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Old 11-15-2008, 03:20 PM   #1
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silicone caulking over ceramic tile grout joints


Hi

A contractor applied silicone caulk to all the grout joints on my new ceramic tile floor. He did this to prevent the grout crumbling in certain areas.
The caulk he used left a shinny bead of silicone over the grout. In addition the silicone is peeling off. To say the least it doesn't look good.
Is what he did an accepted practice used by others?
If it is could he have used the wrong type of silicone? Are there other ways the problem of crumbing grout be resolved short of complete regrouting as that has already been done once. Oh, he also said he applied a sealer of some kind. I have a feeling that crumbling may be the result of floor movement due to poor joining of an addition. The crumbling is in that area.
Botton line is that i'm hoping to resolve the problem while looking OK without starting over.
Any help would be greatly appreciated.
Thank, Tony

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Old 11-15-2008, 03:28 PM   #2
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silicone caulking over ceramic tile grout joints


Quote:
Is what he did an accepted practice used by others?
Not that i ever heard of- wierd but interesting-

Quote:
If it is could he have used the wrong type of silicone?
I think it is because he used it....period...

Quote:
I have a feeling that crumbling may be the result of floor movement due to poor joining of an addition.
I am positive it is because of movement.

Quote:
Are there other ways the problem of crumbing grout be resolved short of complete regrouting as that has already been done once.
Regrout again...this time use flexible grout.
That should do it..

unless others chime in with a better idea...

good luck!

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Old 11-15-2008, 03:51 PM   #3
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silicone caulking over ceramic tile grout joints


silicone caulk is useful stuff—it can be used to decorate or repair and, at the same time, it seals and protects. I just wonder whether they used pure silicone chaulk or not.

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Old 11-15-2008, 11:36 PM   #4
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silicone caulking over ceramic tile grout joints


Uh... I'll take the FlorCrafts response for 1 billion Alex!!! I would never reccomend that. It seems to me that over time (short time) all that silicone would start to peal up! It is time for what they call a "call back".
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Old 11-16-2008, 07:42 AM   #5
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silicone caulking over ceramic tile grout joints


grout doesn't crumble if the sub-floor's stable, it was mixed properly, & installed correctly,,, silicone's useful on joints that experience movement but it does NOT like 3-sided adhesion NOR is it designed for that.
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Old 11-16-2008, 09:48 AM   #6
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silicone caulking over ceramic tile grout joints


Plan not to use the shower (or tub) for at least three days. Grout and caulk need 48 hours to cure before you can apply a grout sealant, which takes at least another full day. When you're ready to work, place tape over the drain to keep out debris. Place a canvas drop cloth over the floor of the tub or shower to protect the surface from the sand-like grout that can scratch it. Just before you're ready to grout, mix an appropriate amount by adding water slowly to the powder until the right consistency is reached. Grout should be just stiff enough so it won't pour out of a container. Then let it rest for about 10 minutes.

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