Natalija decided to test some materials and methods by putting our street number on the loading dock of the warehouse. Her method was to lay 3/4-inch vitreous tile in a mounting grid, but she put them in upside down and laid a sheet of fiberglass mesh on them and used one drop of silicone adhesive on each tile to attach the mesh. My method would be to lay the tiles in the grid right side up and pick up the design with mosaic mounting tape.
Artist Jill Gatwood uses the following method to make water-resistant foam-core mosaic backers for exterior mosaics, such as the Pet Memorial Name Plaques she does for clients who need something that is lighter weight and easier to ship than stone or solid concrete. The method wraps the foam in three or four successive layers of fiberglass mesh and thinset mortar, and that coating is pretty tough, tougher than stone. (The combination of polymer-modified cement and fiberglass can withstand blows that would easily crack granite of the same thickness.)