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HardieBacker 500 board James Hardie HardieBacker 500 Cement Board for walls and floors delivers superior protection against moisture damage and mold growth. It contains no paper facing, which serves as a food source for mold, or gypsum, which can disintegrate with continuous moisture exposure. HardieBacker board is an ideal choice for wet area walls; its smooth surface may be paint...view more HardieBacker 500 Cement Board for walls and floors delivers superior protection against moisture damage and mold growth. It contains no paper facing, which serves as a food source for mold, or gypsum, which can disintegrate with continuous moisture exposure. HardieBacker board is an ideal choice for wet area walls; its smooth surface may be painted, textured, wallpapered, or tiled. HardieBacker 500 board is available in a 3´x 5´ and 4´x 8´ sheet size and is backed by a limited lifetime product warranty. Manufacturer Keywords: fiber cement wall floor moisture mold tile underlayment backer board 500  view less