Many thanks for your patience. Whilst the inspector’s report may be relied on by the customer in arguing their case, ideally you would need something from the manufacturer as they would know best what may damage the floor and what could potentially cause its lifting.
One thing is certain though – the customer can claim whatever he wants, but the only way to make you liable and to try and make you pay is to take you to court and convince them that the issues were as a result of your fitting rather than anything else. This is where they would have to rely on some more expert evidence and where you can use a relevant report yourself, such as getting the manufacturer’s opinion
So for the time being you cannot be forced to do anything. So far you are only answering a request by the customer to fix this and regardless of what they say or want, you do not have to do anything. Do not give them ideas about what they should do next, like going to court, but state that unless you are ordered by an official third party that this is as a result of your work, you will not be liable for any repairs or replacements.
I hope this has answered your query. I would be grateful if you could please take a second to leave a positive rating by selecting 3, 4 or 5 stars - this is an important part of our process and recognises the time I have spent assisting you. If you still need me to clarify anything else, please get back to me on here and I will assist further as best as I can. Thank you