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Products / Interior / HardieBacker® 1/4" Board

HardieBacker 1/4'' 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 board is available in a 3´x 5´ and 4´x 8´ size; the 3´x 5´ sheet 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.

HardieBacker 1/4'' Cement Board, with EZ Grid Technology

HardieBacker 1/4''
Thickness: 1/4"
Weight: 1.9 lbs./sq. ft.
3' x 5' features EZ Grid Technology

3' x 5'
4' x 8'

HardieBacker Cement Board with Moldblock® Technology
Product Specifications

Basic Composition/Size

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)
  • 4'x 8'
  • 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.


HardieBacker cement board is recognized as an interior substrate according to the following:

Flexural Strength

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


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
Fuel Contributed
Smoke Developed

Thermal Resistance

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

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