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sixsticks

10:14AM | 11/22/06
Member Since: 11/21/06
1 lifetime posts
Bvflooring
Hi~

We just built a new house with 18x18 porcelain ceramic tiles on the main level of the house.

The builder's flooring contractor laid 2 different colored tiles and it now must be redone. I know what it's like to remove a tile floor (NIGHTMARE OF A MESS) and they are insisting on laying the new tile over the new existing tile.

I had never heard of the possibility of doing this until I started researching it.

While I have read it can be done, somehow I don't feel good about it. My obvious concern is how well it will bond and stay bonded.

Anyone have any good info for me on this?

Your help is appreciated!

Tileguybob

03:21PM | 11/22/06
Member Since: 07/03/05
283 lifetime posts
Removing it is a dirty dusty job and may entail removing baseboard molding also. Going over tile is OK but only if the existing floor is not showing any cracks in the grout or cracked/loose tile. The existing tile should be roughed up with a sander to help improve the bond. The thinset should be one where a latex additive in liquid form is added to the thinset instead of water when mixed at the jobsite. The reason is because it is the latex which forms the bond more so than the cement so adding the latex rather than buying a bag of modified thinset which has the additive in it in a powdered form will give you a superior bond. Modified thinsets are priced by the level of additive put into the bag so a $15 bag wont have as much as a $30 bag. If your contractor was going to use a superior modified thinset like Tec Super Flex (around $45 a bag) then that would be OK but I would not advocate using the $15 bag over a mixed on site additve/thinset combination.

Now after all that, two other things to look at. The additional height of the new tile may interfere with door swings, including your entrance doors and appliances like stove height and dishwashers. The additional height will reduce the profile of the wood baseboard trim if it is not removed and reset after the new install. Also, the added weight of the new tile could push your subfloor past its capability if this is a wood subfloor. A cemnt slab would not be a problem. An engineer should calculate the weight per sq ft on the floor figuring in the new tile over the old and see if the joists are rated to support that kind of weight without buckling. A deflection rating of L/360 is needed for a ceramic tile floor, the engineer and builder should know this, but it is a calculation of how much the floor sags under the weight of things on the floor and in the room (appliances, cabinets, countertops, people, etc)

Since you paid for the job to be done right dont let them bully or con you into anything you dont feel comfortable with. If it means you moving out while they remove the old, so be it. Get a lawyer to make sure they dont try to worm out of their warranty responsibilities and take plenty of before pictures so if anything is missing or broken thee wont be any questions or fingerpointing.

flooringworldDOTorg

07:08PM | 12/01/06
Member Since: 10/28/05
312 lifetime posts
bob is right ...

as long as they prepare it properly (scarification and utilization of modified products), the exising tile system is installed correctly, and it's subfloor and backer bard system is installed correctly, then technically there isnt a problem, going over it except for height concerns in the additional height it adds, however, you should NOT have to live with the height if it causes a problem for you or if you feel in the future the additional height will be an issue.

Personally, I would have the them rip it out and do it right, but thats just me ... i'm a hard nose and demand perfection because thats what i demand of myself.

the more you make them work the longer they will remember and not screw up in the future.

_____________________________________________

There are two ways to do any job. The right way and the wrong way. Do it right everytime.

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http://flooringworld.org/

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