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Newton HydroBond 403 Gas Barrier 1.5m x 20m

£845.00 Ex VAT
£1,014.00 Inc VAT

Self-healing gas barrier membrane from Newton - protects structures from radon, carbon dioxide and hydrocarbons.

HydroBond Externally Applied Waterproofing Membrane and Gas Barrier

HydroBond 403 GB is a self-healing gas barrier and waterproofing membrane from Newton. It is designed to protect all below ground and earth-retained structures from water ingress (Type A) and radon, carbon dioxide and hydrocarbons.

Looking for the standard external waterproofing HydroBond 403 membrane

This durable gas membrane is part of Newton’s HydroBond system. It should be installed in conjunction with Newton 108 HydroBond-LM that is sprayed to the exposed walls of the basement after the temporary formwork is removed. 

403 HydroBond gas membrane features a locking fleece on the inner surface and an external hydrophilic polymer coating. The hydrophilic layer provides self-healing capabilities if the membrane is punctured. The membrane’s locking fleece prevents water tracking as it becomes fully encapsulated and engaged into the newly placed concrete.

Typical uses of HydroBond 403 GB

HydroBond 403 GB is designed for use as a continuous membrane in everything from domestic basements to large civil engineering projects. It can be used in the following applications:

  • permanent rafts or slabs - including concrete blinding, compacted type 1 hardcore, compacted sand

  • wall formwork / piled walls of reinforced concrete and earth-retaining structures - 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.

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

  • Void former

  • Clay heave board

  • Closed-cell flooring grade insulation

  • Newton 410 GeoDrain

Installing a HydroBond 403 Gas Membrane

The following is an overview of the installation of HydroBond 403 gas membrane - please consult the manufacturer's installation manual for further information.

You can read our guide to gas membrane installation for more information.

Other gas membrane products 

•  Single-sided tape

•  Double-sided sealing tape

Permagard - Providing Solutions. Inspiring Confidence.  

Permagard are proud to stock a wide range of Newton membranes and waterproofing products. If you have any questions about Newton HydroBond 403 membrane or the HydroBond System please call our team on 0117 982 3282. 

Browse our full range gas membranes.  



  • Part of the Newton HydroBond System
  • BDA-approved and NHBC accepted waterproofing system
  • Prevents water migration - forms a full mechanical bond to concrete to prevent water migration between the membrane and the structure
  • Self-healing hydrophilic layer
  • 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
  • Provides a durable waterproof covering for the life of the building