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  3. Kooltherm K21 N Rainscreen Board
Illustration of a pink insulation board (Kingspan Kooltherm® K21 N) for ventilated façades, featuring a rigid fibre-free phenolic core and a black surface facing on one side. The board is shown as a single rectangular insulation panel in perspective view, highlighting its slim profile, uniform construction, and smooth surface finish designed for façade applications.
Illustration of a ventilated façade construction featuring a Kingspan Kooltherm® K21 N insulation board with a black facer. The insulation board is installed on the exterior of a concrete wall and positioned behind horizontal timber cladding mounted on timber battens, creating a ventilated cavity. The cutaway view highlights the concrete substrate, insulation layer, support battens, ventilation cavity, and timber façade cladding.
Illustration of a ventilated brick façade construction featuring a Kingspan Kooltherm® K21 N insulation board with a black facer. The insulation board is installed on the exterior of a concrete wall and secured with mechanical fixings. An outer brick façade is supported by wall ties, creating a ventilated cavity between the insulation and brickwork. The cutaway view highlights the concrete substrate, insulation layer, cavity, wall ties, and brick cladding.

Kooltherm K21 N Rainscreen Board

Kooltherm K21 N Rainscreen Board is a phenolic foam insulation board with a fiber-free core. It has a permeable mineral coated glass tissue facer on the back and a black expandable graphite, glass tissue complex facer on the front side. This facer expands when in touch with fire and creates a protective layer to help limit the spread of the fire. The board is vapor diffusion open, meaning it can help to significantly reduces the build-up of water vapor in the construction.

Product Highlights

  • Reaction to fire (EN 13501-1): B-s1,d0

  • λD-value 0,021 W/(m·K)

  • Vapor diffusion open

  • Expandable facer creates a protective layer to help limit the spread of the fire

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

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

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

     

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