Measure the dimensions on the ceiling. Multiply the length of the room by the width to attain the area of the ceiling.
Purchase as many tiles as you will need to cover the area. Purchase 10 percent more than you'll need to account for potential damage to the tiles during shipping or installation.
Use the chalk line to snap a line that is perpendicular to one edge, using the T-square as a guide.
Mix the thinset mortar according to the instructions on the package.
Use the notched trowel to spread a 1/4-inch layer of thinset over the space of several tiles. The spaces the notched trowel creates between the mortar are important to the tiles adhering properly to the ceiling and staying there.
Using the chalk line as a guide, press the first tile into the mortar. Use firm pressure and a slight wiggle to push any air bubbles out of the spaces in the mortar and assure the tile adheres properly.
Add spacers to all sides of the tile.
Continue spreading mortar and setting the tiles until you finish one row.
Use a wet-saw to cut to size any tiles that may not fit at the end of the row.
Continue laying the tiles in rows until the ceiling is covered. Use a tile scribe and tile nippers to cut out spaces in the tiles for ceiling fixtures. Use a wet-saw to cut to size the last row of tiles to ensure they are flush with the wall.
Allow the mortar to cure overnight.
Mix the grout according to the instructions on the package.
Use the rubber trowel to spread the grout into the spaces between the tiles. Use a damp cloth to wipe away any excess grout from the tiles.