NBS Source

Application

Suitable for buildings where an air and vapour control layer is required.

Description

A multi-layer reinforced aluminium AVCL barrier.


The barrier has a reflective aluminium finish on the upper surface and a matt aluminium surface on the reverse. The barrier is supplied in single wound rolls (not folded), 1.5 x 50 m long.


Features and benefits:


  • Achieves a reaction to fire classification A2 - s1, d0 to BS EN 13501-1: 2018.
  • Versatile application - used within floor, wall and roof constructions.
  • Single wound - rapid installation.
  • The barrier restricts the passage of warm, moist air within the building from permeating into the floor, wall or roof structure.
  • Compliant with UK Building Regulations.
  • The barrier is designed to be installed to the warm side of floors, walls and roofs and is suitable for humidity classes 1, 2, 3, 4 and 5 to BS 5250: 2021.

General information

Finish

Reflective

Upper side

Matt

Reverse side

Color

Silver

Material

Aluminium

Shape

Roll.

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Size

1.5 x 50 m

WarrantyDescription

See Visqueen's Warranty statement.

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Uniclass 2015

Pr_25_57_10_94 Vapour permeable sheetsPrimary

CAWS

H11/785 Air and vapour control layer

J42/395 Air and vapour control layer

H92/450 Air and Vapour control layer

H30/30 Air and vapour control membrane

H31/261 Air and vapour control membrane

H31/45 Air and vapour control membrane

H30/261 Air and vapour control membrane

Specification data - Vapour permeable sheets Enhanced data

Standard

To BS 5250: 2021, EN 13984: 2013.

Performance characteristics

Reaction to fire classification A2 - s1, d0 to BS EN 13501-1:2018.

Class (minimum)

W1 (watertight) - 165 g/m².

Material

Aluminium.

Form

Reinforced.

Third-party certification

Compliant with UK Building Regulations.

Weight (minimum)

165 g/m².

Reflective face

Included.

Dimensions

50 x 1.5 m.

Minimum operational temperature

0°C.

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

Tensile strength MD/CD

>700 N/ 50 mm.

Elongation MD/CD

>2.5%.

Reaction to fire classification

A2 - s1, d0 to BS EN 13501-1:2018.

Durability

EN 1296 and EN 1928.

Pass.

Tear resistance MD/CD

EN 12310-1.

Md: N>150 N; Cd: N>120 N.

Water vapour transmission

EN 1931.

>1500 m.

Accessories

None.

Visqueen Zedex Mastic, 380 ml.

Visqueen A2 Vapour Tape, 75 mm x 25 m.

Handling

Manufacturer's standard.

  • 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.

Preparation

Manufacturer's standard.

  • 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.

Installation

Manufacturer's standard.

  • 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.

Environmental information

Country of product manufacture

Finland