ISOLAIR is a rigid wood fibre insulation board manufactured in Golbey, France using a dry defibration process. Softwood fibres are blended with paraffin and polymer binders and pressed into boards. The product is used as roof underlay board and external wall sheathing insulation in timber constructions. Boards are vapour permeable and suitable for breathable envelope systems. Environmental performance is documented in an EN 15804 compliant EPD for dry-process wood fibre boards.