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Unread 01-24-2021, 08:49 PM   #31
Dave_N
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Okay, good information guys. I'm glad I didn't install it tonight. Is there something that home depot sells that I could use? There's a HD right by work. Lowes sells the Mapei and it's a bit out of the way. I'll just return the mosaic mortar I currently have when I'm out that way. I need something that'll work with the aquadefense membrane and the mosaic with decorative backing.
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Unread 01-24-2021, 09:39 PM   #32
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Since you’ve got all Mapei stuff going so far, I’d call Tech Support to see what they say about that decorative coating on that back of that glass.

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Unread 01-24-2021, 10:09 PM   #33
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Dave, Custom Building Products makes a Glass Tile Premium Thinset Mortar, which would be sold by Home Depot, but I don't know if it would be stocked at your local Homer's. Can't vouch for it personally, never used it, but it's specifically aimed at your application.

While the relatively recent ANSI A137.2 publication specifically for glass tile doesn't specify a particular mortar or mortar type, it does note that not all A118.4 mortars are created equal and some may not be suitable for glass tiles. That's almost certainly why MAPEI requires the additional polymer additive for their mortar when used for glass tiles. Some of that may also have to do with the different types of glass and in your particular case where you're not actually bonding to glass, that would add a further complication.

I agree with Goldstein that talking directly with MAPEI (they have a good technical phone line response) about your particular tile might be a good idea.

The A118.10 waterproofing membrane portion of your equation requires nothing more than a modified mortar meeting A118.4.

My opinion; worth price charged.
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Unread 01-25-2021, 04:05 AM   #34
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Thanks guys. I'll give them a call later today and let you know what they say.
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Unread 01-25-2021, 05:43 AM   #35
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HD near me does have this. I will be picking it up after work so I can continue working tonight instead of wondering if the Mapei will work. This is the mortar you were referring to correct?
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Unread 01-25-2021, 08:16 AM   #36
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Good catch on the mortar, fellas, I saw the Glass box checked on the bag and looked no further.

Dave, if your glass has an actual painted back you might consider calling the manufacturer directly to see what they recommend for a mortar. Might remove all doubt.
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Unread 01-25-2021, 08:27 AM   #37
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I've used that thinset for glass tiles a couple times. It seems to work just fine although a little expensive for only 7 pounds.
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Unread 01-25-2021, 09:07 AM   #38
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Contacting the tile manufacturer was useless. They don't recommend the mortar, "contact your installer". Asked about the backing on the tile and they said mesh. Lol, wth
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Unread 01-25-2021, 09:09 PM   #39
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Wha? Mapei clearly refers to a decorative backing in their instructions. Mapei usually has the info straight and quite reliable. Hmm.
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Unread 01-26-2021, 07:44 AM   #40
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Quote:
Originally Posted by Dave
Contacting the tile manufacturer was useless.
Well that's aggravating.

Since the (maybe) painted backing is suspect I think the only way to know, to really know, what will work is to do a test board. Purchase a mortar you think will work, a small board of some kind, scrap of drywall is fine, and stick some of those tiles to that. Wait a day or two and see if they fall off or the decorative backing is compromised.

Or maybe just drop a few into a cup of water and wait a couple of days. See how they come out. That'll at least tell you if the backing is affected by moisture.

Whatever your comfort level is.
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Unread 01-28-2021, 06:42 AM   #41
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I ended up using the mortar from HD pictured above. It's been a few days now and it seems to have done a good job. It's held firmly in place and hasn't distorted color in any way.
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Unread 01-28-2021, 10:39 AM   #42
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Well, that'sa big ol' test board, Dave. Glad it worked.
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Unread 01-30-2021, 09:26 AM   #43
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Trying to find some info on sealing grout. Do I need to? What sealer should I use? I will be grouting with Mapei Keracolor U unsanded grout.
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Unread 01-31-2021, 02:18 PM   #44
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I wouldn't, but you certainly may. If you do, I would suggest you use one recommended by the grout product manufacturer.
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Unread 01-31-2021, 04:40 PM   #45
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I wouldn't seal it unless you're eating spaghetti and meat balls in there. That said, we have sealed hundreds of showers mostly because the builder, designer and tile shop said it was a good idea. Not wanting to let them down, we sealed them, charged them a few hundred dollars and we all go home happy.
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