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raddad

07:56PM | 04/20/07
Member Since: 04/19/07
3 lifetime posts
Bvflooring
I am installing new porcelain tile in my kitchen. I removed the old tile and excess thinset with a rented machine. The concrete floor is still covered with a fine/smooth layer of the old thinset. Can I apply the new thinset over this floor to put the new tile down, or do I need to completely remove the old thinset with a chemical or solvent?

flooringworldDOTorg

08:39PM | 04/20/07
Member Since: 10/28/05
312 lifetime posts
check the overall flatness with a level or very straight 2"x4".

Do not confuse flatness with level.

It does not have to be level, just flat.

If you have any waviness in the floor when you check it with the level you can screed or flash patch to get it flat.

You want to view the floors relation to the bottom of the level or 2"x4". if you see any significant high spots, gaps, peaks, or valleys, then the floor may need grinded, patched, or screeded.

Else you may have problems during the isntall with overall waviness and/or lippage of the tops of the tile, from tile to tile, and may need to perform extensive pulling and buttering to keep them aligned for height.

scrape it down smooth and flat with flooring raor scrapers: http://flooringworld.org/floorsearch.php?query=floor+scrapers

when you install your tiles, have a 2' masons level with you to lay it on the tiles as you install.

If you see a low or high spot from tile to tile, pull the tile and remove or add thinset as needed to keep the tops of the tiles flush in relation to each other. Ensuring the floor is flat before the isntall makes the actual isntall process much faster and easier becasue there is less tile pulling and adjustments needed.

_____________________________________________

There are two ways to do any job.

The right way and the wrong way.

Do it right everytime.

_____________________________________________

http://flooringworld.org/

_____________________________________________

raddad

09:14PM | 04/20/07
Member Since: 04/19/07
3 lifetime posts
So, if I am understanding correctly, as long as the floor is flat, the thin layer of old thinset will not affect the new thinset from adhering the tile to the concrete? Thanks for your fast response!!!

Tileguybob

05:52AM | 04/21/07
Member Since: 07/03/05
283 lifetime posts
Thats right. The bond will be fine as long as full contact is made. Thats why it was recommended to get the floor as "unbumpy" as possible. A ridge of old thinset could lift the tile where it wouldn't be in contact fully with the new thinset, causing a hollow spot underneath that could lead to the tile cracking. Do as he said and screed a layer of thinset over the low spots so everything is pretty much on the samer plane.

flooringworldDOTorg

10:48AM | 04/22/07
Member Since: 10/28/05
312 lifetime posts
also make sure any loose thinset is removed as that could also crack a tile or grout joint in the future, then fill in voids as needed.

It important that any high spots be removed, or everything will have to be worked down from the high spots, or you could have touble with non flush lippage from tile to tile.

After rmoving high spots, screed over what you have to fill all voids, then scrape it down and check it for flatness.

Mark any high spots and depressions with a pencil, then screed/fill as needed to get everything flat (within 1/8" in 6 feet.

The more wavy your floor is int erms opf flatness or heigh intolerance, the tougher and more time consuming the actual tile installation will be to get all the joints flush.

_____________________________________________

There are two ways to do any job.

The right way and the wrong way.

Do it right everytime.

_____________________________________________

http://flooringworld.org/

_____________________________________________
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