The Celotex PL4000 range of PIR Plasterboard Laminate Multi Application PL4065 2400 x 1200 x 65 + 12.5mm (L x W x T) 11.48 kg/m2, 28 pieces per pallet is a high performance, easy to install polyisocyanurate (PIR) insulation board with a paper facing, laminated to a piece of 12.5mm tapered edge plasterboard. Available in thicknesses 65mm (insulation only), it is suitable for use in roof and internal wall lining applications. Excellent thermal performance with a thermal conductivity of 0.022 W/m.K, reducing the thickness of insulation required to hit the target U-value. brings together both insulation and plasterboard creating a 2-in-1 solution to insulate and dry line walls or roofs at the same time.