re-tiling

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Old 02-08-14, 03:41 PM
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re-tiling

Hi all,
I will be remodeling a bathroom and it has existing tile laid on the floor. I know I will have to break it up and scrape, but will the resulting mess be good/flat enough to re-lay the new backer board on, or will I also need to replace the subfloor?
 
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Old 02-08-14, 07:34 PM
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The only way of telling is when you do it. If lots of thinset is stuck to the floor and can't be sanded smooth then youy need to replace it.
 
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Old 02-08-14, 08:01 PM
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Thanks. What do people typically use to sand the thinset off of a floor?
 
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Old 02-09-14, 07:25 AM
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I use a floor scrapper not a sander.
 
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Old 02-09-14, 08:26 AM
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I know to use a floor scraper, but i mean when you are done, arent there some portions that just wont budge when trying to scrape? So for that leftover stiff it sounded like Norm201 suggested sanding, so that's why I asked what kind of sander.
 
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Old 02-09-14, 08:42 AM
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Use a very rough grit. You want to get the high spots off. Any grooving ot gouges must be filled in.
 
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Old 02-09-14, 08:46 AM
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Thanks Norm. So do you think an 8" body shop style rotary sander would work OK, or something larger? I have one of those, and some 36 grit.
 
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Old 02-09-14, 10:51 AM
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You will set cement backer board on top of the subfloor in a mortar bed created with a 1/4" x 1/4" (or 3/8") trowel. The floor does not have to be super smooth.

How old is the tile job? If it has some age to it, it will be on a mud bed with wire lath. The mud bed will be set over 15# felt paper so that no mortar will be stuck to the floor. If it was installed directly on the plywood, then simply hitting the mortar with a hammer will dislodge it from the wood.
 
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Old 02-09-14, 11:58 AM
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What czizzi says. I assumed you had large pieces that were not chipping off. If you used a chisel you might gouge it bit. That's why I said to use a filler if need be. But, super smooth is not necessary, just smooth enough to be level.
 
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Old 02-09-14, 12:05 PM
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OK thanks guys. I did not start this yet, but wanted to get my questions out of the way now instead of getting stuck during the project and waiting for advice.
 
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