How to Remove Grout From Bathroom Tiles

Grout, a substance similar to mortar used for filling joints between bathroom tiles, grows mold and deteriorates more quickly than the glazed, sealed surfaces of the tiles. Typically 1/16- to 1/4-inch thick, grout joints keep tiles from shifting and help create a water-repelling surface in showers and around sinks and other bathroom fixtures. The average homeowner can grind away old, discolored or crumbling grout, while keeping the tiles in place, before applying new grout into the open seams. 1 Cover the floor and bathroom fixtures with a drop cloth to protect them from damage. Removing old grout seams can be a messy and dusty job. Wear a dust mask and eye protection. 2 Run the grout saw’s abrasive blade back and forth along the joints between tiles. For best results, grind out a groove in the joint measuring a minimum of 1/8-inch deep to provide an adequate base for the new grout to adhere. 3 Vacuum up dust and small pieces of grout frequently to ensure you can properly see the grout joints and work more accurately. 4 Consider using a power tool for larger projects. An electric rotary tool with a special grout-removing attachment quickly grinds through grout. Choose an attachment with adjustable guides that align along the old grout joints to keep you on track as you work. 5 Attach the grout-grinding bit to the rotary tool and set the bit depth at 1/8 to 1/4 inch, depending on the size of your joints. Run the tool between the tiles, grinding out a groove from the old grout. Inspect each joint and scrape away any small pieces of grout with the grout saw. 6 Brush and vacuum away grout dust between the tiles and clean the open joints with a damp towel or rag. Allow the joints to dry before applying new grout. Things You Will Need Drop cloths Safety glasses Dust mask Grout saw Rotary tool with carbide grout-removal attachment Shop vacuum Clean towels or rags Tip Work carefully and take care not to chip the tile when using an electric rotary tool. To remove just a few seams of grout, you can use a flat-head screwdriver and a hammer to chisel out the old grout. However, this method is not very accurate and the likelihood of the screwdriver slipping and chipping the tile is high. Warning Inspect bathroom tiles and grout joints carefully before you begin removing grout. If any grout joints appear cracked there is a good chance that water seeped through to the backer board supporting the tiles. You may need to remove the tiles and replace the backer board, ensuring the underlying structure remains undamaged, before re-tiling.