OPTIMA System - Isover

III. Vapour retarder and air tightness layer
To avoid condensation damage in the structure, the vapour retarder and air tightness
layer needs to be installed on the inner facing surface of the insulation layer (= the
warm side; Items 6, 7 & 8 in the illustration on Page 5). This barrier prevents water
vapour passing from the room into the construction.
VARIO KM & VARIO KM Duplex UV –
The intelligent vapour retarder and air tightness membrane
outside inside
In winter, ambient relative humidity outside is lower than inside
a building. VARIO KM / KM Duplex UV closes up to prevent the
penetration of water vapour into the construction (Picture 2).
In short – The Advantages of VARIO KM / KM Duplex UV.
In summer, ambient relative humidity outside is greater than
inside a building. In this case VARIO KM/KM Duplex UV opens up.
In this way any moisture in the construction can move into the
interior of the building (Picture 3).
• Dual functionality – humidity regulation: improved and faster drying out in summer, and secure
barrier in winter
• Reliable functionality with matched components
• Vario KM Duplex UV – ease of work: printed guidelines for easy accurate cutting, and fleece surface for
better adhesion to substrate
All advantages of the OPTIMA System at a glance on Page 19
outside inside
2 3
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