Premium XPS Polystyrene Board with Quality Certification – Ideal for bathroom tile backer applications. High-density extruded polystyrene ensures superior moisture resistance and thermal insulation. Precision-engineered smooth surface allows effortless tile adhesion and long-lasting durability. Lightweight yet rigid construction simplifies installation while maintaining structural integrity. Certified eco-friendly material meets strict building standards for indoor safety. Perfect for wet environments like showers, tub surrounds, and bathroom floors. Bulk packaging available for contractors and large-scale renovation projects. Direct factory pricing guarantees unbeatable value for professional-grade materials.