HardieBacker Cement Board - 1/4"

The 1/4" HardieBacker Cement Board for floors and countertops is America's best selling 1/4'' board. Produced with James Hardie's proprietary cement formulation, this no-mesh board is the lightest cement board available and cuts easily, even in tight, awkward spaces. HardieBacker Cement Board is available in a 3' x 5' size which features the exclusive EZ Grid® recessed fastener pattern to make installation even easier. HardieBacker Board provides superior protection against moisture damage and mold growth and is backed by a limited lifetime product warranty.

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

• 1/4" Sheet Size
• 3' x 5' (EZ Grid® board with recessed fastener pattern)
• Thickness: 1/4"
• Weight: 1.9 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

90% Portland cement and sand, no loose aggregate or filler, highest flexural strength and up to 3x the compressive strength of competitive cement boards.
Installs better - Easy to cut to any size and clean cuts allow edges to align tightly and less dust and debris when cut.
Unique cement formulation and MoldBlock® technology provides outstanding mold and moisture resistance, excellent tile adhesion to help protect tile work.

Download Installation Guide