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• Approvals and Standards
• System Components
• Storage and Handling
• Preparation
• Installation
• Usable Temperature Range
• Additional Information

Approvals and Standards

• Conforms to the specification requirements of BS 8485:2015 + A1:2019
• Suitable for all Characteristic Gas Situation (CS) ground gas regimes
• Conforms to the specification requirements of NHBC Amber 1 and Amber 2 applications
• Conforms to the specification requirements of BR 211:2023
• CE Mark EN 13967:2017
• Quality Management System ISO 9001:2015
• Occupational Health and Safety System ISO 45001:2018
• Environmental Management System ISO 14001:2015

System Components

• VisqueenPro Detailing Strip, 300mm x 10m, 500mm x 10m

Storage and Handling

Visqueen Liquid Gas Membrane should be stored upright, undercover and in its original packaging. Store at temperatures between 5ºC and 35ºC. Temperatures below 5ºC will render the products unfit for use.

To avoid the risk of spillage, always store and transport in a secure upright position. The product has a minimum shelf life of 12 months.

Keep the container closed when not in use.

Care should be taken when handling the product in line with current manual handling regulations.

Preparation

Visqueen Liquid Gas Membrane system should be applied to substrates that are smooth, clean, and free from frost, dust, laitance, loose material and standing water. Any surface contamination e.g. oil, paint, mortar snots, fungal growth, etc should be removed. All substrate cracks, or surface irregularities should be repaired and filled prior to product application. Masonry units should be flush pointed.

Movement joints should be provided with a waterstop/sealant system to an engineer’s specification.

Visqueen Liquid Gas Membrane should be stirred for 5 minutes before use using a slow speed paddle stirrer. Re-stir every two hours. Apply with a brush or roller. Brushes and rollers can be cleaned with water immediately after use. Brushes and rollers contaminated with dry product are not reusable and must be disposed appropriately after use.

The system should not be applied during rainfall or when rain is expected before the membrane has fully cured.

Installation

Visqueen Liquid Gas Membrane can be applied directly from the tin using a brush, or transferred to a more appropriate container and applied by roller. Do not pour directly onto the surface.

The liquid is suitable for use on insulated concrete formwork (ICF) as a priming solution to provide the optimum surface prior to the application of Visqueen Self Adhesive Membrane, Visqueen Gas Resistant Self Adhesive Membrane or VisqueenPro Detailing Strip. For this specific application, apply one coat at a coverage rate of at least 0.25 litre/m² and allow to dry.

For damp proofing applications or waterproofing applications, apply two coats. Apply the first at a coverage of at least 0.5 litre/m² and the second at a coverage of at least 0.7 litre/m². Allow each coat to dry and cure through before applying the next. Total coverage for these applications is at least 1.2 litre/m².

For gas proofing applications apply three coats at a coverage rate of at least 0.8 litre/m²/coat. Allow each coat to dry and cure through before applying the next. Total coverage for this application is at least 2.4 litre/m². Each coat of the product will dry in approximately 6 hours depending upon humidity, ventilation and temperature. High humidity, poor ventilation and/or cool temperatures will slow down the drying process. Visually the membrane will turn black as it dries.

Apply successive coats at right angles to the previous coat. To reduce risk of inter-layer contamination, apply successive coats within 24 hours.

Construction joints should be reinforced with VisqueenPro Detailing Strip once all the coats of the membrane have been applied and each have fully dried.

In order to form an effective seal with any adjacent sheet membranes e.g. Visqueen Gas Barrier, form a butt joint with the dried Visqueen Liquid Gas Membrane and seal the junction with VisqueenPro Detailing Strip bonded 150mm onto each material.

When used to provide a vertical damp proof membrane to the internal face of existing above-ground walls showing damp ingress, apply an additional coat of Visqueen Liquid Gas Membrane to the dried membrane and blind with clean sharp sand whilst tacky. When fully dry, a finish of minimum 12mm gypsum based plaster system should be applied before decorating.

In all cases, Visqueen Liquid Gas Membrane should be covered by an approved protection layer as soon as possible after the coats have been applied and each have fully dried.

Usable Temperature Range

It is recommended that Visqueen Liquid Gas Membrane should not be installed below 5°C or when temperatures can be expected to fall below 5ºC before the membrane has dried. Temperatures below 5ºC will render the products unfit for use.

Additional Information

Visqueen Liquid Gas Membrane is not designed for use as a gas or damp proof course (DPC) or to pass through structural zones where a concrete to concrete bond is required e.g. pile heads or shear walls.

For additional information contact Rawlins Technical on 0113 2455450 (option 2) or send a message to [email protected]