Repairing Crumbling Grout

Grout is the cement material that sits between the tiles on your floor or wall. It links the tiles together and forms one flat surface out of those separate squares. If the grout starts to crumble and crack, it can allow moisture to get under the tiles, which can cause further damage. It's important to repair crumbling grout as soon as possible. The old grout has to come out in all the areas where it's crumbling before you can add the new grout in its place.

Grout saw (straight carbide blade on a handle)
Premixed grout
Vacuum hose
Wide putty knife
Grout float (flat rubber trowel)
Sponge

Instructions

- 1
  Dig out the damaged grout from between the tiles using your grout saw. Use it by scraping the straight edge of the saw against the crumbled grout, forward and back, breaking down into the surface. Get out all the loose grout.
- 2
  Vacuum out the lines of all the pulverized grout. Rinse well with clean water. Allow tiles to dry.
- 3
  Open your premixed grout. Stir it well with your putty knife.
- 4
  Scoop out a trowel-full of grout with your grout float. Spread it along the first grout line, using the long edge of the float to scrape diagonally over the line, squeezing the grout off the tile surface while smoothing it into the lines. Repeat and continue for all the lines where you extracted the grout.
- 5
  Let the grout set it the lines for 10 minutes. Wipe up the excess grout from the tile surface with damp sponge, running the sponge flat over the surface so it doesn’t dig out the grout. Let the grout set for 24 hours.

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