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´ sheet size and is backed by a limited lifetime product warranty.

Basic Composition/Size
90% Portland cement and ground sand. HardieBacker™ board contains no asbestos, glass mesh, formaldehyde, or gypsum.

Sheet Size:

3'x 5'

Thickness: 0.42"

Weight: 2.6 lbs/sq.ft.

Mold Resistance
HardieBacker products achieve a perfect score on both industry standard mold tests. HardieBacker board scores a 0 (best possible score) on the ASTM G21 for mold resistance and a 10 (best possible score) on the ASTM D3273 test against mold growth.

Flexural Strength
Based on typical Equilibrium Moisture Content: 2100 psi when tested in accordance with ASTM test method C1185.

Non-Combustibility
HardieBacker™ cement board is recognized for use in non-combustible construction in NER-405.

Surface Burning Characteristics
When tested in accordance with ASTM test method E-84:

Flame Spread: 0

Fuel Contributed: 0

Smoke Developed: 5

Thermal Resistance
(Approximate value) 1/4'' thick: R:0.13