KÖSTER 2K Flex | Flexible Cement-Based Waterproofing Mortar
Product Description
KÖSTER 2K Flex is a professional two-component, cement-based waterproofing mortar with high elasticity. Thanks to its flexible structure, it adapts to movements in structural elements, reduces the risk of cracking, and provides long-lasting waterproofing performance.
Resistant to positive water pressure, KÖSTER 2K Flex offers a reliable waterproofing solution with its high adhesion strength, flexible structure, and easy application properties. It is suitable for both new construction projects and renovation applications.
It provides effective protection against water leakage in wet areas such as bathrooms, balconies, and terraces, as well as in foundation walls and retaining walls.
Technical Specifications
Composition: Two-component system (cement-based powder component + polymer liquid component)
Flexibility: High elasticity and crack-bridging capability
Waterproofing Performance: Resistant to positive water pressure
Application Method: Applied by brush, trowel, or suitable spraying equipment
Coating Thickness: Approximately 3 mm total thickness with two-layer application
Adhesion Strength: Provides strong adhesion to concrete, plaster, and screed surfaces
Advantages
High Elasticity: Adapts to structural movements and surface deformations, helping reduce the risk of cracking.
Crack-Bridging Capability: Helps prevent small surface cracks from causing water permeability problems.
Easy Application: Can be applied quickly and practically using a brush, trowel, or spraying method.
Complete Waterproofing: Forms an elastic waterproof layer that prevents water penetration through the surface.
Resistance Against Harsh Conditions: Provides durability against freezing conditions and UV exposure.
Wide Application Range: Suitable for both new construction projects and renovation works.
Solvent-Free: Provides a safer application environment for users and the environment.
Application Areas
KÖSTER 2K Flex is widely used in the following areas:
Bathrooms, showers, and wet areas
Balcony and terrace surfaces
Foundation retaining walls
Basement interior and exterior walls
Pedestrian traffic areas
Horizontal and vertical surfaces with crack formation risks
Application Instructions
The application surface must be clean, sound, and free from dust, dirt, oil, and loose particles.
The two components should be mixed according to the manufacturer’s technical instructions using a low-speed mixer until a homogeneous consistency is achieved.
The prepared mixture is applied as the first coat. After the first coat has dried sufficiently, the second coat is applied in a cross direction to ensure a continuous waterproofing layer.
After application, the surface should be protected from direct sunlight, extreme temperature changes, and adverse weather conditions during the curing period.
Frequently Asked Questions (FAQ)
Where is KÖSTER 2K Flex used?
It can be used in bathrooms, balconies, terraces, foundation walls, and many interior and exterior surfaces exposed to water.
Is KÖSTER 2K Flex a flexible product?
Yes. Its elastic structure allows it to adapt to structural movements and provides crack-bridging capability.
Is it resistant to negative water pressure?
No. KÖSTER 2K Flex is designed to provide waterproofing against positive water pressure.
Does the application require special equipment?
No. The product can be applied using brushes, trowels, or suitable spraying equipment.
How many coats should be applied?
Generally, two coats are recommended. The required number of coats and application thickness may vary depending on surface conditions.
KÖSTER 2K Flex is an effective cement-based waterproofing solution that provides long-lasting protection for structures with its flexible structure, high adhesion strength, and easy application properties. It delivers reliable performance, especially on surfaces where crack formation may occur.