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HydroBond 2K-Flex


  1. Radon-Certified Strength: HydroBond 2K-Flex, certified for radon gas, forms a tough, flexible barrier. Perfect for external waterproofing, it quickly seals cracks and joints in earth-retaining structures.
  2. Eco-Friendly Flexibility: Environmentally conscious and solvent-free, HydroBond 2K-Flex reacts for a firm, flexible coating. Apply swiftly with a trowel or spray, securing insulation to various surfaces, and drying rapidly.
  3. Complete Defense, Quick Dry: HydroBond 2K-Flex ensures rapid waterproofing. Ideal for securing insulated panels, it works seamlessly with HydroBond 2K-Flex Primer and HydroBond 2K-Flex Mesh for a comprehensive solution.

A radon gas certified, bitumen/rubber waterproofing membrane used primarily for the external waterproofing of earth-retaining structures such as basements and foundation walls. Forms a thick, highly flexible barrier to water ingress that can be applied to fill voids, cracks and joints.

Environmentally friendly and solvent-free, HydroBond 2K-Flex consists of two components; a bitumen emulsion and a reactive powder. These two components chemically react when mixed to produce a firm, yet still highly flexible coating that can be applied by trowel or by airless spray machine. Adhering insulated panels to concrete, masonry and thoroughly dried thick bituminous coatings, 2K-Flex dries quickly and is rain-fast after a short period.

HydroBond 2K-Flex requires two ancillary products, HydroBond 2K-Flex Primer and HydroBond 2K-Flex Mesh.


HydroBond 2K-Flex Primer

A fast-drying bitumen emulsion primer and bonding agent that is applied to the substrate prior to the application of the Newton HydroBond 2K-Flex reinforced bitumen waterproof coating. The product adheres well to concrete, masonry, plaster and most other common construction substrates.


HydroBond 2K-Flex Mesh

A reinforcing mesh made from woven fibreglass yarns and coated with an alkaline resistant latex which prevents the alkaline present in cement from degrading the glass fibre.

  • Key Benefits
  • Typical Waterproofing Applications
  • Technical Data
  • Key Benefits

    Key Benefits

    • Thick coating, fully-bonded seamless waterproofing membrane with excellent crack-bridging capabilities.
    • Particularly easy trowel application due to low material weight.
    • Fast reaction time due to the special powder catalyst.
    • Highly flexible with 2 mm crack bridging due to high-quality polystyrene and polymer modification.
    • Quick-drying and rain-fast after a short period.
    • Solvent-free, non-toxic and odourless.
    • Non-flammable – No VOCs.
    • Radon gas resistance.
    • Sprayable with suitable equipment.
    • Adheres insulating panels to concrete, masonry and thoroughly dried thick bituminous coatings.

    Typical Waterproofing Applications

    Typical Waterproofing Applications

    • Continuous Type A waterproofing and radon protection of retained structures, together with Newton HydroBond pre-applied membranes.
    • Type A waterproofing and radon membrane for basement, foundations and earth-retained walls.
    • Smoothing of irregular surfaces prior to application of bitumen-based membranes.

    Technical Data

    Technical Data

     Cured Performance  Result
    Colour Black
    Membrane thickness – two coats  4.0 mm
    Compressive strength – Class C2A 0.30 MN/mm2
    Crack bridging ability (no reinforcement) – Class CB2  >2 mm
    Resistance to fatigue movement – 1000 actions @ -10°C  Pass
    Dimensional stability at high temperature – no sliding  Pass
    Flexibility at low temperature  Pass
    Water vapour resistance – SD value  26.3 m
    Water vapour resistance – μ value 6575 μ
    Water vapour resistance  132 MNs/g
    Water tightness -W2A  0.075 N/mm2
    Water resistance – 21 days at 21°C  Watertight
    Durability of water tightness and fire behaviour  Pass
    Radon gas diffusion resistance (4 mm membrane)  1.13 x 10-11 m2/s
    Reaction to fire classification (Euroclass) E

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