Discuss Tiles coming up, cracks, and hollow points in the Tiling Forum area at TilersForums.com

DazedConfused

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I recently had my whole ground floor tiled as part of a larger renovation project.

On moving back in I noticed a tile with a crack in it which the contractor said would be replaced.

Over the course of the next two months, a few more tiles developed cracks in them and a few lifted off the floor (assume the adhesive failed)

I noticed that pretty much all the tiles have numerous hollow points on them which I know is not indicative of a problem but when they took up the visually impaired tiles, I did notice a remarkable lack of adhesive coverage.

They are 900x900 porcelain tiles weighing in at about 18kg each. It is my understanding that these should be laid on a solid bed with as close to 100% adhesive coverage. Going by the adhesive left on the substrate, it wasn't even 50% on these tiles, and the residue on the large piece of broken tile I'm holding up makes it look like only 25% of that tile was touching any adhesive. Should these tiles have been back buttered as well?

This explains why those particular tiles had issues but all the other tiles have numerous hollow points. That in conjunction with the obvious gaps under the tiles adjacent to the ones that were taken up make me think most of the tiles were laid in the same way and suffer from the distinct lack of sufficient adhesive coverage.

The contractor is saying that because the majority are not showing any issues, that they do not need replacing. They are also trying to say the underfloor heating being turned on too soon and too high caused the problems. This seems to be a red herring as heating has nothing to do with the incorrect application of adhesive.

Would I be correct in saying that it appears the majority of the tiles have not been laid to a high enough standard and need to be redone?

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whitebeam

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How long after the tiles were fixed was the underfloor heating turned on and what temperature ?
 
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D

DazedConfused

Member of Tilers Forums
text book UFH commissioning by the sound of it.

That screed though. Without wanting to assume what it looks like, do you know what screed it is?

I'm only going off what the contractors told me but I assume it's the normal sand/cement mix. At what ratios they used I have no idea
 

timeless john

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You need to know exactly what the screed is to get the information from the forum that may help your case.
The tiles should have been solid bed fixed.
 
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Waluigi

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Yes, look at what John typed regarding the screed type. I agree that the fixing method was wrong but the adhesive used and prep of the floor might also be wrong. I would try to get some details from your contractor.
 
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