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Unread 10-12-2011, 11:54 AM   #31
gooner59
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allen is there any flexing/ movement in the detra (orange matting we can see ??)
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Unread 10-12-2011, 11:55 AM   #32
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If i push down on the high edges they are flexible. But the low parts are down solid.
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Unread 10-12-2011, 12:02 PM   #33
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In your picture, there are a lot of empty cavities in the Ditra. Were these filled prior to setting the tile?

If your tile came up clean, then there's a good chance the thinset had dried too much before the tile was set. In my book, putting thinset directly on the back of every tile is a must (with rare exceptions). It's particularly important with porcelain tile. After combing thinset on the floor, use the flat side of the trowel to embed thinset in the pores of the back of the tile. This ensure maximum bond between the tile and setting bed.

And yes, there is white unmodified thinset, but I don't think that has anything to do with your problem. Again, I think the problem is the lack of bond between setting bed and tile. Tile can start coming loose the next day, next year, or next decade.
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Unread 10-12-2011, 12:06 PM   #34
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when you say low area's do you mean the bottom of the dimple's ?

just an observation the is no adhesive on the back's of the tile's !!
as they were laid in to the wet addy did you back butter the tile as they were laid or not ? ( this mean's to spread a thin layer of addy on the back )
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Unread 10-12-2011, 12:07 PM   #35
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Hey Kevin,

Yes the ditra dimples were full, i chipped them out after removing the tiles.

I definately made the error of not backbutter or back 'burning' considering i used porcelain.

How do you suggest i fix it?

I have a couple options i suppose. Remove the ditra and scrap the thinset down to subfloor then relay ditra and tile over top of that.

Or if i can take the thinset off the ditra fairly clean can i just reuse the existing ditra and backbutter the tiles down and hope i can manage to keep the lips minimal?
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Unread 10-12-2011, 12:09 PM   #36
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What Kevin said.

Allen, I've combined four of your other threads about this kitchen project here in hopes of finding some information about what thinset mortar was used and any other enlightening data was available. Found only hints about what you might be using, nothing about what was used.

You can maybe fill in that blank when you answer Kevin's questions?

[Edit]

You're a little too quick today.

It is acceptable to cut out sections of the Ditra and re-install, if you can do that successfully. I would not try to re-use the Ditra.

My opinion; worth price charged.
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Unread 10-12-2011, 12:11 PM   #37
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David,

Yes the "low areas" are the bottom of the dimples.

And i did not backbutter.. I knew that it wasn't "manditory" for ceramic. And in my ignorance i believed porcelain was the same.

I have now found out through research that it is very very important to backbutter porcelain.. unfortunately i did not. So what do you think the end result will be? fixing isolated areas, or should i just pull everything up and redo? Obviously i hope the answer won't be pulling everything up.
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Unread 10-12-2011, 12:21 PM   #38
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as above really allen , cut out the affected section (damage limitation if you can ) clean down to sub straight to make sure nothing wrong there then cut out new ditra as required and relay tile's (and back butter ) then hope nowhere else
de-laminate's mate!! hope this help's you fella
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Unread 10-12-2011, 12:26 PM   #39
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Thanks CX, David and Kevin.

I suppose i'll cut out the ditra and see where that takes me.

Hopefully it's an isolated situation!
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