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Unread 09-30-2013, 07:44 AM   #1
jm66210
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Tiling over tile

Ugh...Going to go look at a job tomorrow that involves tiling over an existing tub surround. I haven't seen it yet, but they say it's "sound" , just ugly. 1930's house, so it's tile over mud, with mudcaps & typical trims. Any ideas? Would this be an application for kerdi board? Should they call bathfitters?
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Unread 09-30-2013, 07:53 AM   #2
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What kind of tile do they want to put over it?

Any problems with the control valves with another tile thickness added?
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Unread 09-30-2013, 09:14 AM   #3
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should be able to manage the valves/spout. Gonna use whatever tile I suggest. Probably 4 x 4 ceramics so I can get the necessary trims to go with it.
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Unread 09-30-2013, 10:07 AM   #4
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You can use 2x6 radius (A4200) cut down to make a "long" quarter round.

Make sure to TSP it, and use a bonderizer before tiling.
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Unread 09-30-2013, 02:14 PM   #5
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without seeing it, add one vote for kerdi board thinsetted over the tile
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Unread 09-30-2013, 08:28 PM   #6
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Be mindful of how narrow the back shoulder (ledge) of the tub is. Specifically in the middle of the 5' wall where the shoulder typically gets pretty narrow. Adding thickness over an existing tile job might be too thick to the point where it overhangs the wall of the tub. It would be unsightly.

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Unread 10-01-2013, 08:15 AM   #7
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Yep, good point on the shoulder thickness. Kerdi board adds just that more thickness too, but I think a waterproof layer is important. Any other options?
Hydroban, redguard, kerdi, between the old & new tile? Thanks!
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Unread 10-01-2013, 08:32 AM   #8
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Kerdiboard comes in many thicknesses from 3/16" to 2"

You can also use kerdi fabric over the tile to save even more room.
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Unread 10-01-2013, 11:47 AM   #9
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May want to check out a Mapei product called Eco Prim Grip....May be just what your looking for in the situation at hand. It's made just for this process.
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Unread 10-01-2013, 10:15 PM   #10
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I'm in the John Holmes school of thought on renovating. Wherever possible tear it down to studs and start over. But sometimes that's just not in the cards. Thinset bonds really well to most tiles, if they are roughed up.


Some guys just get carried away, I definitely would not call myself a hack, but I see no problem with just roughing up the glaze with a diamond cup wheel and tiling over the old tile. Putting kerdi, kerdiboard, hydroban, etc on it just adds cost and thickness. If the old tile stayed put for 80 years, it should last a few more.
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Unread 10-01-2013, 10:20 PM   #11
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Its its been in place for 80 years, I'd try to get them to take out the old completely. You won't ever get a better chance to bring the drain and trap, the supply lines, the valve, the framing, etc up to snuff. Then you can build something that will last em that long again.
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Unread 10-02-2013, 02:59 AM   #12
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Went and looked at the bath today. Tiling over tile just doesn't seem to make sense to me, and is just prolonging the inevitable. Seems like it would be creating a moisture sandwich as well. There are a few hairline cracks radiating from the plumbing fixtures which may or may not cause problems. Tub is etched anyway & will need to be replaced in time. They suggested having the tub "restored" by miracle method so I suggested they have them do the whole bathroom. That would be a good 5 year solution, eh?
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Unread 10-04-2013, 07:44 AM   #13
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They are begging me to do the job, so I looked into the Eco prim grip. I just don't see the benefit of using a product like this as opposed to using something like laticrete 254. I explained that this job gets a "rear view mirror guarantee", and will just add to the demo cost in the future.
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Unread 10-04-2013, 06:12 PM   #14
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You would use the prim grip ALONG with a quality thinset like 254....save the scarifying process and create a sound bonding surface without all the dust.
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