Replies

1. 
   Guest_ | Sep 29, 1999 12:00am | #1

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   El,

   The biggest problem in what you would like to do is making sure that the tile on the walls and floor is in "sound" condition and well attached. There is no use in put new tile over tile that is falling of the wall.

   If you should determine that the tile on a whole is in good condition and a candidate for re-tiling then do this; Remove or repair any tiles that are not in good condition. You can fill any hole lift by the removal of tile with a "stiff" mix of thin set mortar. Remove any lose grout then scuff all the tile with an 80 grit sand paper. This is not absolutely necessary but, just helps provide a tooth for the new thin set to "grab."

   Once your done wash everything down with TSP. (Tri-sodium-phosphate) You "should" use a epoxy base thinset cement to install the tile. You can buy an additive or purchase the thinset with it already added. You should "try" and work neatly with this product because it's a bitch to clean!

   Joseph Fusco

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2. 
   El | Sep 29, 1999 01:59am | #2

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   I'm so glad you didn't suggest to score the old tile! The tile is in great shape considering it's such an old bathroom. What additive should be added to the epoxy thinset? Many thanks for your reply.

3. 
   Guest_ | Sep 29, 1999 03:13am | #3

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   I have tiled ove existing tiles many times.I have always done what Joe F. suggests except that i just used regular ready mixed wall mastic.I have never had a problem with adhesion, in fact I had to remove some tile and found it really hard to do. The biggest problem is that the mastic takes much longer to dry when it has no air or over a non porous substrate,so wait to grout til your sure it is dry.They also make a tile cap for tile over applications(for the top row or bullnosed areas).Call Dal Tile

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   Guest_ | Sep 29, 1999 05:07am | #5

   *Tile over tile no problem. Epoxies work great, cost alot and are more toxic than good thinsets. Mastic with large tile could take a damn long time to dry and I don't recommend that approach. Joe F's bullet proof prep won't hurt. HB Fuller's TEC 390 is a wonderfull full flex thinset that I would use for this application every time. No additive used with this, add water and enjoy. Despite the fact that it costs more than most thinset $20 and change for 50lbs its worth considering even for everday use.Joe

4. 
   El | Sep 29, 1999 05:07am | #4

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   I have a really old bathroom (circa 1929). The once white glazed tiles are now yellowed and crazed. Can I tile over them? Do I first need to cut grooves or rough up the tiles for the adhesive to stick? What kind of adhesive should I use? I really don't want to tear off the old tile if I can help it. Many thanks for your advice.