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Unread 02-04-2021, 02:56 PM   #136
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I see. So the reason to not use tar paper with thinset is the faster setting time means less water is pulled out, and thinset is weaker across voids?
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Unread 02-08-2021, 12:41 AM   #137
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Slipped subway tile

As usual, a mistake was made in the last 10 minutes of work - there are two tiles (3x12 subway) above a shelf-e that have slipped up nearly 1/2". I think they have pretty good thinset coverage (Mapei ceramic thinsert). Any advice for removal? It is on top of hydroban sheet membrane (on durock). A post here says to drill holes and crack off. Is it infeasible to pop off? Should I paint that area over with a liquid membrane after?
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Unread 02-08-2021, 06:27 AM   #138
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Clear out the grout lines, take your hammer and smash it up until a piece shears out. Then take a chisel or drywall putty knife to pry off the remaining chunks. Paint over it if you have it readily available
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Unread 02-08-2021, 02:21 PM   #139
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Thanks, Christopher.
I ended up taking a 2mm nail punch to focus the hammer force. It's taking ~5 mins/ tile that considering how this is taking up weeks of my time and a few thousand $$$, sacrificing an hour and a few tiles makes sense. I know I'd otherwise start every shower wincing at that error.
Pre-rewind work in progress attached.
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Unread 02-08-2021, 04:09 PM   #140
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An interesting (to me) test this enabled was that two little quarter sized nibs of tile above the shelf-e tabs were enough to keep the shelf firmly affixed to the wall and load-bearing.
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Unread 02-09-2021, 11:16 PM   #141
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Best thinset for novice?

So I've had to redo a few rows of tile, twice. First because I mixed the thinset too dry and it skinned pretty quickly, next because my tiling was so bad you'd swear the tiler was drunk and I'd swear I wish I was. I had switched from Laticrete 254 for the waterproofing membrane to Mapei Ceramic thinset to save a few $$$ (and because they used to sponsor a bike team as per a different thread). Fortunately for removing the poorly set tiles, the Mapei seemed weaker than the Laticrete.

Going forward, is using the Laticrete 254 a way to make up for skill with $$? Does it bond better to surfaces and smush down easier?
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Unread 02-09-2021, 11:20 PM   #142
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While 254 is the best thinset out there, I find it difficult less than fun to work with. As long as you get very good coverage, and are back burning your tiles, and choose a medium to good grade of thinset - the choice of thinset won't make that much difference in this case.

253 or 252 will work nicely
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Unread 02-10-2021, 12:54 AM   #143
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Got it, thanks Paul!
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Unread 02-10-2021, 07:41 AM   #144
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What Paul said. 254 is overkill IMO and a PITA in a lot of ways, but it gives ya great bonding power
253 is good and economical
If you wanna stay with Mapei: their Porcelain Tile Mortar is a step up, and Ultraflex II is above that. Both good for working time and bonding, cheaper than 254
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Unread 02-10-2021, 10:11 AM   #145
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Thanks again, Christopher. I'll give ultraflex a try. From the perspective of a novice, the branding of the porcelain thinset made it sound like it would make ceramic tiles explode
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Unread 02-11-2021, 10:04 PM   #146
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So now I need to scrape away 5sq feet of thinset. Somehow I thought my tiles were straight, but was way off. Any advice? I'm just using a putty knife and whatever temper I have left
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Unread 02-11-2021, 10:09 PM   #147
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A rub brick from any big box store can be purchased for about $14 or so. It's like a sanding block with a handle on it. But it's sandpaper on steroids. It'll grind down the mortar rather quickly.

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Unread 02-11-2021, 10:32 PM   #148
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Will try! And it's 10 sq feet. Ugh. How long does the brick sand for -- should I get two?
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Unread 02-11-2021, 10:37 PM   #149
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One will do fine. This is recently dried thinset mortar, correct?

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Unread 02-11-2021, 10:42 PM   #150
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5 days now, 6 days by the time I can get the brick
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