Visqueen Vapour Check

Product Name
Visqueen Vapour Check
Product Type
Vapour & Air Leakage

Product Spec Sheet

Description

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Visqueen Vapour Check is used to omit the risk of interstitial condensation within a structure as well as improving the air tightness of the building. Visqueen Vapour Check restricts the passage of warm, moist air from within the building from permeating into the structure or the roof. Visqueen Vapour Check is manufactured using virgin polyethylene.

Suitable for preventing condensation in buildings which can lower the performance of insulation:

• Used within floor, wall and roof applications

• Vapour resistance of 266MNs/g

• Helps to prevent mould and damp staining

Application

The control of condensation to within safe limits is an important consideration in the design and construction of buildings. The occupants of a building and their associated activities produce water vapour which, if unmanaged, can condense within or between building elements, this process is referred to as interstitial condensation. This condensation can have serious detrimental effects upon the fabric of the building such as causing the decay of timber elements and corrosion of metal components and reducing the thermal effectiveness of insulating materials. With the progressive increases in thermal efficiencies of buildings in order to reduce energy usage, any reduction in the effectiveness of the installed insulation can have long term financial implications. The negative effect upon the fabric of the building increases the incidence of moulds and mildews, which in turn can have a harmful effect upon the health of the building occupants.

Visqueen Vapour Check provides a means of protecting the warm side of the thermal insulation incorporated in a building by creating a barrier to the movement of warm, moist air. Visqueen Vapour Check is a loose laid membrane designed for use in roofs, walls and floors subjected to humidity levels less than 50% at 15 degrees Celsius (BS5250: 2002 class 1 condition) e.g. warehouses, industrial units and storage areas

Visqueen Vapour Check should be installed in accordance with the recommendations of BS5250: 2002 ‘Code of practice for control of condensation in buildings’. Visqueen Vapour Check should be installed on the "warm" side of the insulated structure, with special care being taken to ensure that all seams and holes are sealed effectively. Thus rendering the whole structure moisture and vapour proof and improving thermal performance. It is important that Visqueen Vapour Check should be continuous in order to prevent vapour entering the floor, wall or the roof.

Jointing Tapes

Ensure all surfaces are clean, smooth and dry prior to the application of Visqueen Vapour Tape or Visqueen Vapour Edge Tape. Surfaces do not require priming prior to tape application. For total protection, all joints in the vapour control layer should be lapped by a minimum of 75mm, and sealed with Visqueen Vapour Tape applied equidistant over the lap. To aid formation, laps should be made over a solid substrate.

For protecting and sealing the perimeter, Visqueen Vapour Edge Tape should be used. Where perimeter detailing involves sealing to masonry units such as brickwork, blockwork, etc ensure vapour proof continuity by sealing with Visqueen Vapour Edge Tape applied equidistant over the junction.

Visqueen Vapour Tapes are coated with a special cold weather adhesive system which combines superior quick stick at normal temperatures with superior low temperature performance below freezing. The tapes are highly puncture and tear resistant. Failure to suitably connect the vapour control layer to other building elements will seriously reduce performance.