Efficient and Effective Waterproofing: The Benefits of Using Tanking Slurry in Construction
Key Takeaways:
- Tanking slurry is an effective waterproofing material that forms insoluble crystals to fill cracks and prevent water leakage.
- It is recommended to use a bonding agent such as the SBR bonding agent for creating a strong adhesive bond and prevent re-emulsification.
- Tanking slurry should be applied to a clean, wet and saturated surface for best results, using a brush or roller for even application.
So, you're looking to waterproof your property, and you might be considering using a damp-proof membrane (DPM), but have you ever heard of tanking slurry? Tanking slurry is just as (if not more) effective than using a DPM and it’s even easier to use since it comes as a powder that only needs to be mixed with water and a bonding agent to create a paste. This paste is then simply brushed onto walls or surfaces to form a waterproof barrier.
It works by forming insoluble crystals that seep into and fill any cracks or fissures in walls, concrete, or bricks. Once applied, it creates a thick, watertight layer that fully prevents leakage or water ingress. Some common places where tanking slurry is used include basements, swimming pools, foundations, bathrooms, retaining walls, and exterior walls. One great thing about the KA Tanking Slurry is that it can be applied in one or two coats, with a coverage of 7-8m² per 25kg bucket. This makes it possible for even large projects to be completed quickly and efficiently by one person, reducing costs and speeding up your project timeline.
While tanking slurry can be applied directly to concrete, blockwork, masonry, or cement renders, the manufacturer recommends using a bonding agent like the SBR bonding agent. The bonding agent should be applied before the tanking slurry to ensure a durable adhesive bond that won’t re-emulsify. Although it’s technically possible to use the slurry without the bonding agent, we strongly advise against it as the manufacturer doesn’t guarantee the installation without it.
It should be applied to the desired surface using a brush or roller to ensure even coverage. This ensures a strong bond between the substrate and the slurry, preventing any moisture from seeping through. It’s also worth noting that the manufacturer does not recommend installing tanking slurry in temperatures below -5°C.
How to Use Tanking Slurry
First, you'll need a clean surface, so start by clearing the surface of debris. Make sure there’s no paint, oil, or any other chemicals present. The tanking slurry must be applied to a porous, wet substrate that’s clean. Any contaminants will hinder the adhesion of the slurry.
Next, saturate the surface that the tanking slurry is to be applied to with water. This allows the crystalline chemicals to penetrate deep into any cracks or crevices.
Then mix the tanking slurry powder into a bucket of water at a ratio of 2.5:3 parts KA Tanking Slurry – for example, 5 liters of water requires 12.5kg – 15kg of tanking slurry powder. Mix thoroughly into a paste. It’s important not to mix more of the slurry than can be applied within 30 minutes at 20°C.
There are slight differences when used on walls versus floors, so we’ve written two separate guides below:
Using Tanking Slurry on Walls
As mentioned earlier, we recommend using a bonding agent before applying the tanking slurry, such as the KA Bond SBR. This helps the slurry bond to the wall, creating an adhesive bond that doesn’t re-emulsify – meaning the tanking slurry adheres properly to the wall. If the emulsion breaks down, the tanking slurry will lose its waterproofing properties and become ineffective.
So, before applying the tanking slurry to the wall, dilute the KA Bond SBR in a 1:1 ratio with water. Be sure not to let the SBR dry completely; it should remain tacky before applying the tanking slurry.
Mechanically mix the tanking slurry and add 1 liter of KA Bond SBR for every 25kg bucket. For example, use 1 liter of KA Bond SBR with 5 liters of water.
After around 4-6 hours, it should become touch dry, and you can then add the final second coat. The tanking slurry should be brushed, troweled, or sprayed onto the walls with an ideal thickness of 3-5mm. One coat should be applied horizontally and the other vertically.
Using Tanking Slurry on Floors
When applying the slurry to a floor, make a saw cut along the edge of the floor approximately 15mm deep at a 45° angle. This allows the mixture to enter the corners, ensuring they are sufficiently tanked.
First, dilute KA Bond SBR in a 1:1 ratio with water and apply it to the floor area. Let it sit for approximately 10 – 15 minutes for it to "tack over," making sure it doesn't dry completely.
Next, mechanically mix your tanking slurry with KA Bond SBR and pour one coat onto the floor area. A guide is to add 1 liter of KA Bond into every 25kg bucket. Pour or trowel it onto the floor to a thickness of 3-5mm.
For repairing large cracks, use a 3:1 ratio of Sand:Cement mortar gauged with SBR bonding agent. This will effectively plug the cracks. This must be left for at least 24 hours to cure before applying a coat of tanking slurry. For larger areas of new brickwork, poured concrete, or cement renders, you should leave it for 3 days before applying the tanking slurry.
In summary, KA Tanking slurry along with the SBR bonding agent is the perfect solution for preventing leakage into concrete and brick structures. It’s easy to apply and provides a strong, permanent watertight layer.
Whether you’re working on a large commercial project or a smaller residential building or renovation, old or new, KA tanking slurry is an excellent choice to keep your structure dry and protected even in heavy rain.
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