Is it possible to grout over existing grout?


It is necessary to remove existing grout before adding new grout between tiles according to Bob Villa of "This Old House." An existing tiled surface that needs fresh grout between the tiles will require some work.

The reason it is important to remove the existing grout is because grout does not adhere well to existing grout. Placing a fresh layer of grout over an old layer will eventually cause the new grout to flake off away from the surface. The layers of grout will remain separate from each other, which will cause the newest layer of grout to fail.

To prepare the surface for new grout, remove the original grout to at least two-thirds of the tile depth.

Q&A Related to "Is it possible to grout over existing grout?"
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The answer is the old grout will have to be removed according to experts such as.….
On antiqued finished the minimum is 1/8" grout line. On the honed you might be able to get a 1/16" grout line depending on the edging.
Use a special oil-based grout stain to change the existing
1 Additional Answer Answer for: can you grout over existing grout
Can I Grout Over Existing Grout?
When the grout in your home begins to discolor, crack and crumble, the time has come to re-grout your tile. Grout serves the function of not only holding tile in place, but also of protecting the surface beneath from water damage. Unfortunately, you... More »
Difficulty: Easy
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