Visqueen NF-Vapour Barrier

VCL, separating layer, humidity, 5250, bs5250, moisture, AVCL, barrier, airtightness, airtight ,vapor vapour, 1026, check

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

Visqueen NF-Vapour Barrier is an air and vapour control layer (AVCL) and is used in low, medium and high condensation risk buildings to reduce the risk of interstitial condensation occurring within the structure as well as improving the airtightness of the building. The barrier restricts the passage of warm, moist air from within the building from permeating into the floor, wall or roof structure. The barrier is designed to be installed to the warm side of floors, walls and roofs. It is suitable for all BS 5250:2021 humidity classes including those with high internal humidities e.g. laundries and swimming pools.

Visqueen NF-Vapour Barrier should be stored horizontally, under cover in its original packaging. Care should be taken when handling the product in line with current manual handling regulations.

When bonding Visqueen NF-Vapour Barrier to the substrate, e.g. timber or metal stubs, the surface should be smooth, clean, dry and free from dust or sharp protrusions. The barrier can be cut with a sharp retractable safety knife or robust scissors.

Visqueen NF-Vapour Barrier should be installed in accordance with the recommendations of BS 5250:2021 Management of moisture in buildings - code of practice. The barrier 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 barrier should be continuous in order to ensure optimum performance. Apply Visqueen FR Double Sided Vapour Tape to securely bond the barrier to structural components, including vertical studs, horizontal noggins, head plates, and sole plates. Progressively peel off the tape release film and apply the barrier ensuring adhesion e.g. with a seam roller. This tape contributes to maintaining the integrity of the air and vapour control layer by reducing the potential for air and vapour leakage following the mechanical installation of plasterboard or construction board over the barrier. All joints in the barrier should be lapped by a minimum of 75mm and sealed with Visqueen FR Single Sided Vapour Tape applied centrally over the lap. To aid formation laps should be made over a solid substrate. Ensure barrier 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 barrier to other building elements will severely reduce performance. Ensure the barrier 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) require permanent mechanical fixing, normally achieved by over-boarding the AVCL with a plasterboard or other construction board.

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

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. The information in this datasheet was correct at the time of publication. It is the user’s responsibility to obtain the latest version of the datasheet as it is updated on a regular basis. The information contained in the latest datasheet supersedes all previously published editions.

Refer to the Visqueen NF-Vapour Barrier safety datasheet (SDS).