The HP Recovery Board is a rigid insulating and recovery board. It can be used as a separator layer over an existing roof system or as an insulation overlayment. This dimensionally durable and stable insulation is compatible with all Carlisle Single-Ply Roofing Systems. HP Recovery Board is manufactured using wood fibers and additives to provide a high-strength, lightweight, moisture-resistant cover board. The boards are treated to promote adhesion of roofing membranes and reduce adhesive soak-in.