tiling over tiles & underfloor heating

[nerja]

Hi,

I am planing to update my kitchen and intend to lay new ceramic or porcelain floor tiles. I built the house myself 12 years ago and istalled a wet underfloor heating system which is just fantastic. The existing ceramic tiled floor is still in excellent condition, sound and level and I would normally be quite happy to fix the new tiles on top of them.
My question is this, does any one know if a second layer of tiles will have a detremental effect on the performance of the underfloor heating? ( i.e the bedding layer of fixer could create some air spaces ) I know removing the existng tiles will not be easy and would like to avoid that if possible.

Thank you.

 

[mytileshop]

Re: Tiileing over tiles & underfloor heating

i wouldnt think it would affect the perfomance of the heating if the floor is good you can lay on top a would always say if you can take them up then do so if not i think you will be fine
hope i helped

 

[david campbell]

Re: Tiileing over tiles & underfloor heating

there shouldn't be any any spaces really,you should be looking for between 90%-100% coverage on floor tiles,my main concern is the tiles are sound as you say then the height differences between rooms,and you will have to cut around all obstacles like the kitchen units,your skirtings and facings should also be removed and adjusted to suit new height

 

[The Legend; Phil Hobson RIP]

Hi and:welcome: I would be tempted to take the tiles up, but if you are happy to go on top. Good luck

 

[DHTiling]

Hi and welcome .. another thing to consider is that the new tiles will expand at a different rate to the old ones and they expand at a different rate to the substrate, this could result in cracking issues IMO.. So worth keeping this in mind.

 

[White Room]

Hi and welcome

 

[faithhealer]

welcome to the forum, good point by Dave there.

 

[doug boardley]

I'd also be tempted to use a de-coupler membrane esp if you're going over the old tiles.

 

[nerja]

Hi to all who have been so kind to reply so quickly. You have convinced me not to take an unnecessary risk. I might invest in a Little Mutt Pro ( £20 from Toolstation ) and get stuck in along with my trusty Club Hammer and Bolster.

Thanks every one.
Nerja,
Cumbria.

 

[DHTiling]

No probs, enjoy and please do let us know how you get on.. maybe even a few pics..