Walki®Radon Block / Walki®Methane Tight
Gas-tight protection from the ground up
Barrier membranes for radon, methane and moisture control in groundworks
Control what’s beneath. Protect what’s inside.
Walki’s advanced ground protection membranes are engineered to control harmful gases and moisture at the source – the soil beneath your building.
During the groundworks phase, invisible risks such as radon, methane and water vapour can migrate into indoor environments, compromising air quality, safety and long-term structural performance. Walki barrier membranes create a continuous, high-performance shield that prevents gas ingress while maintaining durability and ease of installation on site.
Designed for modern construction demands, Walki solutions combine robust mechanical strength with proven barrier performance, supporting compliance with building regulations and indoor air quality standards across Europe.
Product overview
Walki®Methane Tight
High-performance multi-gas barrier membrane for demanding ground conditions.
- Barrier against methane, radon and other soil gases
- Aluminium core for enhanced gas-tightness
- Extremely high water vapour resistance (Sd > 1500 m)
- Reinforced structure for durability
- Flexible and easy to install (wide rolls up to 3.2 m)
- Suitable for contaminated land and high-risk sites
Structure:
PE film / scrim / polymer / aluminium foil / polymer / PE film
Technology:
Extrusion laminating
Walki®Radon Block
Reliable and efficient radon barrier for standard residential and commercial projects.
- Effective radon protection
- Watertight and vapour resistant (Sd ~ 290 m)
- Lightweight and flexible
- Reinforced for mechanical performance
- Easy handling and installation
Structure:
PE film / scrim / polymer / PE film
Technology:
Extrusion laminating
| Feature | Walki®Methane Tight | Walki®Radon Block |
|---|---|---|
| Gas protection | Methane, radon, other gases | Radon |
| Barrier layer | Aluminium core | Polymer-based |
| Vapour resistance | Very high (Sd > 1500 m) | High (Sd ~ 290 m) |
| Application | Contaminated or high-risk land | Standard radon-risk areas |
| Durability | Mechanical and chemical resistance | Strong and flexible |
| Cost efficiency | Premium performance | Cost-effective solution |
Who is
it for
Walki barrier membranes are designed for:
Construction companies and contractors
Groundworks specialists
Architects and specifiers
Property developers
Building material distributors
Infrastructure and civil engineering projects
Customisation capabilities
Walki offers extensive flexibility to match project-specific requirements:
- Tailored barrier levels (gas and vapour)
- Multi-layer structures with or without aluminium
- Roll widths, thicknesses and formats
- Enhanced mechanical strength or puncture resistance
- Printability for branding or installation guidance
- Integration with sealing systems and accessories
What makes Walki different
Engineered barrier performance
Advanced multilayer structures deliver reliable gas and vapour resistance, even in demanding soil conditions
Ease of installation
Flexible, lightweight materials reduce installation time and risk of errors on site
Wide roll formats
Fewer joints, faster coverage and improved sealing integrity.
Consistent quality
Manufactured using controlled extrusion lamination for uniform performance.
Future-ready construction
Supports healthier indoor environments and compliance with evolving building standards.
Walki vs alternatives
| Criteria | Walki barrier membranes | No gas-barrier membranes |
|---|---|---|
| Gas protection | High (tested, multi-layer) | None |
| Damp control | Excellent | Good |
| Durability | Reinforced, tear-resistant | Moderate |
| Installation | Easy, wide rolls | Easy, wide rolls |
| Indoor air protection | High | Poor |
A gas barrier membrane is a protective layer installed during groundworks to prevent gases like radon and methane from entering a building through the soil.
Radon is a naturally occurring radioactive gas linked to lung cancer. Preventing its entry improves indoor air quality and occupant safety.
Methane barriers are required in areas with contaminated land, landfill sites or where ground gas risks are identified.
Sd value indicates resistance to water vapour diffusion. Higher values mean stronger vapour barrier performance.
Modern membranes like Walki solutions are designed to be flexible, lightweight and available in wide rolls, making installation efficient and reliable.
Choose the right protection for your project
Whether you are building on radon-prone ground or managing complex gas risks, Walki offers reliable barrier solutions tailored to your needs. Speak with our experts to find the optimal membrane for your application.
