A big flooring problem!

[hpandlou]

Id doubt it, the guy seems to know what he is doing with the materials and knowledge he has used. BUT you never know!

It could be the UFH leaking? Im too impatient waiting for he answers, i wanna know now! Go take up a tile

Can't be leaking - we have a fully pressurised system and there is no loss of pressure - we would have known!
Thanks

 

[mikethetile]

how did they maintain the damp proof between the two different pours

 

[hpandlou]

Did you happen to seal both sides of slate before setting them?That would affect the bonding from tile to ditra/dural.

No, the tiles were sealed after laying - tiler has done this for 30 years with fab references - I can only trust him!
Thank you!

 

[hpandlou]

Can you clarify, was the screed built up in two layers? If any one of these layers were too thin, then it could have de-bonded.
Apart from that everything seems to have been ok, Don't be too hard on your tiler

The screed was laid in one 'go' to a depth of 65mm.
I'm not being too hard at all - I know he did a good job, I just need to know what has gone wrong so it can be rectified properly. My husband is speaking to Dural to see if they can shed any light and I also intend to talk to the tile supplier as well. Will update!
Thank you

 

[Scott]

Not the best primer

 

[Brinkley]

unibonhttp://www.diy.com/diy/jsp/bq/nav.jsp?action=detail&fh_secondid=9254442

 

[Brinkley]

unibond is pva

 

[mikethetile]

even unibonds own site doesnt work LOL

I thought unibond primer / sealer was a different product to pva but the only primer I can find for sale is pva based, I cant find a non pva sealer in their range

 

[Brinkley]

i googled unibond primer and all i found was pva mike

 

[mikethetile]

your right Brinkly, I found a sealing and bonding primer for screeds made by unibond...............poly vinyl acetate LOL

 

[enduro]

Sounds like it could be slate cleave...where the layers of slate start splitting apart. Got some on my floor that creak no grout cracking, took one out and it came away in layers.

 

[Rich]

i have been following this thread with a huge amount of interest but havnt posted yet as I was completely stumped. The primer may well be the problem. I cant say that I have used any of unibonds range but if PVA was used this could well answer why the adhesive has come away from the scread.

I have found that some of the tilers with the 35yrs experience are the worst for keeping with the times, I worked for an old guy who had over 40yrs tiling under his belt and his tiling LOOKED lovely and customers loved him and recommended him. I worked with him for a couple of weeks and walked away because I knew that his tiles wouldnt last and it wasnt worth my reputation. He had no idea about the range of adhesives out there now adays and just as importantly primers.

If you do a search on here you will see why PVA is such a bad idea. I hope between us we can get this one cracked (forgive the punn).

 

[The Legend; Phil Hobson RIP]

I am hoping Ajax might shed some light on this

 

[hpandlou]

Sounds like it could be slate cleave...where the layers of slate start splitting apart. Got some on my floor that creak no grout cracking, took one out and it came away in layers.

That's a new thought! The grout is cracking across the floor, but none of the tiles have.
Thank you!

 

[Rob Z]

Hi, I don't know the products used on your project (except for the Dita), so I can't hazard a guess about any of that. You mentioned that all the expansion joints were in placed...what is the layout and placement of these joints? Could you post a diagram that shows where they were placed? What type were used? How wide? How deep? All the way around the perimeter, too?

A progressive loosening of tiles like the way you have described can sometimes be because of the shearing action across the floor when an installation has insufficient room for expansion and especially if it has additional stresses on it from heating, sunlight, etc.