Foil faced vapour barrier
Accreditation : BS 1521 A1F

Sisalkraft 714 is a foil-faced waterproof Building paper meeting the requirements of BS 1521 A1F. It is used as a vapour barrier membrane in walls and ceilings of insulated building structures, to reduce or prevent interstitial condensation.

Construction

Sisalkraft 714 is a foil-faced waterproof building paper, with two plies of kraft paper laminated together with bitumen, reinforced with glass fibre yarn, and faced with a pure aluminium foil having a bright reflective surface.

Technical Data

Basis Weight (g/m2)		334 g
Tensile Strength	-MD	16.0 kN/m
	-CD	7.0 kN/m
MVTR		0.06 g/m2/d
Vapour Resistance		3420 MNs/g

Fixing/Sitework

Store rolls before use on end on a clean, dry surface protected from the weather. Material should not be unrolled if the temperature is below 5°C as the adhesive will become brittle and may crack.

Sisalkraft 714 is fixed internally on the warm side of the insulated structure. It should be nailed or stapled to the inside face of the studwork or framing. Welt or seal all laps with butyl double-sided tape or with a suitable waterproof building tape and repair any holes or service penetrations to give a continuous vapourproof barrier. The internal cladding, for example plasterboard, can then be nailed through the VB to the studs or framework.

A correctly specified and installed vapour barrier will assist in meeting the requirements of BS 5250:1989 Control of condensation in buildings.

Availability

Standard Roll Size	1000mm x 25m	1000mm x 50m
Roll Weight	9 kg	17 kg

All information given in good faith and is believed to be accurate. Technical data is based on laboratory testing and represents average values. Specific lots may vary above or below these values.