Flood Air Brick Covers (pack) review
By Tom Calder
A cheap, sensible layer of defence if your air bricks sit low enough to let floodwater in, and FloodKit says its patches passed the BSI's PAS 1188-1:2014 test to keep out water up to 840mm high. They only close off one route in, though, so treat them as one part of a wider flood plan rather than the whole answer.
- Best for
- Homes in flood-risk areas with air bricks sitting below likely flood level.
- Skip it if
- Your likely flood route is through doorways or rising groundwater rather than the air bricks, or…
as of 2 Nov 2026, 16:07 GMT · Details
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Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- Inexpensive and quick to deploy when a flood warning comes in
- Reusable year after year, and clip-on types need no drilling
- FloodKit says the patches passed PAS 1188-1:2014 for flood water up to 840mm
Worth knowing
- Only protect the air bricks, not doors, walls or drains, so water can still enter elsewhere
- Must be fitted correctly with a ~20mm seal margin around each brick, and you need one per air brick
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Our review
FloodKit's Airbrick Patch is a pack of two preformed strips of adhesive mastic, each 300 by 145mm, that you press over an air brick when a flood warning comes in. FloodKit's claim is that the patches passed the PAS 1188-1:2014 test for floodwater up to 840mm. They close one route into the house, cheaply and without tools. They are a part of a flood plan, not the plan.
What it is and how it fits
Each pack holds two patches of UK-made adhesive mastic tape on a film backing, sized to cover a standard air brick with a margin. FloodKit says they can be layered to cover a double air brick, a tumble-dryer vent, a low-level letterbox or a cat flap. Peel the backing, press the patch over the brick and around its edge, and smooth it down. The maker links a fitting video rather than written steps, so watch it before the night you need it, and count your air bricks: one patch each.
FloodKit states that its patches passed PAS 1188-1:2014 testing for floodwater up to 840mm. That is the maker's claim and it publishes no test report or Kitemark number alongside it. PAS 1188 has since been replaced by BS 851188, whose Part 1 covers building products such as these; whether the patches have been tested to the newer standard is not stated.
Why air bricks matter
Air bricks sit at or below floor level and ventilate the space under a suspended timber floor. In a flood they are often the first way in, because water reaches them before it reaches the door threshold. Covering them is one of the quick measures GOV.UK's prepare for a flood guidance expects households to have ready, with sandbags or barriers for doors and a plan to move things upstairs. Our flood preparation checklist sets the order, and flood warnings explained says what each Environment Agency warning level means for when to act.
The limits
FloodKit says to remove the patches once the flood has passed, so the underfloor can breathe again. Leave them on and the ventilation that stops damp and rot under the floor is blocked. They do nothing for doors, walls, drains backing up or water rising through the floor, so a house with its threshold at risk still needs a door barrier. The adhesive wants a clean, dry brick face; on a wet winter night with the water already lapping, it will be harder. Whether a patch can be peeled off and re-used is not stated by the maker.
How it compares
On the flood protection page, the Floodgate door barrier protects an inward-opening door to 600mm and is reusable; FloodSax and hessian sandbags slow water at thresholds for a single event. The air brick patch is the only item on the page for the bricks themselves. The alternative is a self-closing air brick fitted permanently, which costs more and needs a builder, but needs nobody at home when the water rises. For a rented house or a tight budget, the patch is the sensible first buy.
Our verdict
Buy a pack per pair of air bricks if your home is in a flood warning area and the bricks sit below likely water level, and keep them with your door barrier and torch. Skip it if your flood risk is groundwater through the floor or water at the door rather than the bricks, or if you would be tempted to leave the patches on all year; a self-closing air brick suits that household better.
A researched review, built from the maker's specs, manual and UK listings; facts checked 2 Nov 2026. Sources: FloodKit: Airbrick Patch, product page (read 2 November 2026); GOV.UK: Prepare for flooding; BSI: Introducing BS 851188, the standard that replaces PAS 1188; CIRIA C790: Code of practice for property flood resilience.
Who shouldn't buy this
Your likely flood route is through doorways or rising groundwater rather than the air bricks, or you'd be tempted to leave permanent covers on all year, which blocks underfloor ventilation and invites damp. In those cases a proper door barrier or an automatic self-closing air brick is the better spend.
Key specs
| Type | Adhesive mastic patch, cut or layered to fit (pack of 2) |
| Protects up to | 84 cm |
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the UK price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for Homeowners in a known flood-risk area with an inward-opening door who want a reusable barrier rather than sandbags.
as of 2 Nov 2026, 16:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Best for Renters, flats and anyone without space to store sand, for shallow doorway flooding and indoor leaks.
as of 2 Nov 2026, 16:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Best for Households facing shallow, slow-rising flooding who want a compact, sand-free defence they can store flat by the door.
as of 2 Nov 2026, 16:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Questions
How high a flood does the FloodKit Airbrick Patch protect against?
FloodKit states that its patches passed PAS 1188-1:2014 testing for floodwater up to 840mm. The maker publishes the claim without a test report, and the standard has since been replaced by BS 851188.
How many air brick patches are in a pack?
Two, each 300 by 145mm. FloodKit says they can be layered over a double air brick, a dryer vent, a low letterbox or a cat flap, so count what you need to cover.
Can I leave air brick covers on all year?
No. FloodKit says to take them off after the flood so the underfloor space ventilates. Blocked air bricks lead to damp and rot under a timber floor.
Do air brick patches stop a flood on their own?
No. They close one route in. Doors need a barrier or sandbags, and nothing stops water rising through the floor. GOV.UK's prepare for a flood guidance covers the rest of the plan.
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