Visqueen A2 Vapour Barrier - Non-combustible vapour control layer

Guidance for specification option:

It is recommended that Visqueen A2 Vapour Barrier and all associated system components should not be used below 0°C.

Guidance for specification option:

• Visqueen A2 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.

Guidance for specification option:

• When sealing the 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.

Guidance for specification option:

• Visqueen A2 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 vapour control performance.
• Where the barrier is to be sealed to timber or metal frame structures, apply a continuous bead of Visqueen Zedex Mastic to all vertical and horizontal studs, head and sole plates, using a seam roller on the barrier to ensure adhesion.
• All joints in the barrier should be lapped by a minimum of 75mm and sealed with Visqueen A2 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 Visqueen A2 Vapour Tape applied centrally over the junction. Failure to suitably connect the barrier to other building elements will severely reduce vapour control and airtightness 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.