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Old 05-02-2008, 08:44 PM   #1
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Tile guys, what would you do?


I'm gutting my bathroom, and am tearing up the existing tile floor, which is about 12 years old or so.

Underneath the tile is a layer of 1/2" wonderboard on 1-1/8" subfloor.

The tiles are popping up reasonably easily, but pretty much all of the thinset mortar has stayed put, firmly bonded to the wonderboard. In some locations, the top surface of the wonderboard has popped up with the tile and the thinset, exposing the mesh of the wonderboard.

Here's where the problem is...
The guy that remodeled this bathroom when my dad owned the house didn't do much right, but he put screws every 3" in a grid pattern through that wonderboard into the floor. There is absolutely no way I can get that wonderboard up (because the hundreds of screws are covered up and/or the heads are full of thinset), and it is in pretty decent shape overall.

I'm thinking that I could easily float a layer of thinset or some sort of mortar over the top of the wonderboard and grooved thinset to yield a smooth surface to apply the new tile to. I certainly don't want to try to mount the tile given the current condition of the surface.

What do you all think of that idea, and what mortar or thinset would you use?
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Old 05-02-2008, 08:59 PM   #2
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Tile guys, what would you do?


You could use a self leveling compound (SLC). Just look at whatever your local supplier would carry to make sure it will fit your application.
It will cover the current flooring and level it at the same time. Wait a few hours and start tiling normally.

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Old 05-02-2008, 09:50 PM   #3
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Tile guys, what would you do?


Not a bad idea...

Not too sure about availability as a bag mix though??? Is that available?

The only SLC I'm familiar with comes from batch plants and is used in big multifamily projects.
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Old 05-02-2008, 09:58 PM   #4
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Tile guys, what would you do?


Not sure what's available in your area. I know HD carries Custom products. As far as I know, all the major manufacturers of thinset make an SLC, mapei, laticrete, etc.
http://www.custombuildingproducts.co...er=arc&lang=en
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Old 05-02-2008, 11:13 PM   #5
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Tile guys, what would you do?


Nice! Thanks Angus.
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Old 05-03-2008, 08:22 PM   #6
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Tile guys, what would you do?


I just finished a real bad one too, needed a couple days of hammer and large floor chisel to get that concrete board out, yep lots of screws.
Anyway, after the rebuild, it still needed a leveling in some spots but not a full blown self level.
I just used Henry UniPro 547 skimcoat around the edges and in a bad corner, worked great.
not self leveling but very workable stuff.
I put hardibacker on top of it, so maybe a little different than your situation, but the stuff sets up real solid, it might be good for you.
Finished tile floor and cabinet sets were right on.
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Old 05-05-2008, 12:18 AM   #7
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Tile guys, what would you do?


Anywhere you have a depth more than 1/4 inch where the board lifted up I would first patch with mortar and let set, self leveller is not intended to go any thicker, you would have to do multiple layers and let each dry and that's too much time, and since you need mortar anyways..... Then roll on an acrylic bonder & let dry, and then use a self leveller (and yes they sell single bags, one will do about 60 s/f at 1/4 thick, mix it EXACTLY as the bag says!!) once set, go ahead and tile away.
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Old 05-05-2008, 12:21 AM   #8
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Tile guys, what would you do?


Quote:
Originally Posted by dochorn View Post
Anywhere you have a depth more than 1/4 inch where the board lifted up I would first patch with mortar and let set, self leveller is not intended to go any thicker
While that may be your preference, Custom's SLC is approved to 2" thickness. I wouldn't do that thick myself either but 1/4" is well within the specs.

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