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  3. Kooltherm K21 Rainscreen Board
Illustration of a pink insulation board (Kingspan Kooltherm® K21) for ventilated façades, featuring a black surface facing. The board is shown as a single rectangular insulation panel in perspective view, highlighting its slim profile.
Illustration of a ventilated façade construction featuring a Kingspan Kooltherm® K21 insulation board with a black facer. The insulation board is mechanically fixed to a concrete block wall and installed behind façade panels mounted on a metal subframe, creating a ventilated cavity.

Kooltherm K21 Rainscreen Board

Kooltherm K21 Rainscreen Board is a phenolic foam insulation board with a fiber-free core. It has a permeable non-woven glass fibre facer on the back and a black perforated alu multilayer facer on the front . The board is vapor diffusion-inhibiting, meaning it helps to significantly reduces the build-up of water vapor in the construction. It is ideal for applications where controlling moisture movement is critical to prevent condensation and maintain building integrity.

Product Highlights

  • Reaction to fire (EN 13501-1): B-s3,d0

  • λD-value 0,022 W/(m·K) (20-39mm)

    λD-value 0,021 W/(m·K) (40 -159 mm)

  • Vapor diffusion-inhibiting

  • Ideal for ventilated facades with an open structure, due to the black facer

  • Helps you reach the required U-values with a thinner build-up compared to mineral wool alternatives

  • A thinner build-up results in more daylight and additional floor space

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