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peter1 09-01-2007 08:37 AM

Tiling - Uneven floors
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I removed the carpet today in preparation for tiling and noticed patches at various locations. I assume they were attempts to level low spots, but not 100% certain. Does it look like self leveling component when dried (pictures attached)? How come they all cracked and falling off?

I guess the real question is should I clean them off? Does more glue make up for the low spots? Does the concrete floor have to be very flat/even in order to tile?


DeeTee 09-01-2007 01:44 PM

Prep is Important
It sounds like you're using a vinyl tile since you mentioned glue. If it were mine I'd clean up those spots, removing the loose stuff and the stuff that isn't stuck well. Get some leveling compound and float out the patches so it's as level as you can make it. Check the instructions on the product you select since you may need to use a bonding agent first. This is something you probably only want to do once so some extra care now will give you a better, more trouble-free job. :yes:

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peter1 09-01-2007 04:15 PM

Thanks for your reply.

I intend to use porcelain tiles, does it make any difference?

DeeTee 09-01-2007 09:21 PM

Ahhhh, Porcelain!
Porcelain and ceramic are more forgiving since you have that bed of thinset, still, you want a firm substrate that isn't flaking or chipping and with minimal sharp variations.

JJC 09-02-2007 10:30 AM

Ceramic or Porcelain are not more forgiving than vinyl since they don't flex and move with the floor as does vinyl. Remove all loose patching. Test slab for sealers. Drops of water placed on the slab, and if not absorbed within 10 minutes, then it is has a sealer. You will have to scarify the slab in order to allow the thinset which is comprised of Portland and additives to bond to the cement slab. This is usually done with a large floor buffer and coarse paper. This breaks the thin sealed layer allowing the bonding to take place. If not you will have the famous 3G's working to hold everything together. That's God, Gravity, and Grout. I noticed from the pics. that there is hairline cracking in the slab. Seriously consider a uncoupling membrane or crack isolation membrane for the floor. Otherwise those cracks will show through your new floor and all the money you spent will be wasted.
The slab will need to be flat. The industry standard (ANSI) says the maximum variation allowed is 1/16" in 12". This is true for anything starting in size of 12" and larger. Sizes smaller than 12", will have a tolerance of 1/4" in 10-0". Again if this is not maintained or properly prepared, lippage will happen. Lippage is the difference in height from one tile to the next. The patching compound or material should be of a cementitious type, as others will more than likely disintegrate when wet, and cement type products are installed when wet.

peter1 09-08-2007 09:36 AM

Thanks for the advices, I will clean it up before tiling.

Went to shop for tiles, I didn't know they are so heavy until I tried to pickup a box.

JazMan 09-08-2007 05:19 PM

OK, so where did you go shopping and what did you bring home?


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