Powerbase MultiGas 300 - Methane, Radon & CO2 Gas Protection Membrane - 2m x 50m roll

Powerbase MultiGas 300 is a high‑performance ground‑gas protection membrane designed to resist a wide spectrum of hazardous gases, including methane, carbon dioxide, radon and low‑level hydrocarbons. It is engineered for use beneath floor slabs and in ground‑bearing applications where reliable, compliant protection is required on brownfield, redevelopment and mixed‑use sites.

Powerbase MultiGas 300 is a durable, reinforced polyethylene membrane manufactured to provide enhanced gas‑resistance while remaining robust enough for typical construction environments. With a nominal thickness of 300 microns, it offers a balance of strength, flexibility and gas‑tightness, making it suitable for a wide range of building types. The membrane forms part of a complete ground‑gas protection system, typically installed with sealed laps using compatible tapes such as Powerbond Butyl Tape or Powerlon FlameOut Tape where fire performance is also required. When correctly installed, it contributes to BS 8485‑compliant gas protection strategies.

Powerbase MultiGas 300 is suitable for use in residential, commercial and industrial developments, particularly where methane and CO₂ are present at moderate concentrations. Powerbase MultiGas 300 is a reliable, cost‑effective membrane for projects requiring protection from common ground gases without the need for a full hydrocarbon‑resistant system. Its combination of durability, flexibility and compliance with UK gas‑protection standards makes it a trusted choice for developers and specifiers.

CHARACTERISTICS

• Multi‑gas resistance including methane, CO₂ and radon.
• Reinforced polyethylene construction for improved tear and puncture resistance.
• Nominal 300‑micron thickness offering reliable gas‑tight performance.
• Compatible with welded or taped joints for continuous protection.
• Suitable for BS 8485 gas‑protection designs (Green to Amber risk levels).
• Lightweight and flexible, making installation straightforward.
• Cost‑effective solution for low‑ to medium‑risk contaminated sites.

APPLICATION

• Housing developments on moderate‑risk brownfield land
• Commercial and industrial buildings
• Sub‑slab protection beneath concrete floors
• Radon‑affected areas
• Sites requiring methane and CO₂ protection
• Use as part of a multi‑layer gas‑protection system