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Tiles don't seem to be adhering to the walls. Have I used the wrong thinset?

Tiles don't seem to be adhering to the walls. Have I used the wrong thinset?

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  #1  
Old 12-27-15, 01:22 PM
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Tiles don't seem to be adhering to the walls. Have I used the wrong thinset?

I had a couple mistakes on aligning two large pieces of tile (12 x 24"). Its been a little over a week, so I decided to just take a tile hammer and bust out the tile. Amazingly, I was able to remove the tile rather easily with no damage to the tile. In fact, I touched the thinset after removing the tile and it was still moist! It hadn't hardened well at all, even after more than a week of curing time.

What have I done wrong? The only thing I can think of is that I must have used the wrong type of thinset. Also, I have already painted a full layer of Redgard waterproof membrane on the wall. Could I be that the Redgard is somehow preventing the mortar from solidifying?
 
  #2  
Old 12-27-15, 03:42 PM
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I assume you used ready mix mastic that came from a tub instead of a powder. The fact that the material can sit for years on the shelf without drying out tells you that if you put it on a watertight wall (with redgard) and a watertight tile, that it would never dry out. Further as you said this is on walls, is that if this is in a wet location then you need to know that mastic is never rated for use in wet locations like a shower. Thinset comes in powder form and is mixed to order.
 
  #3  
Old 12-27-15, 07:21 PM
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Oh no! That's a bummer.

I am getting ready to tile the shower walls and got a tub of this product.

I used it for the wall base and it's holding fine. But I realize that a wet shower area is an entirely different matter.

Curious to know exactly what product tonic used.
 
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Old 12-27-15, 09:02 PM
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This is what you should have used: Thin Set Mortars | Custom Building Products
 
  #5  
Old 12-28-15, 08:52 AM
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And that's exactly what I will use, since I am yet to start tiling the wall.
Thanks for the tip.
 
 

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