Powerbase MultiGas 500 - Methane, Radon & CO2 Gas Protection Membrane - 2m x 50m roll

Powerbase MultiGas 500 is a high‑performance, reinforced ground‑gas protection membrane designed for developments requiring enhanced resistance to methane, carbon dioxide and radon. With its increased thickness and strength, it is suited to medium‑ to higher‑risk sites, offering a tougher, more durable barrier than lighter‑grade membranes such as Powerbase MultiGas 300.

Powerbase MultiGas 500 is a 500‑micron reinforced polyethylene membrane engineered to deliver superior gas‑tightness, tear resistance and puncture strength. Its heavier‑duty construction makes it ideal for projects where the membrane may be exposed to more demanding site conditions or where a higher level of protection is required under BS 8485. The membrane forms part of a complete gas‑protection system when installed with compatible sealing products such as Powerbond Butyl Tape or Powerlon FlameOut Tape. When correctly detailed and sealed, it provides a continuous barrier beneath concrete slabs, structural floors and ground‑bearing constructions.

Powerbase MultiGas 500 is the stronger, more resilient option for projects that demand a higher level of protection than standard membranes. Its combination of thickness, reinforcement and gas‑resistance makes it a dependable choice for challenging ground conditions and BS 8485‑compliant designs.

CHARACTERISTICS

• Enhanced multi‑gas resistance including methane, CO₂ and radon.
• 500‑micron reinforced polyethylene for superior durability.
• High tear and puncture resistance, ideal for tougher site conditions.
• Suitable for BS 8485 gas‑protection strategies, including higher‑risk classifications.
• Compatible with welded or taped joints for continuous protection.
• Flexible enough for detailing, yet robust for long‑term performance.
• Reliable choice for medium‑ to high‑risk brownfield sites.

APPLICATION

• Medium‑ to high‑risk brownfield developments
• Commercial and industrial buildings
• Sub‑slab protection beneath reinforced concrete floors
• Radon‑affected areas requiring a more robust barrier
• Sites with elevated methane or CO₂ concentrations
• Use within multi‑layer gas‑protection systems for BS 8485 compliance