Knauf Drywall are one of the UK's leading manufacturers of Plaster, Plasterboard & Drywall Systems. Knauf Drywall products & systems continue to be specified on some of the UK's largest & most prestigious projects. Knauf Wallboard is a standard plasterboard with an ivory paper face ideally suited to receive a plaster finish or for direct decoration. Knauf Plasterboards have a conductivity figure of k = 0.16 W/m K. Knauf Wallboard complies fully with BS EN520 & is categorised as Type A. Price per sheet. Thermal Resistance: 9.5mm = 0.06m 2 K/W 12.5mm = 0.08m 2 K/W 15.0mm = 0.09m 2 K/W