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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
Thickness: 1/4"
Weight: 1.9 lbs./sq. ft.
3' x 5' features EZ Grid® Technology
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.
Approvals
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.
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
Fuel Contributed
Smoke Developed
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0
0
5
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Thermal Resistance
(Approximate value) 1/4'' thick: R:0.13
HardieBacker® 1/4'' Cement Board, with EZ Grid® Press & Praise
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HardieBacker® Cement Board with Moldblock™ technology
Limited Lifetime Product Warranty
Download PDF Version
For U.S.
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1. LIMITED WARRANTY:
James Hardie Building Products, Inc. ("Hardie") warrants, (for installation within the U.S. and Puerto Rico) to the purchaser, the first owner of the structure to which the product is applied, and the first transferee of such structure (each a "Covered Person") that HARDIEBACKER® Cement Board with MoldBlock™ technology (hereinafter "Product") is free from defects in materials and workmanship during the life of the Product subject to the terms and conditions of this Limited Warranty.
2. WHAT WE WILL DO:
If during the warranty period any Product proves to be defective, Hardie, in its sole discretion, shall replace or refund the original purchase price of the defective Product. If the original retail cost cannot be established by the Covered Person, the cost shall be determined by Hardie in its sole and reasonable discretion. Hardie's replacement of the defective Product pursuant to Section 2 of this Limited Warranty SHALL BE THE SOLE EXCLUSIVE REMEDY available to a Covered Person with respect to any defect. Hardie will pay for or
reimburse labor costs.
3. WHAT YOU MUST DO/CONDITIONS OF LIMITED WARRANTY:
Warranty coverage under this Limited Warranty shall be subject to the following terms and conditions.
- A Covered Person must provide written notice to Hardie within thirty (30) days after discovery of any claimed defect covered by this Limited Warranty and before beginning any permanent repair. The notice must describe the location and details of the claimed defect and any additional information necessary for Hardie to investigate the claim. Photos of the Product, showing the claimed defect must accompany the notice. A claimant under this Limited Warranty must provide proof to Hardie that such claimant is a Covered Person as defined
in Section 1 above.
- The Product must be installed according to Hardie's printed installation instructions and all building codes adopted by federal, state or local governments or government agencies and applicable to the installation.
- Upon discovery of a claimed defect, a Covered Person must immediately, and at a Covered Person's own expense, provide for protection of all property that could be affected until the claimed defect is remedied if applicable. Before any permanent repair to the Product, a Covered Person must allow Hardie or Hardie's authorized agent to enter the property and structure where the Product is installed, if applicable, and examine, photograph and take samples of the Product.
4. WHAT IS NOT COVERED:
This Limited Warranty does not cover damage or defects resulting from or in any way attributable to:
- The improper storage, shipping, handling or installation of the Product (including, without limitation, failure of the Product to be installed in strict compliance with the Conditions of Limited Warranty set forth in Section 3.B of this Limited Warranty) and/or improper installation of studs or other accessories;
- Further processing, modification or alteration of the Product after shipping from Hardie;
- Neglect, abuse, or misuse;
- Repair or alteration;
- Settlement or structural movement and/or movement of materials to which the
Product is attached;
- Damage from incorrect design of the structure;
- Exceeding the maximum floor deflection;
- Exceeding the maximum designed wind loads;
- Acts of God including, but not limited to, tornados, hurricanes, floods, earthquakes, severe weather or other natural phenomena, (including, but not limited to, unusual climate conditions);
- Efflorescence or performance of any paints and/or coatings which are not
Hardie and/or Hardie affiliated applied;
- Lack of proper maintenance; or
- Any cause other than material or manufacturing defects attributable to Hardie
5. LIMITATION OF LIABILITY:
IN NO EVENT SHALL HARDIE BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING BUT NOT LIMITED TO, ANY CLAIMS OF PROPERTY DAMAGE, BASED UPON BREACH OF WARRANTY, BREACH OF CONTRACT, TORT, OR ANY OTHER LEGAL THEORY. Some states do not allow the exclusion or
limitation of incidental or consequential damages, so the above limitation may not apply to you.
6. ENTIRE AGREEMENT:
This Limited Warranty contains and represents the only warranty extended by Hardie for the Product. No employee or agent of Hardie or any other party is authorized to make any other warranty in addition to those made in this Limited Warranty. This Limited Warranty gives you specific legal rights and you may also have other rights which vary from state to state.
7. HOW TO OBTAIN WARRANTY SERVICE:
For warranty services call 1.866.375.8603 or write Warranty Department, James Hardie Building Products, Inc., 10901 Elm Avenue, Fontana, California 92337.
