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Grout lines should typically be between 1/8 to 3/16 inch thick. This ensures enough room for the grout to dry properly and makes them wide enough to look clean and professional. If grout lines are too small, it can be easier to see imperfections in the spacing. 

The best trowel for penny tile is a 3/16-inch-by-5/32-inch V-notch trowel. Because of the small size of the penny tile, you want a trowel with small notches that can lay a thin layer of mortar on the surface you’re tiling. If the notches are too wide, you risk applying too thick of a layer of mortar, and it can squeeze out between the penny tiles.

A cement backer board is not needed for laying tile on concrete. Sometimes referred to as a cementitious backer unit, or CBU, backer board should be used if the subfloor is plywood or OSB. The backer board provides a base on which to install the tiles that isn’t as likely to be damaged by any accidental water seepage as natural materials would be.

If you’re handling your tile removal yourself, seal the room using painter’s tape and heavy-duty contractor bags to prevent dust and shards from escaping. Use a claw hammer or a pry bar and a mallet to get behind the tile and pry it away from the floor or wall. Once your tiles are all removed, sweep everything into contractor bags for disposal, being careful not to overfill them. Make sure you wear a dust mask, safety goggles, and work gloves to keep yourself safe from injury while you work.