually not. FEMA says most renters, homeowners and auto policies don't cover flood damage, and a flood insurance policy normally takes effect 30 days after you buy it.