Tiling on top of floor tiles

[abcd]

Hi
I have a concrete floor which has been tiled with quarry tiles. All the tiles are sound. I want to tile the floor again and was wandering if anyone knew if it was possible to tile over the existing tiles and if so is there anything special I ned to do? The tiles have a matt.rustic surface.

 

[jefoss]

it is possible, i take it they are pretty flat then , but im thinking if they are quarries they would be pretty think, have you thought about this? if you get standard size tiles on top including adhesive, you are talking about adding up to 12mm on top! and most quarries are a good size too. you may need a ladder to enter the room

 

[abcd]

Hi jefoss, thanks for the reply. Yeah the main reasons I want to tile on top of these tiles is that they are stuck fast and that the room (don't ask me why) is lower than both rooms its adjacent to. Its a hallway with a kitchen on one side and a utility on the other side. Both the other rooms are tiled as well. The hallway is 12-14 mm lower than the other rooms.

I'm hoping if I thoroughly clean the floor I can go straight over the top.

Does anyone know if I need a special adhesive?

abcd

 

[jefoss]

Tiling onto tiles is fine so long as the existing tiles are good and flat. Give them a good washing down with sugar soap (and rinse) before you tile.

make sure you stagger the joints so that youve not got joints matching up anywhere, sounds like your floor may be nice and level by the time you finish!

when you get the tiles ask the dealer what adhesive would be appopriate for the tiles you buy.

there will be a few suggestions off here no doubt and mine would be a porcelain adhesive. (and yes i would use this no matter what tiles you were using - porcelain or not)

 

[gcol]

Good advice Jef. I wouldn't necessarily worry about staggering the joints on a concrete floor though.

 

[abcd]

thanks both. Its done!!
Looks good for now anyway.

 

[gcol]

Nice one. Feel like showing off and posting a few pics?

 

[willnabby]

Hi I'm new on here & it looks like a very useful forum that I will use regularly Can anyone reccomend an adhesive for tiling over very sound flat ceramics with black natural slate tiles? (it's a concrete floor underneath)

any help is much appreciated.

 

[gcol]

Hi I'm new on here & it looks like a very useful forum that I will use regularly Can anyone reccomend an adhesive for tiling over very sound flat ceramics with black natural slate tiles? (it's a concrete floor underneath)

any help is much appreciated.

http://www.trades-direct.co.uk/modules/shop/view.asp?Prodcode=1997-101

 

[willnabby]

Thanks for info GCOL,

I've got 12sqm to cover, how many bags of that would i need? ( can't make out the writing in the photo), can i definatley tile over tiles with that?

Thanks again.

 

[gcol]

It depends on how thick you need to make the adhesive - if your tiles vary in thickness, you'll be packing up thinner tiles and therefore using more adhesive. As a rule though, for uniform thickness tiles, I generally allow a 20kg bag for every 4 metres. So if your tiles are uniform in thickness, you should be ok with 3 bags.
Yes you'll be ok with that adhesive to tile on top of existing tiles.

 

[willnabby]

 

[gcol]

Just make sure the existing tiles are spotless before tiling though - no grease.

 

[willnabby]

GCOL, can you reccomend a grout to go with the dark grey/black natural slate tiles please?

 

[jefoss]

charcoal