What Is Tanking Slurry and When Should You Use It for Waterproofing?
If you’re a homeowner looking to stop damp creeping into your basement, or a DIY enthusiast wanting to keep your walls dry, tanking slurry is the stuff you need to know about. A good tanking job saves a lot of headaches (and a fair bit of money) down the line.
So, What is Tanking Slurry?
Think of tanking slurry as a waterproofing paste. You mix it up (usually with water), slap it onto your walls or floors, and it forms a protective, impermeable barrier. It sticks like glue, so water can’t get through. Job done.
In the UK, we use it a lot in basements, cellars, and any below-ground concrete structures. It’s different from your regular paint or damp-proof coating because it’s thicker, cement-based, and it actually bonds with the masonry or concrete.
You might also see products called ka tanking slurry - it’s just one brand of the stuff, but it works on the same principle. And then there’s tanking paint, which is similar but usually applied thinner or for walls above ground. Both do the same job: keeping the damp out.
When Should You Use Tanking Slurry?
The short answer? Anywhere water is likely to be a problem. Here are the main scenarios:
Basements and Cellars - if your house sits on clay or a high water table, tanking slurry is a lifesaver. It prevents water seeping through concrete or blockwork.
Concrete Floors and Walls - new builds or refurbishments often need a layer of protection before you finish with plaster, tiles, or flooring.
Below-Ground Walls - garages, retaining walls, or extensions that sit partially underground benefit massively from a tanked layer.
Basically, if water might be getting through, tank it!
How to Apply Tanking Slurry
Applying tanking slurry isn’t rocket science, but you need a steady hand. Here’s the process most pros follow:
Prep the Surface - clean the wall, remove loose bits, and make sure it’s damp but not soaking.
Mix the Slurry - follow the instructions. Usually, it’s a mix of powder and water to a creamy consistency.
Apply in Layers - using a brush or trowel, coat the wall in 2-3 layers. Don’t try to be clever and do it all at once.
Curing Time - give it time to set. Most tanking solutions need 24-48 hours between coats.
Once dry, the wall is basically waterproof. You can even add tanking solution for extra protection in tricky spots.
Why It’s Worth Doing Properly
A dodgy tanking job leads to damp, mould, and potentially structural damage. Get the tanking slurry right the first time, and your basement stays dry for years. Nothing beats walking into a dry, cosy cellar in a rainy British winter and knowing your tools, wine, or boiler aren’t going to get ruined by moisture.
Tanking Slurry: Your First Line of Defence
Whether you’re a DIYer or just supervising the lads on site, tanking slurry, ka tanking slurry, or tanking paint is your first line of defence against damp. Take your time, prep properly, follow the instructions, and your walls will thank you - literally staying dry when the rain pounds down outside.
