Tiles coming up, cracks, and hollow points

To start With don’t pay. Personally I would of go around and pull up tiles randomly. They will all be same. Then get contractor in and let him pick some. Show him the bad work. So sorry you are in this situation
 
https://www.The Tile Association/services/technical-inspections/

blimey, at 120sqM of tiles this could get expensive. I will give them a call tomorrow but I presume I can't ask them to just inspect a small section of the floor area!

My customer's lawyer said that an expert opinion is an expert opinion, even if not from the Tile Association, so make of that what you will!
Agreed, it's expensive and I have my doubts about being able to reclaim those costs on a win.
 
take lots of photos, keep written records of everything, correspond by email.
I'd ask them for the fixing method they use, materials used, substrate material. If they are not forthcoming with this it will go in your favor if it goes to court.
the fixing method does not meet those set out in the British Standards for tiling, as you have pointed out not back buttered, not solid bed, there may well be others.
 
Hi, I’ve yet to read this thread unfortunately, but it has come to my attention that there a lot of calls to
‘Not pay’
Whilst this may be the action you are ultimately advised to carry out by a qualified professional, we are not authorised or qualified to encourage you to take this action.
These are opinions of individuals, and not the forum as an organisation.
Just want to make sure you are aware that we do not have the authority to instruct you to take that course of action.
Please take professional advice over payment.

Marc.
Admin.
 
Having now read all the posts, I can agree it’s a very unfortunate position that you find yourself in.
I’ll agree that in some images you have provided a laitance does seem present, if so it appears very unlikely that it has been removed prior to fixing.
On the subject of priming, it would normally be visible in some way.
If it was coloured, which many are, you would clearly see a coloured residue on top of the screed.
Even if it was white or clear, you would still see a clearly defined sheen to the top of the screed denoting priming had taken place.
Even after many months, this residue is apparent.
Moisture content could also be an issue to be looked at, was it moisture tested initially?
3 months holds no guarantee that it was devoid of moisture, that would also present in a way that you are showing from your images.
Was the property water tight before the screed installed?
The areas of the floor that appear completely devoid of adhesive where tiles have been lifted (tram lines only visible) could possibly denote incorrect preparation ie. adhesive unable to bond sufficiently to the substrate.
There is guess work here until you’re able to provide all relevant information.
The trouble with voids over ufh is that it can superheat the air in the voids and can pop the tiles from the adhesive, as I understand it anyway.
Typically there’s never ONE reason an install fails, it’s an accumulation of issues that ultimately leads to a catastrophic failure, which you do appear to be on the verge of.
One tile cracking is one thing, but numerous tiles in numerous places is something completely different, especially if it’s not in a straight line thro the line of an extension for example.
That’s more easily diagnosed as a shift in between new and old building works.
 
To help you as a consumer there is a video which depicts the way tiles should be installed produced by the NTCA (National Tile Contractors Association) in North America.



As a solution to your problem, it MAY be possible to resin inject your floor to save the rest.
But this is not guaranteed to be suitable repair for your particular installation. .
 
I had a company come up from Oxford to quote for resin injection on the floor here, the volume required made it more expensive than a complete re-tile!
I suppose you have to weigh it up against the overall disruption and risk of damage to the existing kitchen.
 

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