Installation Guide
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ENVIRONMENTAL CONSIDERATIONS
HardieBacker
®
board’s proprietary cement formulation and MoldBlock
®
Technology
provide a moisture and mold-resistant wallboard and tile backer substrate that
stands tough over time, reducing the need for product replacement. James Hardie
has demonstrated a commitment to reducing energy consumption, while improving
process efciencies and waste management. It avoids the use of environmentally
damaging materials and uses renewable resources that are abundant in the
manufacture of HardieBacker
®
cement board. HardieBacker cement board does
not contain any glass bers, gypsum, asbestos or formaldehyde. The company also
focuses on water conservation and attempts to recycle water and waste product as
much as possible during the manufacturing process.
RECOGNITIONS
HardieBacker cement board is recognized as an interior substrate by the following:
• International Code Council Evaluation Service ESR-2280
• City of Los Angeles Research Report No. 24862
• HUD Materials Release Nos. 1263 and 1268
• City of New York MEA No. 223-93M
• IBC 2509.2
• IRC R702.4.2
Consult these documents for additional information concerning conditions for use in
applicable jurisdictions.
*Cementitious Backer Unit/Fiber-Cement Underlayment
Compressive Strength Compressive Strength at Equilibrium Moisture Content (ASTM
D2394)
1/4” HardieBacker
®
EZ Grid
®
cement board: 7000 psi (48 MPa)
HardieBacker
®
500 cement board: 6500 psi (45 MPa)
Non-Combustibility HardieBacker cement board is recognized as non-combustible in
accordance with ASTM E136.
Surface Burning Characteristics When tested in accordance with ASTM method E-84:
Flame Spread – 0, Fuel Contributed – 0, Smoke Developed – 5.
Fire Rated Assemblies HardieBacker cement board may be used as a component
in one-hour re-resistive wall construction; consult ESR-2280 website listings
for recognized assemblies, or contact James Hardie’s Technical Services at
1-800-9HARDIE (1-800-942-7343).
INTERIOR WARRANTY
Warranty copies are available from James Hardie Building Products or wherever
James Hardie
®
products are sold. Limited lifetime warranty includes material and
labor. Please visit HardieBacker.com for more details.
EXTERIOR WARRANTY
Warranty coverage for this application is limited to HZ10 areas only. To nd out
your zone go to HardieZone.com or see HardieBacker
®
cement board’s exterior
application warranty for applicable zip codes. The HardieBacker
®
500 cement
board warranty is extended to cover external use, meaning areas under direct and
indirect exposure to weather.