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Old 05-13-2019, 08:15 PM   #16
benualson
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I also see we missed your last question about the installation of the subfloor. How was that installed?
Installed the 3/4 t&g adventech over the 1/2 5ply perpendicular to 16 OC joists. Screwed it to joists per manufacturer specs. Span of joists in this area is 14'

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Old 05-13-2019, 08:17 PM   #17
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Welcome back, Ben.



Is this the same project as this one?



Can you tell us what mortar was used, both in the installation of the Ditra underlayment and the tile?



Also, if you know, what size trowel was used for both of those applications?



What size tile?



Heat can accelerate the drying process, often to a poor outcome. Was there sunlight directly on any of the floor during the installation? Were fans running in the area?
Oofda. I don't know exactly. I suppose I'll need to gather that before you can make a proper assessment. I remember seeing gray ditra set bags.

No fans. No direct sunlight. 12x24 tile. One room was small hex and one of those is loose. I noticed they didn't do the whole room at once. I think some of the ditra cavities were filled and dried before the actually worked that area.

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Old 05-13-2019, 08:28 PM   #18
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That would be fine for installing tile to Ditra, but not for installing Ditra on the subfloor, unless there was an additive mixed in with it.
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Old 05-18-2019, 11:26 PM   #19
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Comes up easy.

Loose tile job https://imgur.com/gallery/UISV0se

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Old 05-19-2019, 01:08 AM   #20
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There just wasn't enough contact between the mortar and tile for it to stick, at least in the first two pictures. Also, the larger tiles should have been back buttered for better adhesion.

The third looks like it may have bonded well. Was it more difficult to remove?

By the way, you can upload those pictures to the post using the paper clip icon in the reply box.
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Old 05-19-2019, 05:52 AM   #21
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Third was easy to remove. But it was bonded better. It actually pulled the ditra up so the ditra is now separated and loose. I wonder if the problem there was bad ditra bond? I've decided to pull it all up and start over. Before I dug in I found over a dozen tiles with movement among those 3 rooms.

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Old 05-19-2019, 01:09 PM   #22
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No bond https://imgur.com/gallery/OaOZacf

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Old 05-19-2019, 03:06 PM   #23
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Advantech was mentioned earlier, was that ever installed? I always thought it had a waterproof coating over it that was hard to stick to.

Also, you mentioned 2 inch hex. Best I remember, Schluter says 2 inch tiles are the smallest recommended for tiling over Ditra. It could be that the Ditra is collapsing in those areas, especially if the waffles weren't full. Are those problems in the main traffic areas?
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Old 05-19-2019, 03:16 PM   #24
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Adventech yes. That makes sense it is very water resistant.

Adventech has instructions for tile and it doesn't say anything special for uncoupling membrane besides follow manufacturer instructions.

Yes, high traffic areas.

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Old 05-20-2019, 12:24 PM   #25
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Is ditra supposed to pull away from the subfloor with almost no effort?

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Old 05-20-2019, 01:11 PM   #26
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Not if it's been properly installed and been there for a week or more.
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Old 05-20-2019, 01:17 PM   #27
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Not if it's been properly installed and been there for a week or more.
Ok thanks. I was able to remove tile in full peices and then the ditra pulled right up with almost no resistance. Demoed the small laundry room in less than an hour with prybar. Two hours to demo the 2x2 hex room. Some of those hex came off easily in full 12"x12" sheets (those 2x2 hex were in netting sheets).

I took a lot of pictures. Called schluter and they directed me to local schluter reps. I'll let you know how this all shakes out. I have other rooms I haven't demoed yet. Schluter will probably want to see it in person.

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