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Old 05-09-2013, 01:31 PM   #1
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tiling over tile ceramic


Going to redo my shower stall, it is about 3X4X3', 7' tall and has 4X4 gloss white tile floor to ceiling.

The man I have hired is a tile guy who has a good reputation. I told him I will do all the grunt/Gopher work and make the job as easy for him as possible.

I am putting in a 20X20 ceramic tile over the old 4X4 on the shower walls. He told me to order a type 2 mastic for the walls.

I thought I had read that the mastic's were not good to use, that they would not dry, especially under large tiles?

Is my memory faulty, did I mis understand something, or is this OK? JIm

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Old 05-09-2013, 02:15 PM   #2
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No this is not okay. You are right, do not use mastic in a wet area.

While tile over tile is okay under some circumstances, I would not do it in a shower.

How old is the shower? Any problems with it? Loose tiles? Leaks? Smells?

Tile and grout are NOT waterproof. Don't expect a new layer of tile to fix any underlying problems.

Also consider the extra thickness regarding the drain, fixtures, etc. Are they going to fit?


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Old 05-09-2013, 07:28 PM   #3
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The tile that is there is in great shape! 25 years old and not a loose tile . Old looking, dated, but solid.

I did take an old tile off, bullnose at the edge. Very little adhesive on it. So I am looking at it and it is mastic, well maybe not mastic but definitely not thinset!

So what did they use 25 years ago that is so durable?

Thanks for the response. JIm
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Old 05-10-2013, 02:27 AM   #4
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The old mastics were solvent based--and worked rather well---over the absorbent backer---

The new mastics are organic water based. They need air to dry---how much air will get in between the old tile and the new 20x20 tiles? Will it ever dry? Nope---

When it gets wet it will dissolve.
Do this right--rip out the old tile and backer---replace the shower mixer valve and use a proper cement board backer--water proof that--then tile with a powdered thinset---
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Old 05-10-2013, 06:57 AM   #5
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Thanks for the responses, always appreciated. I did a bit of reading on the mastics and not going to use it!

I am surprised, the man I hired is a tile setter, been in the area a long time and is well thought of. He did a job for me a few years ago and I was pleased with his work!

The floor in the shower is concrete, FL, concrete slab house. I took the tile off the curb and it is a tough job, the tile is set in a white product and it is not coming loose!

Which brings me to the floor, the floor tile are set in the same white material, I have no desire to try and remove the old tile. What is the preferred method to prep the ceramic tiles on the floor for new tile set in thinset?

Thanks JIm
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Old 05-22-2013, 09:43 PM   #6
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Tile over tile on a floor is a safe method when done correctly---

First clean well, then scuff sand the tile--I use an angle grinder with 36 grit paper (two disks,back to back)

Then use a two part thinset like Kerabond mixed with keralastic---that has always worked for me---

Some premium modified thinsets will also work---check with the manufacturer---
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Old 05-23-2013, 01:01 PM   #7
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