How to Regrout Bathroom Tile

Grout is the unsung hero of your bathroom, serving as the essential barrier between your tile and the moisture-prone subfloor. Over time, constant exposure to water and cleaning agents causes grout to crack, stain, or crumble, creating pathways for mold and water damage. Letting this persist leads to far more expensive repairs than just replacing the line of cement between your tiles. Doing this well means prioritizing the removal process. If you do not clear out the old material, the new grout will not have a deep enough bed to bond, leading to premature flaking. A clean, debris-free channel is the difference between a project that lasts five years and one that fails in five months.

1. Scrape Out Old Grout. Use a carbide-tipped grout saw to scrape out the old grout to a depth of at least 1/8 inch. Work slowly to avoid chipping the edges of the ceramic or stone tiles.
2. Clear Dust and Kill Mold. Use a shop vacuum to pull every bit of loose dust from the joints. Wipe the area down with a mixture of water and vinegar to kill any residual mold spores.
3. Achieve Perfect Grout Consistency. Follow the manufacturer's ratio for mixing powder to water in a small bucket. Aim for a consistency similar to smooth peanut butter, ensuring there are no dry lumps.
4. Pack Joints at Forty-Five. Hold a grout float at a 45-degree angle to the tile surface. Force the grout deep into the joints using firm, sweeping diagonal strokes.
5. Wipe Without Washing Out. Wait about 15-20 minutes for the grout to haze over, then use a damp—not wet—large grout sponge to wipe away the excess. Rinse the sponge frequently and wring it out until it is barely moist.
6. Lock in Protection Forever. After the grout has fully cured per the package instructions, typically 24-48 hours, apply a penetrating grout sealer. This prevents future staining and water intrusion.