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    Waterproofing

    Hydrocem 1K Flex single component flexible cementitious waterproofing slurry by MATEX, 20 kg bag

    Hydrocem 1k Flex

    Single Component Flexible Cementitious Waterproofing Slurry

    HYDROCEM 1K FLEX is a highly flexible, single-component, sulphate-resistant waterproofing slurry designed to form a crack-bridging protective layer on concrete structures exposed to movement. It is ideal for a wide range of applications, including water reservoirs, wet areas, swimming pools, and both interior and exterior surfaces. HYDROCEM 1K FLEX offers excellent adhesion to substrates, superior mechanical strength, and outstanding abrasion resistance. It performs under both positive and negative water pressure, remains breathable, and can be applied over damp surfaces. Safe for contact with potable water, it is also compatible with tile adhesives, coatings, and toppings, ensuring a versatile and durable waterproofing solution.

    Technical data:
    • Color/Appearance : cement grey or white powder
    • Workable time : 40 minutes @ 25°C
    • Application Temperature : 5°C to 35°C
    • Recoating interval : 4-8 hours
    • Coverage : 5-6 m² per bag @ 2mm thickness
    • Packaging : 20 kg bag
    Related Documents:

    How to Apply Hydrocem 1k Flex

    Hydrocem 1K Flex is mixed with water on site and applied in two coats, green on green, by trowel, brush or spraying machine.

    1. Prepare the substrate. Surfaces must be sound, clean and free from loose material, efflorescence, laitance, curing compounds, dirt, oil and grease, and concrete must be cured for at least 14 days. Remove hard laitance by captive blasting or sand blasting, or with hand mechanical tools and wire brush discs where access is restricted.
    2. Form fillets and treat cracks. Create a 45° fillet at wall-floor junctions with Lavarep F40 or Lavarep F60. Fill superficial cracks with a cementitious repair mortar, or a paste of Hydrocem 1K Flex for dynamic superficial cracks; fill dynamic cracks that penetrate the concrete with flexible injection resins. Plug concentrated water seepage with Hydroplug.
    3. Pre-wet the surface. Saturate the substrate with clean water until a saturated surface dry (SSD) condition is reached.
    4. Mix. Pour 6.0 to 6.5 liters of water into a clean vessel and add the 20 kg bag. Mix with a slow speed mixer (300-400 rpm) for 3 to 5 minutes until homogeneous and lump free, rest 3 minutes, then remix briefly. Mix only what can be used within 30 minutes and stir frequently.
    5. Apply the first coat. Brush on the first coat at 1.75 kg/m². To reinforce the membrane, embed Hydrotex fiber mesh in the first coat while still wet.
    6. Apply the second coat. Within 5 to 8 hours, depending on weather, apply the second coat green on green, perpendicular to the first, at the same rate. A total of 3.5 kg/m² gives a 2.00 mm membrane.
    7. Clean tools. Clean all tools with water before the product hardens. Hardened material can only be removed mechanically.

    Summary of the method in the Hydrocem 1k Flex Technical Data Sheet. Always follow the full TDS on site.

    Standards & Test Methods

    StandardTitleReferenced for
    ASTM D412Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers—TensionTensile strength 4.0 N/mm²
    ASTM D2240Standard Test Method for Rubber Property—Durometer HardnessShore A hardness 30
    EN 1062Paints and varnishes — Coating materials and coating systems for exterior masonry and concreteCrack bridging >0.5 mm
    EN 12390-8Testing hardened concrete — Depth of penetration of water under pressureResistance to water pressure: negative 3 bar, positive 6 bar
    ASTM E96Standard Test Methods for Water Vapor Transmission of MaterialsWater vapor permeability 5 perms
    EN 14891Liquid applied water impermeable products for use beneath ceramic tiling bonded with adhesives — Requirements, test methods, assessment and verification of constancy of performance, classification and markingListed in the TDS
    EN 1504-2Products and systems for the protection and repair of concrete structures — Surface protection systems for concreteListed in the TDS
    EN ISO 7783Paints and varnishes — Determination of water-vapour transmission properties — Cup methodListed in the TDS
    BS 6920Suitability of non-metallic materials and products for use in contact with water intended for human consumption with regard to their effect on the quality of the waterListed in the TDS
    ASTM C836Standard Specification for High Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane for Use with Separate Wearing CourseListed in the TDS

    Standards and test methods as referenced in the Hydrocem 1k Flex Technical Data Sheet. Values in the TDS are typical laboratory results under standard conditions.

    Frequently Asked Questions

    Can Hydrocem 1K Flex be used in contact with potable water?

    Yes. The TDS lists ‘can be used in contact with potable water’ among its advantages, and water tanks and reservoirs among its uses.

    What water pressure can Hydrocem 1K Flex resist?

    Per EN 12390 part 8, it resists 3 bar negative and 6 bar positive water pressure. It can be used as a positive or negative side waterproofing coating.

    What is the coverage of Hydrocem 1K Flex?

    Coverage is 5-6 square meters per 20 kg bag at 2.00 mm DFT. Two coats at 1.75 kg/m² each (3.5 kg/m² total) give a 2.00 mm membrane.

    What are the application temperature and pot life of Hydrocem 1K Flex?

    Apply between +5°C and +35°C. Pot life of the mix is 40 minutes at 25°C, and the TDS advises mixing only what can be used within 30 minutes.

    How long before Hydrocem 1K Flex can be exposed to water?

    The TDS states it is open to water exposure after 7 days. Recoating interval is 4-8 hours.

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