How to Stop Draughts Around a Dishwasher or Sink
The dishwasher is probably innocent.
The recess it sits in is usually the real problem.
If you can feel cold air coming from around your dishwasher, it is easy to blame the appliance. Fair enough. It is sitting right there in the breeze way.
But the draught is usually not coming through the dishwasher itself. It is coming from the space around it, behind it, under the cupboards, through gaps in the wall, or up from the floor.
A dishwasher recess can become a surprisingly effective draught delivery system. Very handy if you are trying to cool your ankles but less handy if you are trying to keep your kitchen comfortable.
Why dishwasher draughts happen
To understand the draught, you need to understand how kitchens are built. Most kitchen cupboards are not sealed airtight to the floor, walls or benchtop. They are installed to look straight and level, even when the floor and walls are not. That means there can be hidden gaps behind and under the cabinets.
Air can travel through those gaps, then pop out (along with several rodents) around the dishwasher because the dishwasher space is usually the easiest path. Your dishwasher recess is basically saying, “This way, everyone.”
Two common kitchen types
1. Kitchens on framed kickers
Many kitchens are built on hard framed kickers. The cupboards sit on top of the kicker structure, and the kickboards are fixed around the base.
This can still leave plenty of draught paths, including:
- gaps behind the kickers
- gaps between the floor and wall
- missing skirting behind the cupboards
- holes through the floor
- holes through the wall
- gaps where services come through
- shims used to level the kicker
- gaps behind cupboards where walls are not straight
Even if the kitchen looks neat from the front, air may still be moving underneath and behind it. Old houses do not waste an opportunity.
2. European-style kitchens on adjustable legs
European-style kitchens are becoming more common. Instead of sitting on framed kickers, the cabinets sit on adjustable legs. The kickboards then clip onto the legs. Lovely for installation but a lot less lovely for draught proofing.
This setup can allow air to move freely under the cupboards. And because the dishwasher recess usually has no kicker across the front, any air moving under the kitchen can come straight up around the dishwasher. This is convenient - for the draught. 😥
Safety first
Before pulling a dishwasher out, check how it is connected. Dishwashers may be connected to water, drainage and power. Some are plugged into a power point. Some may be hardwired. Some have very little slack in the hoses. If you are not confident, do not yank it out and hope.
Turn off power where appropriate, avoid damaging hoses, and get a qualified person involved if the dishwasher is hardwired or difficult to move safely. Also check the dishwasher manual - do not block clearances or ventilation required by the manufacturer. We are draught proofing the recess, not suffocating the dishwasher.
What you will need
Depending on what you find, you may need:
- torch
- vacuum
- cleaning cloth
- mild cleaner
- UltraClear or suitable flexible sealant
- filler rod for larger gaps
- scraper or tool for cleaning old residue
- foam infill for larger under-cupboard voids
- patience, because dishwasher recesses are not glamorous
Optional:
- gloves
- knee pads
- a second person to help move the dishwasher safely
The DIY process
If you are a Watcher, watch the video first.
If you are a Reader, here are the steps.
Best result? Do both. Dishwasher recesses are full of surprises.
1. Confirm the draught is coming from the dishwasher area
Check around the dishwasher opening.
- along the floor
- both sides of the dishwasher
- behind the kickboards
- near the benchtop
- around the wall behind the dishwasher
- around service penetrations
Use the back of your hand to feel for air movement. Do this on a cold or windy day if you can. Draughts are much easier to catch when the weather is helping you dob them in.
2. Work out what kind of kitchen you have
Look at the kickboards below the cabinets. If the cabinets sit on a solid framed base, you probably have a framed kicker kitchen.
If the kickboards clip on and the cabinets are sitting on adjustable legs, you probably have a European-style kitchen.
This matters because the draught path is different.
- A framed kicker kitchen may have gaps around the kicker, wall and floor.
- A European-style kitchen may have open air movement under the whole run of cupboards.
3. Carefully remove the dishwasher
Pull the dishwasher out only if it is safe to do so. Do not force it. You may be able to slide it onto a carpet square, or mat to make it easier to move. Check the power, water inlet and drain hose. Once the dishwasher is out, you can inspect the recess properly.
This is where the truth usually reveals itself along with dust bunnies with a long family history and the lost ‘thing’ that you have been looking for.
4. Check the floor-to-wall gap
Look along the back of the dishwasher recess where the floor meets the wall. In many kitchens, there is no skirting behind the cabinets. If the home has timber floors, there may be a gap between the floorboards and the wall. That gap can allow air to come in from the wall cavity, subfloor or surrounding building gaps. If the gap is small, clean it and seal it with a suitable flexible sealant. For larger gaps, use filler rod first, then seal over it. Do not just blob sealant into a canyon sized hole and hope that does the trick.
