Preparation Advice, losing faith in tiles..

Discuss Advice, losing faith in tiles.. in the Tiling Forum area at

Richard Nessbert

Active Member
Hi all,

Sorry if this is the wrong place to post this, but I'm really stuck with what direction to go next.

To cut a long story short, we moved in to a new build house 8 years ago. When we purchased the house, we knew the ground floor tiles needed to be replaced as the tiles had not stuck to the floor.
Before the second lot of tiles where laid, we had various tilers and even the area director for mapei come and look. However after a year the tiles started to come up again, in the main walkway. We just lives with them that way, until now. We have just had an extension so the ground floor needs to be relaid again. The problem we have is no tiler seems to be able to identify what the problem is and therefore won't guarantee their work.

What I know... The floor is a Liquid self leveling screed not the cement type and we have a water based underfloor hearing system throughout the ground floor.

When the floor was tiled the second time, I was told he bonded the floor and used Mapei Flexible adhesive..we paid him £30sm to lay it as he seemed highly recommended.

Now... We believed for a longtime the problem the second time was not the adhesive or way it was laid, but the choice of tiles. We went with Quartz, as no one mentioned the lack of suitability to underfloor heating. However I have just taken one tile up and none of the adhesive has stuck to the floor.. Its all on the tile, which makes me think the tile wasn't the problem.

I have read hundreds of articles and have multiple tilers look, but they all give different answers and none say they are 100% sure.

So the question to the faithful here is, has anyone come across this before and can anything be done to stop it happening in the future.

I have attached some photos to help.

Also I'm in newport South Wales if anyone wants to take the job on.. Its around 40sm area.

Thanks for any advice

IMG_20180915_214626.jpg IMG_20180915_214710.jpg IMG_20180915_214745.jpg IMG_20180915_214736.jpg IMG_20180915_214751.jpg IMG_20180915_214632.jpg

Richard Nessbert

Active Member
Just to confirm photo 5 of the adhesive on the floor, is from a different part of the kitchen where I lifted another tile.. Maybe no underfloor heating there?


Trusted Advisor
Professional Tiler
JOTM Winner
If it's not a cement based screed then it's a calcium sulphate screed. They need to be treated properly ie sanded primed and gypsum adhesive or barrier primed. Quartz is not a good idea with underfloor heating. Make sure whoever does it next preps it properly and uses correct materials. Good luck

Richard Nessbert

Active Member
Thanks Hm, I mentioned the sanding to the tiles when they came to price and I just got blank looks, they did mention priming the floor though. I guess sanding the whole area adds considerable time to the job. Would you stay this is still needed even on an 8 year old floor?

Thanks again


Unregistered (Please Register)
Sounds like this time you need a professional. The substrate should’ve really been flagged by someone and as said, sanded back before tiling. It’s basic knowledge for a Tiler.

Richard Nessbert

Active Member
I basically have until Wednesday to cancel the tile order and switch to engineered oak flooring.
If anyone is local to Newport and is confident they could get this done, please let me know ASAP
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