The tile contractor didn't do a good job while setting the tiles in my
kitchen; in some locations the grout doesn't fill the joints properly -
it's too low. (I know it should be slightly lower than the tiles, but
in these cases it's too much).
I would like to regrout the floor to fix the problem. Is it OK to do
this over the existing grout (was set couple of months ago)? Is it
going to stick to it? These are polished porcelain tiles, and grout is
less than 1/8" thick.
In my (limited) experience with grouting, you shouldn't put new grout
over old grout completely. I believe I read on one of the grout boxes
that if you're re-grouting, atleast 3 mm of grout need to be cut out
first. To cut out some of the old grout, you can use a rotary tool or
get a grout saw at the hardware store.
Never add new grout over old grout. It will not stick.
You must remove some of the old grout, the more the better. Try and
remove atleast 1/8" to ensure a good sized crevice to fill.
Do you mean the grout is 1/8" _wide_? And how deep are
the bad areas? How much of the job (percentage wise) is not
filled properly? 10%? 50%?
Are there parts of the job where the grout has filled the joints
completely, or is it all basically 'washed out'?
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