Glass Tile Waterfall Bond Failure

Follow Manufacturer's Instructions

• According to "Tile Magazine," one of the primary reasons tiling projects fail is the installer's refusal to follow the manufacturer's directions. Manufacturers often specify exactly which waterproof backing, adhesive and grout to use with their products. In addition, they give tool recommendations and installation tips. Manufacturers are invested in ensuring their products are successful, so following their instructions generally results in well-bonded, long-lasting tiling project.

Waterproof Backing

• Tile installed in extremely wet environments, such as showers, pools and water features, requires waterproof backing. Tiling adhesives are not waterproof, so this backing protects the adhesive from moisture, ensuring it doesn't break down and result in bond failure. There are several types of waterproof backing, including adhesive sheets, concrete backer board and mortar-type backing applied with a trowel. Check with the manufacturer of your tile for waterproof backing suggestions.

Adhesive

• Glass tile has a nonporous surface and requires adhesive that's different from the type used for ceramic tile. According to "Tile Magazine," most general-use thin-sets are not capable of adhering to glass tile. Instead, it suggests using a liquid latex-fortified Portland cement mortar in conjunction with an epoxy grout. Epoxy grout dries with a nonporous, non-absorbent finish that matches the look of glass tile. In addition, it lasts longer than cement-based grout and will help glass tile maintain its bond.

Installation and Tools

• Use the proper tools for your tiling project. The wrong type of trowel spreads too little or too much adhesive, resulting in a poor bond. A 3/16-inch, V-notched trowel is appropriate for installing mosaic tiles, and a 3/16-inch, square-notched trowel works well for larger tiles. Back butter any tile larger than a mosaic tile to ensure proper adhesion. To back butter, use the straight edge of your trowel to spread a thin layer of adhesive on the back of each tile.