tiling onto a tiled floor

[cowgomoo]

Good Afternoon Everyone - long time no post.

I have a job to do, tiling onto an existing tile floor in a shop basement. The tiles at the moment on the floor are straight onto a concrete screed and very stable. They are sized about 200 x 500 porcelain with a mid sheen finish. The inevitable question is this - whats the best option ? No chance of the tiles coming up etc. Should I just rough up the surface a bit before cracking on or is chemical etching an option. I have used Watek Gutjahr matting before with great success but this is more for problem substrates I know. The tiles going down are 90 x 90 full bodied porcelain.

All suggestions gratefully received.

Cow.

 

[Stef]

If the tiles are well fixed I would score the face of the tile with a grinder to give a good key & tile on top.
I don't advise tiling on top of tiles especially on walls but on floors you can get away with it.

 

[Dave]

Mapei Eco-prim grip... Excellent product ..

 

[Stef]

Mapei Eco-prim grip... Excellent product ..

Last time I used it Dave it took ages to dry,
I got on better using my own slurry coat.

 

[cowgomoo]

Hi Stef thanks for the reply, the area is roughly 35m2, is this too much to grind = very messy ?

Cow

 

[Sean SML Tiling]

Same as dave for me. Stuff I used recently dried very quick.

 

[cowgomoo]

Good Afternoon David, just checked this out and this looks like the one for me. Just clean the floor thoroughly and leave overnight ?

Cow

 

[cowgomoo]

Thanks Sean, what did you clean the existing tiles with - LTP Grimex or the like ?

Cow.

 

[Dave]

Good Afternoon David, just checked this out and this looks like the one for me. Just clean the floor thoroughly and leave overnight ?

Cow

A good clean , towel dry and then make sure the tub is shaken and stirred , it will dry within an hr.

 

[Dave]

Thanks Sean, what did you clean the existing tiles with - LTP Grimex or the like ?

Cow.

Grimex is fine ...

 

[Stef]

A good clean , towel dry and then make sure the tub is shaken and stirred , it will dry within an hr.

Last time I used Eco grip it took about 3hrs to dry.
Took me about an hour to mix!! [emoji1]

 

[The Legend; Phil Hobson RIP]

If you store Eco-trim tubs upside down the grit will end up on the top, making it easier to mix.

 

[Stef]

If you store Eco-trim tubs upside down the grit will end up on the top, making it easier to mix.

Good shout Phil,
Think I will stick to my own slurry coat though.

 

[cowgomoo]

Just to let you all know that the job went really well, eco prim was a joy to work with and the tiles look fantastic. Just the display work now! Thanks for all your help. Cow

 

[Dan]

And where are the pictures?!