grouting over grout [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile


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03-07-2007, 04:46 PM
We have a black ceramic tile floor with very dark gray grout. The grout had gotten dirty and turned whitish before I had a chance to seal it. I am going to try to clean the grout and then seal it, but if I'm not successful at cleaning it, Could someone please tell me what I need to do to put a new, thin layer of grout over the current grout, so that the new grout sticks to the old grout, and covers up the stained grout underneath?


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03-07-2007, 05:01 PM
You will have to dig out most of the old grout to get the new stuff to stick. You cant just apply a new layer, it wont stick.

03-07-2007, 05:04 PM
Hi Jeff,

If you intend to put in new grout, you're going to have to remove at least half - preferably 2/3rds - of the existing grout. Any less and you just can't count on the new grout sticking to the old.

What is that tile set upon? I wonder if you have an efflorescence problem.

Here's a link on the subject:

03-07-2007, 11:14 PM
How about going over it with a grout stain/sealer? Kill two birds with one stone.