How To Regrout Behind a Backsplash


If the grout between tiles starts cracking and crumbling, it looks bad and can lead to further damage. This is especially an issue for the grout on a tiled backsplash, because moisture from the sink can get in through those damaged grout lines, making the wall behind it soft and causing the tile itself to start coming off. Mold problems could also develop in the wall. Re-grouting should be done as soon as you notice problems. Sealing the new grout with a tile sealant will ensure you aren't having to do the project again in a six months.

Things You'll Need

  • Grout saw (carbide blade on a handle)
  • Vacuum hose
  • Grout mix
  • Bucket
  • Wide putty knife
  • Grout float (flat rubber trowel)
  • Sponge
  • Tile sealant
  • Small brush
  • Dig out the old grout using your grout saw. Scrape the saw forward and back over each grout line until it breaks down under the surface; then continue scraping until it's mostly gone. Take care not to damage the tiles.

  • Vacuum the debris out of the grout lines, using the hose from your vacuum cleaner.

  • Mix your grout and water in a bucket. Ratios of grout mix to water vary (see the grout packaging), but generally you want to get it to a consistency like cake frosting. Let it sit in the bucket for 10 minutes after the initial mixing, and then re-stir.

  • Apply the grout over the backsplash using your grout float. Wipe the grout onto the tiles; then run the float over the surface at an angle, with the long edge of the float pressing firmly against the tile to squeeze it off the face and press it into the lines. Let it sit for 5 or 10 minutes; then wipe off the excess grout with a damp sponge.

  • Let the grout cure for five to seven days. Seal the grout lines using a grout sealant applied with a small brush right over the lines.

Tips & Warnings

  • Wear a dust mask when mixing your grout.

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