5. Check the sides of the cupboards
Look at both sides of the dishwasher recess. You are checking whether the cupboards are hard up against the wall and floor, or whether there are gaps behind them. Cupboards are often shimmed so they sit straight, especially when walls are not perfectly flat. That can leave a vertical draught path behind the cabinets. If there are accessible gaps around the sides of the recess, clean them and seal them. The aim is to stop air moving from behind the cupboards into the dishwasher opening.
6. Check the kickers
If your kitchen sits on framed kickers, inspect the kicker edges near the dishwasher.
Look for:
- gaps beside the kicker
- gaps under the kicker
- gaps between the kicker and cupboard
- holes where services pass through
- loose or poorly sealed sections
Seal accessible gaps carefully. If air can move under the cabinetry, the dishwasher recess is often where it escapes.
7. Check service holes in the wall or floor
Dishwasher recesses often contain plumbing, electrical or drainage penetrations. These holes can be much larger than they need to be.
Look for gaps around:
- water pipes
- drain hoses
- electrical cables
- old unused holes
- wall penetrations
- floor penetrations
Seal around service penetrations carefully without damaging pipes, cables or hoses.
Do not seal anything in a way that makes future servicing impossible. A draught-free kitchen is good but a trapped dishwasher hose is absolutely not. Use steel wool around a large hole that still needs to be accessible.
8. Check the gap between the benchtop and wall
This is a big one. Even if the dishwasher sits on a concrete slab, you can still get a draught around the recess if there is a large gap between the benchtop and the wall. That gap can open into the wall cavity, which is often a highly ventilated space. In the video, this was the main culprit (you did watch the video, didn’t you!!!??)
A big gap behind the bench can allow air to move down behind the cabinets and come out around the dishwasher. If you find a gap between the benchtop and wall, clean it and seal it properly.
9. European-style kitchens: deal with the open under-cupboard space
If your kitchen is built on adjustable legs with clip-on kickboards, there may be free air movement under the entire cabinet run. That air can come straight up at the dishwasher recess because there is no kickboard across the front of the dishwasher space. In this situation, you may need to infill or block the air path under the cabinets near the dishwasher recess. A foam infill can be useful here, including cut sections of Chimney Draught Stopper foam where suitable. The goal is to stop air travelling freely under the cabinets and escaping around the dishwasher. Keep it neat and removable if access may be needed. Do not interfere with the dishwasher installation, hoses, power or required clearances.
10. Reinstall the dishwasher and test again
Once the gaps are sealed, carefully slide the dishwasher back into place.
Check that:
- hoses are not kinked
- power and water connections are safe
- the dishwasher sits correctly
- the door opens and closes properly
- the appliance still has required clearances
- the draught has reduced
Then test the area again with the back of your hand. If the air movement has gone, excellent. If it has improved but not disappeared, keep looking. There may be another gap behind the cabinetry or along the floor line. Draughts are sneaky little blighters and they rarely travel alone.
Ready to Block That Dishwasher Draught?
UltraClear
Use UltraClear for small gaps around walls, floors, trims, service penetrations and cupboard edges. It applies white so you can see what you are doing, then dries clear.
Filler rod in our Gap Filler Kit
Use filler rod behind sealant for larger gaps. This helps avoid wasting a whole tube of sealant trying to fill a gap that really needs backing first.
Chimney Draught Stopper
For some European-style kitchens with open air movement under the cupboards, sections of foam can be used as an infill to help block the under-cupboard draught path near the dishwasher recess. Use carefully and keep appliance access in mind.
Bonus Tip: Pair this project with Find and Fix My Draughts to uncover every sneaky leak in your home.
Common questions
Is the draught coming through the dishwasher?
No. The draught is usually coming from the recess around the dishwasher, the wall behind it, the floor gap, the cupboard gaps or the space under the kitchen cabinets. The dishwasher is just where you notice it.
Can a dishwasher draught happen on a concrete slab?
Yes. A concrete slab reduces some draught paths from below, but it does not stop air moving through wall cavities, gaps behind cabinets, or gaps between the benchtop and wall.
Do I need to remove the dishwasher?
Usually, yes, if you want to inspect the recess properly. But only do this if it is safe. Dishwashers can be connected to water, drainage and power. If unsure, get help.
Can I just seal around the front of the dishwasher?
Not usually. Sealing around the visible front edge may hide the problem without fixing the draught path. Find where the air is coming from and seal that.
Should I use expanding foam?
Be careful. Expanding foam can over-expand, make a mess, block access, and create problems around appliances, pipes and cabinetry. For small gaps, use a flexible sealant. For larger gaps, use filler rodm steel wool (rodents don’t like it) or a suitable removable infill.
What if I cannot access the gap?
If you cannot access the source of the draught, you may need to remove kickboards, move the dishwasher, or get help from someone who can inspect the cabinetry safely.
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