Porcelain Tiles - Staining and water ingress

[p20nty]

Hi. I have recently partly laid a bathroom floor using 2'x1' porcelain tiles in my home. The tiles are laid on a 3 ply substrate secured at 6" centres on a new 22mm chipboard batroom grade floor. The tiles were wet cut and laid using (Brand Blocked Temporarily until they unblock us on facebook) ProRapid flexible tile adhesive. The day following laying I noticed staining of about 70% tiles which could not be removed using proprietary agents - Flash etc. Appeared as though the stain was under the glazed finish. Inspection of other tiles in the same batch does show staining (before laying). A simple water test on the tiles show water will cause temporary staining of the tiles before they dry out, the supplier arguing that this 'is acceptable and normal for their porcelain tiles' - I thought porcelain was impervious to water? However, on the tiles I set out, cut and laid there was no staining apparent at the point of laying them. The supplier argues that I should not have laid a clearly defective producy, but I contend the stains on the tiles I laid were not visibly stained during laying process (otherwise I would not have laid them). It is the consequential issues of the time cost of ripping up the sub floor and relaying alternative tiles that concerns me but not the tile supplier. Can anyone offer advice please.

 

[Andy Allen]

Are the tiles polished porcelain..?

 

[p20nty]

Hi Andy. Yes tiles are polished - confirmed by supplier.

 

[Andy Allen]

Did you seal them..?

 

[p20nty]

These are polished and sealed tiles - again confirmed by the supplier 'no sealing required'.

 

[ttt tiling]

I'd be really surprised if the tiles didn't dry out . Unglazed porcelain can be sealed once fully dry.

Suppliers can be very holier than thou once the tiles are fixed and if the tiles don't dry out threaten small claims court and bad press!

 

[p20nty]

Yes, I've been careful to avoid naming the supplier - but a big local name. This could very well end up there. The buyer confirmed with supplier that it was a 'defective batch' but all the supplier (to us) is prepared to do is compensate - at cost for the 'unused tiles' - not for the stained laid ones, tile adhesive and 3 ply sub floor boards!! They argue I should have been aware of staining BEFORE tiles were laid. But, I argued that despite marking out tiles (dry and clean) cleaning with clean water after wet cutting and cleaning after laying I should have seen the defects! I would NOT have laid them had the staining been that obvious.



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[Andy Allen]

Im confused. ....you say the staining is under the glaze......polished porcelain tiles are not glazed there a porcelain tile that has been polished some are more porous then others depending on the quality and there fore require plenty of sealing to stop them staining even before fitting..

 

[p20nty]

Perhaps I have used the term 'glazed' incorrectly. I mean sealed. 'Polished and sealed' was the term used when I bought the tiles and would be suitable for bathrooms / showers. The staining appears under the sealed - polished' surface. I noticed today when tiles were removed from packs for further inspection, they were packed in pairs - polished surface to polished surface. And, on some 'pairs' there were 'greasy' type stains, which, when surface wiped, still left marks on the polished (and sealed surface). That's why the supplier has acknowledged the batch was faulty - c80 tiles in total, 60-70% appearing stained to a lessor or higher extent. Point is the tiles I laid, when I laid them didn't manifest staining until following day.

 

[CJ]

Has the surface of the tile got a waxy feel to it??

 

[p20nty]

Yes the surface does appear 'waxy' - would that be the sealing applied at manufacture? I can upload an image(s) of staining if that helps. Thanks to all those who have responded so far.

 

[Andy Allen]

Could be transit wax used to prevent damage during transit..

 

[p20nty]

 

[p20nty]

Not really, tiles were copiously washed and wiped to give a good 'optical' type finish prior to and post cutting. No waxy finish therefore at installation. There is clear staining to a lessor or greater degree. Take a look at these pics.

 

[p20nty]

Any signs of 'waxing' removed to give a good 'optical' finish except staining.

 

[mz30]

buy a wax remover water is not going to remove transit wax, no matter how much you clean them.

 

[p20nty]

Can you suggest a good sealant for porcelain tiles that will penetrate polish. I have used a sealant on slate 600x600 tiles before I laid them but assume this is not appropriate for porcelain.

 

[Sean Kelly]

It does look like transit wax to me. As mz30 said, water will not remove it. Normally you will see some sort of pattern to the wax marks......like a cross or a couple of lines made with a wax marker or whatever they use. I once had a tile with a smiley face drawn on with wax! You will have to use whatever the shop recommends as if you buy your own then the shop could say you should have used ours and now we are not liable for any damage caused. Good luck.

 

[White Room]

I've used meths on porcel-thin to remove the transit wax....

 

[CJ]

It does look and sound like transit wax.

Be worth getting a wax remover and trying on a inconspicuous corner.

 

[p20nty]

Ive tried petrol on a tile - no effect - will try meths tomorrow.

 

[Time's Ran Out]

I've used meths on porcel-thin to remove the transit wax....

What a waste - hic!

 

[Lithofin BOB]

We have wax off solvent stripper, you could test an unlaid tile strip half- do a water test on both sides. Then test one tile laid if the stripped half then takes water but has removed the contaminant , once all tiles stripped,you can then replace the nano seal ( pre- seal) with a suitable porcelain sealer.

 

[Dan]

Just bumping some of the older popular (sometimes not so popular) threads. Probably wont be current discussion these days but I just need to do it. So just ignore the thread if it's not current for you.