Liquid Gas Membrane
- Flexible, seamless liquid-applied barrier providing protection against methane, radon, CO₂, hydrocarbon vapours, and damp in below-ground structures such as basements, cellars and floor slabs. Below-ground walls require a suitable waterproofing system before Liquid Gas Membrane is applied as the gas, radon and damp-proof barrier.
- Water-based, low‑VOC membrane designed for professional application in confined or occupied environments, serving as a resilient pre-screed layer over properly prepared damaged or porous floors before applying cementitious or latex self-levelling screeds.
- Versatile damp and moisture control solution suitable for masonry substrates including brickwork, blockwork and stone, offering a practical liquid-applied alternative where sheet membranes are difficult to install.
- Durable internal waterproofing and containment lining for wet rooms, bathrooms, kitchens, agricultural silage pits, and industrial effluent tanks. Supplied in grey and suitable for application by brush, roller or airless spray.
Technical Overview
Newton Liquid Gas Membrane is a single‑component, liquid‑applied barrier designed for professional use in applications requiring protection against ground gases and moisture. Suitable substrates include concrete, cement screeds, brickwork, blockwork, stone, and plaster. It can be applied to walls, floors, and ceilings using a brush, roller, or airless spray. The membrane is installed in two coats at approximately 0.7 kg/m² per coat to achieve a total dry film thickness of 0.6 mm, with a 15 kg unit covering approximately 10.5 m². Additional material may be required where the product is used as its own primer on weak or porous surfaces.
Once cured, it forms a flexible, seamless layer that resists methane, radon, carbon dioxide and hydrocarbon vapours, and water ingress. This makes it ideal for below‑ground gas and damp protection, pre‑screed preparation on porous or damaged floors, and moisture control on masonry substrates. Its liquid‑applied nature provides a practical alternative to sheet membranes, especially where detailing or access limitations exist. It is also suitable as an internal waterproofing layer beneath tile systems in wet rooms, bathrooms, kitchens and other intermittently wet areas, such as silage pits and effluent tanks.
For below-ground wall applications, waterproofing must first be provided by a suitable waterproofing system. Liquid Gas Membrane is then applied as the gas, radon and damp-proof barrier. Its internal laboratory water-resistance test was not undertaken to a recognised waterproofing standard and does not establish suitability as a standalone Type A waterproofing system. Where hydrostatic water pressure is present, suitable waterproofing protection must be provided separately. For internal below-ground applications, the TDS specifies a Newton HydroCoat Type A waterproofing system installed first, followed by Liquid Gas Membrane where gas protection is required.
The membrane is supplied in grey and has a low VOC content of less than 5 g/litre. At 20°C, it is typically touch-dry within one hour and fully cured within 3–5 days; curing times vary with temperature. It offers adhesion to prepared concrete of 1.1 N/mm², elongation at break of 350%, and low permeability to water vapour and ground gases. When applied in accordance with the TDS and protected within the building structure, the cured membrane is designed to provide long-term service consistent with the surrounding construction.
