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Sikalastic®-1K is a fibre-reinforced, one-component waterproofing mortar engineered for structural protection and liquid-applied membrane applications in high-pressure environments. Formulated with alkali-resistant polymers, it delivers Class A3 crack-bridging performance and withstands negative water pressure up to 2.5 bar, making it a critical choice for remedial basement tanking and underground vaults.
This versatile coating is certified to AS/NZS 4020 for potable water contact and meets EN 1504-2 standards for concrete protection against carbonation and freeze-thaw cycles.
Frequently Asked Questions About Sikalastic®-1K
Q: What is Sikalastic®-1K used for?
A: Sikalastic®-1K is used for flexible waterproofing and protection of concrete structures, including tanks, basins, pipes, bathrooms, showers, terraces, balconies, swimming pools, external wall surfaces, and for the flexible protection coating of reinforced concrete.
Q: How do you apply Sikalastic®-1K?
A: Sikalastic®-1K can be applied by brush, spray, or trowel. For optimal waterproofing performance, apply by trowel in at least 2 layers to a total thickness of at least 3 mm. When applying by brush, apply in a minimum of 2-3 layers, with each layer being a maximum of 1 mm thick.
Q: Is Sikalastic®-1K suitable for use in contact with drinking water?
A: Yes, Sikalastic®-1K is certified according to AS/NZS 4020: 2005 for use in contact with drinking water. However, ensure it is completely hardened and wash carefully before contact, following local regulations.
Q: What surface preparation is required before applying Sikalastic®-1K?
A: Substrates must be structurally sound, clean, dry, and free of contaminants. Clean surfaces by blast cleaning, high-pressure water-jetting, wire-brushing, grinding, etc. Repair concrete substrates as necessary.
Q: What are the storage requirements for Sikalastic®-1K?
A: Sikalastic®-1K should be stored properly in the original packaging, in cool and dry conditions. Protect it from water. The shelf life is 6 months from the date of production.
Use Sikalastic®-1K for:
- Flexible waterproofing and protection of concrete structures.
- Waterproofing of bathrooms, showers, terraces, balconies, swimming pools.
- Waterproofing of external wall surfaces to be backfilled in ground.
- Inside waterproofing of negative water pressure of walls and floors in basements.
- Flexible protection coating for reinforced concrete structures.
Why Use Sikalastic®-1K:
- One-component product, only water needs to be added.
- Adjustable consistency, easy to apply by brush or trowel.
- Good sag resistance and easy to apply, even on vertical surfaces.
- Good crack-bridging ability.
- Very good adhesion on many substrates.
How to apply Sikalastic®-1K:
- Prepare the substrate to be structurally sound, clean, dry, and free of contaminants.
- Mix Sikalastic®-1K with water according to the application method (brush or trowel).
- Apply Sikalastic®-1K by brush, trowel, or spray, ensuring uniform coverage.
- Apply in at least 2 layers for standard applications, or 3-4 mm DFT for negative pressure/immersed applications.
- Wait until the first layer is dry before applying subsequent layers.
Sikalastic®-1K limitations:
- Sikalastic®-1K shall not be smoothed using a float or trowel.
- Protect from rain for at least 24–48 h after application.
- Avoid direct contact with chlorinated water i.e. in swimming pools, by using suitable protection.
- Avoid application in direct sun light, when rain is imminent or in strong winds.
Safety precautions when using Sikalastic®-1K:
- For information and advice on the safe handling, storage and disposal of chemical products, users shall refer to the most recent Safety Data Sheet (SDS) containing physical, ecological, toxicological and other safety-related data.
Sikalastic®-1K can be used on the following substrates:
- Concrete: Provides waterproofing and protection for concrete structures.
- Cement Mortars: Bonds effectively for reliable waterproofing.
- Stone: Suitable for waterproofing stone surfaces.
- Masonry: Protects masonry from water and environmental damage.
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