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Old 01-22-2013, 08:18 AM   #1
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To fill or not to fill ( waffles )

How many of you guys prefill or not prefill your DITRA waffles?

Trying to get a count either way.

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Old 01-22-2013, 08:38 AM   #2
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If I am NOT setting the tile that day ( do to time ) I will use up my modified thin set and fill the waffles - allow to dry. Key-in the next day and set as normal with non-modified.

I did a test with Ditra and other substrates about back-buttering tile. The thing that surprised me when I pulled up the tiles from the Ditra is that ALL the thin set came out of the waffles with either tile. Back-buttered or not.
I doubt if by filling the waffles first or just doing it when you set would change this.

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Old 01-22-2013, 08:40 AM   #3
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I don't prefill. I set my tile with a cheap laser and I can see it just fine on the Ditra. At the end of the day I will fill waffles to keep from wasting any thinset (whatever I have left that wont set a tile).

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Old 01-22-2013, 08:48 AM   #4
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Almost only prefill
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Old 01-22-2013, 08:54 AM   #5
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Depends on my mood that day. I'd say I'm about 50/50
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Old 01-22-2013, 10:09 AM   #6
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Never, dont see a reason for it. Most of the time i use straightedges to set, and always makes a additional mess to vaccuum up, Thats one of the benefits of ditra, a nice clean surface. I will though, throw leftover thinset in a closet at the end of the day.
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Old 01-22-2013, 10:20 AM   #7
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If I have a chance to give the ditra a day to set up and pre fill the waffles I will.

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Old 01-22-2013, 12:35 PM   #8
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Old 01-22-2013, 02:11 PM   #9
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i had pre filled the waffles on a recent job..i let it sit over nigh for 14 hours..then started to tile..it seemed very dry but i still dont now about prefilling the waffles unless u give the 48 hours to full cure and then set tile..i keep debating on this

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Old 01-22-2013, 02:25 PM   #10
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Un filled waffles do not hold up well to wheelchairs, fridges, or carts loaded with tile.

Just thought I'd throw that out there.

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Old 01-22-2013, 03:47 PM   #11
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Not to thread jack but I demoed 200 ft of tile and ditra yesterday when the tile came off the ditra the thinset pulled from the waffles with it and crumbed out of the waffles, I expected it to lock into the waffles better then it did, the ditra tearout was simple too, easier then I thought, anyways I do not prefill.

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Old 01-22-2013, 04:04 PM   #12
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Prefill if the timing is right.. and I use Versabond to set the tile... I know...

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Old 01-22-2013, 04:26 PM   #13
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prefill kina guy
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Old 01-22-2013, 04:54 PM   #14
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if I'm doing a small bathroom or something under 150-150 sq.ft. I wont fill.
because I can set the Ditra and set the tile in 1 day.

if I'm doing a big job (200 + sq.ft.) I prefer to pre fill. I can float the waffle in way faster then trying to push thinset around while setting.
snapping lines is so much better and less thinset i'm moving when setting the tile.
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Old 01-22-2013, 05:57 PM   #15
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Originally Posted by Derrick
I expected it to lock into the waffles better then it did, the ditra tearout was simple too, easier then I thought,
A Ditra installation only has to achieve 50 psi shear bond. Just about any thin-set will do that. It doesn't matter that it comes up easy.
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