Installation Guide

9 | English
BASIC COMPOSITION
90% Portland cement and sand with selected additives. Contains no asbestos,
formaldehyde, gypsum, paper facing, or abrasive aggregate.
HardieBacker
®
Cement Board with HydroDefense
™
Technology:
Sheet sizes: 3 ft. x 5 ft.
Thickness: 0.42 in.
Weight: 2.6 lb / sq. ft. (12.7 kg/m2)
MATERIALS REQUIRED
1 | Mortar
For floors:
• Tile Bonding Mortar – Modified Dry-set Cement Mortar complying with ANSI
A118.4.
• Bedding Mortar (for use as a supporting bed of mortar between the subfloor
and cement board only) – Dry-set Cement Mortar complying with ANSI
A118.1 or Modified Dry-set Cement Mortar complying with ANSI A118.4.
For countertops:
• Tile Bonding Mortar – Modified Dry-set Cement Mortar complying with ANSI
A118.4.
• Bedding Mortar (for use as a supporting bed of mortar between the subbase
and cement board only) – Dry-set Cement Mortar complying with ANSI
A118.1 or Modified Dry-set Cement Mortar complying with ANSI A118.4.
• For Exterior applications, follow stone and mortar manufacturer’s
recommendations.
For walls:
• Tile Bonding Mortar – Modified Dry-set Cement Mortar complying with ANSI
A118.4.
• Tile Bonding Adhesive – Type 1 Organic Adhesive (mastic) complying with
ANSI A136.1 (Not to be used in exterior applications or interior wet areas).
• For Exterior applications, follow stone and mortar manufacturer’s
recommendations.
2 | Tape
• Minimum 2 in. wide high-strength alkali-resistant glass fiber tape.
3 | Sealant
• Flexible mildew resistant 100% silicone sealant complying with ASTM
C920 (for stone - check with stone supplier for compatible sealant
recommendations).