How to Seal Floor Tile and Grout

Floor tiles, and the grout (cement) between them, look deceptively impenetrable and moisture-proof, but in they're often not.

Tiles that aren't glazed or otherwise sealed at the factory can absorb moisture and grime if you don't seal them yourself, and grout is even more porous. Sealing tile and grout isn't difficult, but it has to be done in a specific order to prevent the grout from staining the tile and to ensure that the sealer doesn't cause the grout to come loose in the lines between the tiles.

Lay your tile, leaving spaces for the grout. Allow the tile to set in its adhesive for a day.

Apply tile sealer over the surface of the tiles with a brush. Spread it in a thin, even layer. Make sure not to get the sealer into the lines between the tiles, but just on the tile face. Let it dry for an hour.

Apply grout to the floor with a grout float, wiping it across the surface and pressing it into the lines. Run the long edge of the float tightly against the surface to force it completely into the spaces.

Let the grout it sit in the lines for a minute, then wipe it all down with a damp sponge to take up the excess grout, leaving it in the lines.

Let the grout set for 2 days. Reseal the whole floor, grout and all, using a brush. Let the sealer dry for an hour and then apply a second coat. Let the sealer cure for a day before using the floor.

Things You Will Need

  • Penetrating tile sealer
  • Brush
  • Grout
  • Grout float (rubber trowel)
  • Sponge

Warning

  • Ventilate the room when grouting and sealing.