HardieBacker® cement board is a tile underlayment made for wet areas like kitchens and bathrooms. This cement-based backer board, made of 90% Portland cement and sand, resists damage from moisture and mold and provides excellent tile adhesion. Its formulation and structure result in the ideal combination of strength, uniform composition and performance that no other backer board can provide. HardieBacker® cement board was made to be easier to work with so that regardless of how you cut your board, the result is less debris. HardieBacker® cement board's superior strength and durability deliver a solid foundation for tile jobs to help protect your work and reputation. James Hardie stands behind HardieBacker® cement board with a limited lifetime product warranty.