Glass Tile101: Setting Tile

Glass tile is a beautiful and amazing product that can easily be installed by just about anyone who can wield a notched trowel. If you've ever installed tile before, then you can easily install glass tiles. Even if you've never installed tile before, using these basic instructions, you can create your own tile mosaic in your bathroom, kitchen or on your favorite arts and craft project. But before you start spreading out thinset and cutting tiles, first learn these basics of setting glass tiles.

Thinset

Using mortar mixed with sand and water has been used to install tile for thousands of years. A "thickset" is applied to the substrate and tiles are pressed into the mix then tapped or vibrated with a rubber mallet to remove air pockets.

This method of thicksetting tiles is rarely used due to the fact that glass tiles do not shrink with the mortar and can cause tiles to crack and break easily. Today's mortar mix is referred to as thinset. Thinset is literally a "thin" set of mortar mix that easier resists shrinking and tile breakage from occurring. With the addition of polymers, latex or acrylics, thinset will flex enough to prevent shrinkage and tile breaks.

A common tile adhesive known as mastics are filled with organic and latex. These adhesives should not be used with glass tiles. Organic mixtures will not disperse their moisture evenly into the substrates and glass tiles, creating a mold or mildew problem that is unacceptable. If you don't want future problems with your glass tile installation, always use a thinset mortar that the glass tile manufacturer recommends.

Applying the Thinset

A simple notched trowel that is typically used in tile sets can be used with glass tiles. Spread the thinset onto the substrate with the notched side of the trowel to "comb" the thinset into position. Never overstock or pile up more thinset more than the notch allows.

Thinset sets up in about 15-20 minutes after application and much faster when temperatures are hot. Always apply thinset in sections you are comfortable working with. Tiles must be set before the thinset sets up; otherwise the tile will not bond to the mortar.

Back buttering glass tiles-especially translucent tiles-is necessary to prevent bubbles, notch marks or other imperfections to be visible through the front of the tile. Use the smooth side of the trowel to spread thinset onto the back of each tile before setting them in place. A light tamping with a rubber mallet will secure the glass tile in place and help remove any bubbles.