Description
Visqueen Gas Barrier – High-Performance Gas, Radon & Damp Protection Membrane
The Visqueen Gas Barrier is a multi-layer reinforced polyethylene membrane with aluminium foil core, designed to protect buildings from ground gases, radon, and moisture ingress.
With full compliance to UK standards and third-party certification, it provides a reliable, high-performance solution for modern construction projects.
Key Features & Benefits
- BBA Certified – Third-party accredited for proven performance
- Gas Protection – Protects against methane, carbon dioxide & radon
- Dual Functionality – Acts as both a gas barrier and damp proof membrane
- Standards Compliant – Meets BS 8485:2015 + A1:2019 requirements
- NHBC Approved – Suitable for Type A membrane applications (NF94 guidance)
- Flexible Jointing Options – Heat welded or taped lap joints
- High Durability – Reinforced structure with aluminium foil layer
Product Overview
- Material: Multi-layer reinforced polyethylene with 20μ aluminium foil
- Colour: Blue (top surface) / Silver (reverse)
- Roll Size: 2m x 50m (single wound)
- Thickness: ~0.52mm
- Mass: 400 g/m²
Performance & Compliance
- Methane Gas Transmission: Meets BS 8485 requirements
- Watertightness: Pass at 2kPa (24 hours)
- Low Temperature Flexibility: Down to -40°C
- Water Vapour Resistance: SD value up to 47,700m
- Durability: Resistant to ageing and chemical exposure
✔ Suitable for all Characteristic Gas Situations (CS)
Applications
- Ground gas protection in residential and commercial buildings
- Radon barrier systems
- Damp proof membrane (DPM) applications
- Use above or below concrete slabs
- Beam & block or suspended floor systems
✔ Ideal for new builds and refurbishment projects
Installation Overview
- Install on a smooth, prepared substrate (sand blinding or concrete)
- Lay membrane blue side facing upwards
- Overlap joints by minimum 150mm
- Seal using:
- Double-sided jointing tape + lap tape
- OR heat welding
- Seal all penetrations using:
- Top hat units or detailing strips
- Protect immediately with temporary protection layer
Important Installation Notes
- Do not install in contact with uncured concrete or screed
- Avoid installation below 5°C (for taped joints)
- Protect from UV exposure and site damage
- Not suitable where hydrostatic pressure is present
System Components
- Jointing tapes (double-sided & lap tapes)
- Detailing strips
- Preformed top hat units
- Protection layers (e.g. TreadGUARD)
Storage & Handling
- Store in original packaging
- Keep dry and away from sunlight and extreme temperatures
- Store horizontally on flat surfaces (do not stack)
- Protect from mechanical damage
Why Choose Visqueen Gas Barrier?
Visqueen is a leading authority in membrane technology, offering:
- Proven compliance with UK regulations
- Advanced multi-layer barrier technology
- Full technical support and design services
- Reliable long-term building protection
✔ Ensures safe, compliant, and durable gas protection
Frequently Asked Questions
What gases does it protect against?
It protects against methane, carbon dioxide, and radon gas ingress.
Can it be used as a damp proof membrane?
Yes, it also functions as a high-performance DPM.
How are joints sealed?
Either by taped lap joints or heat welding, depending on specification.
Where can it be installed?
Above/below slabs or in beam & block and suspended floor systems.
Does it need protection after installation?
Yes, it should be covered immediately to prevent damage and UV exposure.
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