The Insul-Drain board is a Foamular® extruded polystyrene (XPS) product that incorporates the features of insulation, drainage and protection board in a single product. Precision-cut channels drain water from vertical foundation walls while completing total insulation envelope. It's easy to install, without the need for special tools or equipment, and the product's compressive strength and long-term moisture resistance properties mean years of reliable performance on below grade foundation walls even under extremely harsh conditions.