HardieBacker cement board is a tile backer substrate designed for use in wall, floor, and countertop applications. It is composed of 90% premium Portland cement and sand and incorporates MoldBlock® Technology for moisture and mold resistance. Installation requires specific materials and techniques to ensure a durable and long-lasting result. The product is backed by a limited lifetime warranty.
Understanding HardieBacker Cement Board
HardieBacker cement board serves as an underlayment for tile or stone installations, particularly in areas prone to moisture, such as kitchens and bathrooms. Its primary function is to protect against water damage and provide a stable substrate for tile adhesion. The board’s formulation and MoldBlock® Technology contribute to its resistance to mold and moisture, potentially reducing the need for future product replacement. James Hardie demonstrates a commitment to reducing energy consumption and improving waste management in its manufacturing processes.
Installation Preparation and Layout
Proper layout is crucial for a successful HardieBacker installation. Boards should be installed with the smooth side facing upwards. Perpendicular installation to subfloor panels is recommended, and all board joints must be staggered. Aligning HardieBacker board joints with subfloor joints should be avoided. It is also important to prevent all four corners of boards from meeting at a single point. The boards should be lightly butted together; gaps should not be left, nor should edges be forced together. Factory-cut edges should be joined within the body of the floor.
Required Materials and Tools
Successful installation of HardieBacker cement board requires specific materials. These include:
- Modified dry-set cement mortar (also known as latex or acrylic modified thinset)
- 2” wide, high-strength, alkali-resistant glass fiber tape
- Corrosion-resistant roofing nails OR 1.25” minimum Backer-On screws
- Appropriately sized notched trowel (based on the tile size)
- Carbide-tipped scoring knife (recommended), utility knife, or shears
The selection of the correct notched trowel size is dependent on the size of the tile being installed.
Cutting and Shaping HardieBacker Board
Cutting HardieBacker board requires specific techniques and tools. A straight edge should be used as a guide to score the board’s face. The board can then be snapped upward along the score line. A carbide-tipped scoring knife is recommended, although a utility knife may also be used. Shears, both manual, electric, and pneumatic, are also acceptable for cutting. For cutouts and small holes, the perimeter should be scored, and the material broken out from the face side using a hammer. High-speed power tools, such as saws and grinders, should not be used.
Environmental Considerations
The proprietary cement formulation and MoldBlock® Technology incorporated into HardieBacker board contribute to its moisture and mold resistance. This durability reduces the likelihood of product replacement over time. James Hardie emphasizes its commitment to environmental responsibility through energy consumption reduction, process efficiency improvements, and effective waste management practices.
Sources
- James Hardie Installation Instructions & Technical Docs
- HardieBacker Installation Guide
- How to Install Hardie Backer Cement Board on Walls
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