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A lightweight, reinforced, polyethylene, vapour control layer for use within roof and wall constructions to prevent warm, moist air escaping from inside the building and condensing within the insulation. The woven, polypropylene, multifilament scrim reinforcement provides good resistance to tears and punctures.
Attention to detail: All Vapour Control Layers (VCLs) need to be well-sealed
continuous layers. Care should be taken to seal all laps, penetrations, perimeters,
junctions, and accidental punctures. Ensure substrate surfaces are as clean, dry and dustfree
as possible before beginning installation.
Weather Conditions: Securing lightweight membranes in windy conditions may result in
a poor-quality installation. Appropriate precautions should be taken during installation.
Accessories: Probond Butyl Tape and Profoil Tape.
Mechanical Fixings: Place fixings at 100-150mm centres. If using blown insulation, reduce
fixing centres to 50-100mm.
Penetrations/Openings: VCLs should be cut and neatly formed around openings
and penetrations. The membrane should be made air- and vapour-tight by sealing the
opening with Profoil Tape.
Puncture Damage: For through-membrane punctures, apply a continuous bead of
Probond Butyl Tape around the damaged area and place a generous patch of membrane
over the puncture extending at least 150mm beyond the puncture edge. For minor
scuff-type damage of less than 25mm, Profoil Tape may be used alone to protect the
area without a patch.
Delivery & Site Handling: Rolls are supplied to site with a label clearly identifying
product name and grade. Rolls should be stored flat or upright on a clean, level surface
and kept under cover
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