Drywall can suffice as a base for glass tile in some applications like a kitchen backsplash, as long as you apply a waterproof membrane before the mortar. However, drywall substrates are not intended for areas with a lot of moisture, such as showers. Proper installation of glass tile requires more attention to detail than installing ceramic tile. Careful planning is even more crucial with large-format glass tiles on drywall. But the finished work of art is well worth the required extra effort.
Instructions
1. Clean the back of your glass tiles with a dry cloth to remove any debris or moisture. Set the glass tile aside.
2. Apply the mortar to the drywall substrate with a square notch trowel. Cover the edges of the drywall with the mortar. Smooth away the ridges left from your trowel, and finish with a thin, consistent bond coat of 1/8 inch.
3. Apply the mortar with your square notch trowel to the entire back of a glass tile. Smooth away the ridges left from the trowel.
4. Place the glass tile onto the mortar-covered drywall. Apply the tiles to the bed of mortar with firm even pressure. Tap the tile into place with a beating block or grout float. Repeat with all your tiles.
5. Let cure for 48 to 72 hours.
6. Clean the surface of your tiles thoroughly before and during the grouting process.
7. Mix the grout according to manufacturer's instructions and apply it between all tiles, wiping it off the tiles with a soft cloth.
8. Let the grout set for 24 hours.
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