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HydroBond 403 Plus

  1. Dynamic Waterproofing Solution: HydroBond 403 Plus is a high-performance, self-healing membrane with BDA approval and NHBC acceptance. It ensures Type A waterproofing, resisting radon, CO2, and hydrocarbons for all below-ground structures, from basements to civil engineering projects.
  2. Complete Envelope Protection: Achieve Grades 1, 2, and 3 waterproofing with HydroBond 403 Plus, seamlessly integrating into the HydroBond® System. It provides a durable barrier against water ingress, gas infiltration, and other threats, backed by BDA and NHBC certifications.
  3. 60-Year Waterproof Assurance: When combined with other Newton products, HydroBond 403 Plus offers a coordinated approach for whole-structure waterproofing. With an expected building lifespan of at least 60 years, it ensures long-lasting protection against water and gas for the life of the structure.

A high performance, self-healing membrane with a locking fleece on the inner surface and a hydrophilic polymer coating externally. The membrane is BDA approved, NHBC accepted as Type A waterproofing, and the gas barrier variant provides resistance to radon, carbon dioxide and hydrocarbons.

HydroBond 403 Plus provides a complete waterproof envelope to the structure to achieve Type A (barrier) waterproofing suitable for Grades 1, 2 and 3 as defined by BS 8102:2022, are suitable for all below ground and earth-retained structures from domestic basements to the largest civil engineering projects, and can be used as part of the HydroBond® System with HydroBond 108-LM which is sprayed to the exposed walls of the basement after the temporary formwork is removed. Where space is tight, HydroBond 109-LM can be applied by roller or brush or small airless spray machine.

HydroBond 403 Plus can be used in conjunction with other Newton products to provide a coordinated and combined approach to the waterproofing of the whole structure that includes protection against water ingress to the deck, through construction joints, through and around service entries and to movement joints.

Correctly protected, the Newton HydroBond System will provide, under normal service conditions, a durable waterproof barrier for the life of the building to which it is installed; the expected lifetime of the building itself should be at least 60 years. The Newton HydroBond System is supported by BDA Agrément Certificate BAB 16-031/03/A and is accepted by the NHBC as a suitable waterproofing system for Type A Waterproofing to Grades 1, 2 & 3 – BS 8102:2022

  • Key Benefits
  • Typical Applications
  • Suitable Substrate
  • Technical Data
  • FAQ
  • Key Benefits

    Key Benefits

    • Agrément certified and NHBC accepted waterproofing system.
    • Forms a full mechanical bond to concrete to prevent water migration between the membrane and the structure.
    • The hydrophilic layer provides self-healing capabilities when the membrane is punctured.
    • Very flexible – resistant to movement and fissures in substrates.
    • Excellent resistance to the high alkalinity of concrete.
    • Third-party test certification for radon, carbon dioxide and hydrocarbon gases.
    • The Newton HydroBond™ System completely encapsulates the structure.

    Typical Applications

    Typical Applications

    • As a continuous membrane to permanent raft and wall formwork such as the raft blinding and piled walls of reinforced concrete and earth-retained structures.

    Suitable Substrate

    Suitable Substrate


    • Concrete blinding.
    • Compacted type 1 hardcore.
    • Compacted sand.

    The following can be placed above the blinding or hardcore prior to the installation of HydroBond 403 Plus:


    • Existing structure.
    • Secant or contiguous concrete piles.
    • Metal sheet piles.
    • Diaphragm walls.
    • King post wall.
    • Sufficiently stable ground such as clay or chalk.
    • Temporary timber shuttering/formwork.

    Technical Data

    Technical Data

    Installed Performance Results
    Service temperature -40ºC to +100ºC
    Adhesion to concrete 0.4 N/mm²
    Elongation at break (Machine) 20%
    Elongation at break (Traverse) 50%
    Tensile strength (Machine) >250 N/50 mm
    Tensile strength (Traverse) >200 N/50 mm
    Resistance to static loading – 20 kg load Watertight
    Resistance to impact – AI plate – 200 mm drop Watertight
    Resistance to impact – EPS panel – 500 mm drop Watertight
    Joint strength – Glued seam >100 N/50 mm
    Resistance to tearing – Nail shank – MD** >150 N
    Resistance to tearing – Nail shank – Across >150 N
    Resistance to fire Euroclass E
    Water vapour diffusion resistance – Sd value 68m



    What is gas barrier?

    Gas barriers are technological solutions that have the capability to diminish or decelerate the movement of gases and vapors. The primary purpose of obstructing or lessening the migration of gas is to safeguard the contents stored on the opposing side of the barrier.

    Speak to our friendly, expert team

    Our staff are able to provide guidance for projects of all sizes, whether you require some general advice about damp or waterproofing, or support with technical drawings and specifications.

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