Visqueen Vapour Check is an air and vapour control layer (AVCL) and is used in low condensation risk buildings to reduce the risk of interstitial condensation occurring within the structure as well as improving the airtightness of the building.

The membrane restricts the passage of warm, moist air within the building from permeating into the floor, wall or roof structure.

The membrane is designed to be installed to the warm side of floors, walls and roofs.

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

Approvals and Standards

• Air leakage to BS EN 1026:2016
• CE UKCA UKNI Mark EN 13984:2013
• Quality Management System ISO 9001:2015
• Occupational Health and Safety System ISO 45001:2018
• Environmental Management System ISO 14001:2015

System Components

• Visqueen Double Sided Vapour Control Tape, 20mm x 50m
• Visqueen FR Vapour Tapes
• VisqueenPro Single Sided Vapour Edge Tape, 150mm x 15m

Preparation

Ensure surfaces are smooth, clean and dust free. When bonding the membrane to the substrate, e.g. timber or metal stubs, the surface should be dry.

The membrane can be cut with a sharp retractable safety knife or robust scissors.

Installation

Visqueen Vapour Check should be installed in accordance with the recommendations of BS 5250:2021 Management of moisture in buildings - code of practice. The membrane should be installed on the warm side of the insulated structure, with care being taken to ensure that all laps, penetrations and abutments are sealed. The membrane should be continuous in order to ensure optimum vapour control performance.

Where the vapour check is to be fixed to timber or metal studs, apply sufficient strips of Visqueen Double Sided Vapour Tape to the vertical and horizontal studs, head and sole plates, etc to ensure that the membrane remains in position until the plasterboard or construction board is mechanically fixed in position over the membrane. Progressively peel off the tape release film and apply the membrane ensuring adhesion at the tape locations .e.g. by rollering with a seam roller.

All joints in the membrane should be lapped by a minimum of 75mm and sealed with Visqueen FR Single Sided Vapour Tape applied equidistant over the lap. To aid formation laps should be made over a solid substrate.

Ensure membrane continuity at the junction of horizontal and vertical substrates. Seal abutments with VisqueenPro Vapour Edge Tape applied centrally over the junction. Failure to suitably connect the membrane to other building elements will severely reduce vapour control performance.

Ensure the membrane is not damaged in service due to residual heat from light fittings. The barrier should not be subjected to gravity forces (unsupported) such as on the underside of roof decks or the underside of floor structures, and should be suitably mechanically secured to ensure that it remains in position during service.

Visqueen air and vapour control layers (AVCLs) do require permanent mechanical fixing, normally achieved by over-boarding the AVCL with a plasterboard or other construction board.

Usable Temperature Range

It is recommended that Visqueen Vapour Check and all associated system components should not be installed below 0°C.

Additional Information

Care should be taken to prevent the AVCL from becoming punctured, stretched or displaced when installing plasterboard or other construction board over the installed AVCL.