crumbling grout in between porcelain floor tiles


Old 02-22-04, 07:33 PM
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crumbling grout in between porcelain floor tiles

We recently remodeled our kitchen and installed tile. Backer board was put down with screws and the tile laid over that.
The problem we are experiencing is a couple places where the grout is crumbling. What would have caused this, and how is the best way to repair so it won't happen again? The sanded grout was mixed with water only. Thanks
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Old 02-24-04, 12:06 PM
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Hello & welcome aboard!

This situation could be caused by a couple of things, could be as simple as the grout was mixed too loose, it should be about the consistency of peanutbutter. Could also be that you got a bad bag or maybe an outdated product. Or could be the grout had dried out too much when it was applied in those spots, hard to say really.

Post back & tell us what brand & type of grout was used & the consistency of the mix when it was applied. Also has the gout been sealed yet?

I've read some stuff about rehydrating grout, where you flood the grout with water & let it set overnight, never tried it myself, but apparently others have had some success with it.

IMO, your best option would be to dig the crumbling areas out & regout them, but post back with the requested info first, don't want to have to fix this but once, right!
Old 02-24-04, 07:37 PM
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what probably has happened is that you have gotten air bubbles in your grout probably from mixing it to thin or if the joints where not cleaned well......if your worried about you backerboard causing this if you screwed it done well and spread thinset underneath it should be ok
Old 02-24-04, 07:40 PM
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Breaking grout is a sign of floor movenent.

What is the joist size, span and spacing?

Did you use thinset under the backer board?
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