Powerbase® Multigas Barriers - Protection Against CO2, Methane & Radon - Gas Barrier Membranes

Powerbase® Multigas Barriers are high specification multilayered reinforced LDPE gas barrier membranes for protection against CO², methane and radon.

Storage and handling:

Store in dry, cool conditions, away from direct sunlight. Handle with care to avoid any scuffing or punctures.

Installation:

• Installation should be performed in conjunction with the design details.
• The membrane should not be exposed to sunlight or weathering for prolonged periods. In cooler periods the barrier becomes less supple and installations should be avoided whenever temperatures fall below 5°C.
• Make sure that no damage occurs when laying the Powerbase® Multigas. Membranes should be laid before any internal walls are built.
• Membranes should be protected using protection boards, or sheeting over the whole area, or by immediately laying the upper slab or floor screed.
• Panels should be installed on a layer of level sand or concrete blinding across the whole floor area. Whilst pre-fabricated panels are normally supplied, continuity of membranes can be achieved by joining separate membrane panels or rolls by welding or taping. Welding is the preferred as it provides a stronger joint.
• Joins should only be made where the barrier is supported. Membranes should be laid loosely and not pulled taut. Rolls or panels may be joined by either taping or welding.
• Powerbond Butyl Tape should be used within a 150 mm overlap. All joins should be firmly pressed together using a hand-held pressure roller.
• Additionally for methane protection, 75 mm Powerbond Foil Tape must be used to seal the overlap.
• All corners of the membrane should be sealed with Powerbond Single-sided Detailing Tape 1000 mm to provide improved protection.
• Concrete columns and masonry surfaces must be primed with Powerbond Primer before sealing.
• If reinforced concrete is being used, the wire reinforcements must be positioned so that they do not come into contact with the barrier.
• Gas tight seals are required around service penetrations.
• Top hats should be used for sealing around pipes. Top Hats should be sealed to the membrane and pipework using Powerbond Butyl Tape. The top hat base and top edge should be sealed with 75 mm Powerbond Foil Tape.
• 1000 mm Powerbond Single-sided Detailing Foil Tape should be used for corners and other detailing.
• Vent pipes should be sealed using Powerbond Butyl Tape.
• Prior to laying the upper slab or floor screed the membrane should be inspected for damage.