HardieBacker® 1/4'' Cement Board, with EZ Grid® FAQ
A: Use the online James Hardie preferred dealer locator or call customer service at 1-888-JHARDIE for your closest sales representative.
A: HardieBacker board may be cut with a carbide-tipped scoring knife, utility knife, or cutting shears (manual, electric or pneumatic).
A: Home Depot® stores and Lowe's Home Improvement Warehouses®.
A: Either is acceptable, but we recommend that the smooth side with the nailing pattern of every 8" on center go up.
A: The minimum subfloor specified is 5/8" exterior grade plywood or 23/32'' exterior grade OSB subflooring. HardieBacker board must be installed in accordance with local building codes and the floor must be engineered not to exceed the L/360 deflection criteria, including live and dead design loads, for the specific joist spacing used. HardieBacker board is not designed for use over concrete.
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A: Dry set (ANSI 118.1) or acrylic modified thinset (ANSI 118.4) is specified between the HardieBacker board and the subfloor to eliminate any deviations between our product and the subfloor. This decreases the probability of popping or cracking tiles due to deflection and air pockets.
A: The modified thinset used with our product is a fortified cement-based mortar and should specifically conform to ANSI (American National Standards Institute) A 118.4. The thinset can be fortified in a pre-mixed powder form or with a liquid additive.
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A: No. Where HardieBacker board is being installed over a code-complying subfloor for the attachment of tile, the board is installed over a 3/32''-1/4'' thick bed of bonding mortar and then nailed down. ''Liquid Nails'' is not a bonding mortar. It is a structural adhesive generally used to bond the subfloor to the floor joists just prior to nailing. It creates a very solid joint between the surface of the floor joist and the subfloor and aids in reducing floor squeak. The properties of Liquid Nails are such that it is applied via a tube in the form of a bead-like caulking. It is not trowelable like a mortar and therefore results in high ridges with unsupported areas that can deflect under load, resulting in cracked tile.
Where HardieBacker board is being installed directly to wood or metal framing, the use of a structural adhesive in addition to mechanical fastening can be used. However, the board must be forced into the structural adhesive almost immediately upon application to insure that no ridge or crown is formed. The creation of a crown or ridge will result in an additional thickness of mortar being applied to fill in the valley created by the crown. This will require a longer curing time and result in a weaker bond between the tile and the mortar and the underlayment. The use of a structural adhesive does not result in fewer fasteners being required.
A: Fasten HardieBacker sheets with proper nails or screws (as listed in ''Materials Required'' in the backer installation instructions) every 8'' around the perimeter and all supporting studs. Keep fasteners between 3/8'' and 3/4'' from sheet edges and 2'' in from sheet corners.
A: In compliance with the tile industry, James Hardie recommends 1-1/4'' long galvanized or stainless steel roofing nails (0.121'' shank x 3/8'' HD) or 1-1/4'' long corrosion resistant ribbed waferhead screws (No. 8-18 x 3/8'' HD).
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A: The screws that you are using do not have the power to rout out the material in order for the screw head to sit flush. Be sure to use the specified screws (1-1/4'' No.8-18 by 3/8'' HD Hi-Lo S or S-12 for metal studs, ribbed phil wafer head, self drilling, corrosion-resistant screws). If you continue to have difficulties, we recommend switching to 1-1/4'' galvanized roofing nails
A: The tape will help disperse any movement of the substrate, therefore decreasing the probability of popping or cracking tiles along the seams.
A: Home Depot stores and Lowe's Home Improvement Warehouses.
A: Yes, Hardiebacker can go over linoleum or vinyl composite tile. Even though you may go over vinyl composite tile, James Hardie does not recommend you install HardieBacker board over cushioned vinyl. Follow HardieBacker floor installation instructions for complete details.
A: Yes, HardieBacker 1/4'' cement board may be used in a shower. However, we recommend HardieBacker 500 if you need to make a smooth transition to drywall. The board must be mechanically fastened every 8'' on center to the wood or metal studs spaced a maximum of 16'' on center. A vapor barrier is needed if required by local building codes.
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A: Yes, both HardieBacker 500 and 1/4'' board may be used for floor tile applications. If additional height is not required for transition, consider HardieBacker 1/4'' board — which has more compressive and flexural strength than any board on the market — even when compared to 1/2'' glass mesh cement boards. HardieBacker 1/4'' 3'x5' EZ Grid® sheet comes with a recessed fastener pattern for even easier installation.
A: Yes, HardieBacker board can be used as a fireplace facing. HardieBacker 1/4'' board can be used as a component in a 1-hour fire resistive construction when installed in compliance with National Evaluation Report NER-405. HardieBacker boards are recognized as non-combustible, when tested according to ASTM E 136.
A: In accordance with National Evaluation Service Report NER-405, HardieBacker board is recognized only as an interior substrate.
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