Kingspan Kooltherm K5 External Wall Board is a premium performance insulation solution for installation on external walls. Made up of a fibre-free thermoset phenolic core, this rigid insulation board is suitable for use behind traditional and lightweight polymer modified renders and dry cladding systems. Kooltherm K5 insulation boards have a glass tissue face on either side, and are resistant to the passage of water vapour. They are manufactured using a low GWP blowing agent that has zero ODP. With a lambda value of 0.20 W/mK, these 60mm phenolic boards are highly thermally efficient when compared with other insulation boards. Kingspan K5 external wall boards are 1200mm x 600mm in size, making them lightweight and easy to handle and install. They are sold in packs that are wrapped in plastic.