Hi Matt, Raff......that sounds ok in theory, but would run foul of the issue here, which I think is not the quality of the wood and how dry or not it was. It certainly looked like some of the best quality lumber I have seen supplied for floorboards in some time. The issue is primarily what would be reasonably expected of the installer to do, to prevent problems related to movement in the wood. I think we did pretty much all we could - we made sure the plaster was dry, we installed a de hum, to take the moisture out of the air from the screed, we waited as near as possible to the end of the job and the house had all the windows and doors fitted etc. Pretty much the last thing that happens in a refurb is the heating gets commissioned and turned on...rads are only hung on the wall or placed on the finished floor after decorating and oiling etc - very tricky to put that earlier into the schedule, for many reasons.
As has been stated, the wood is going to move, unless you kiln dry it somehow to the exact RH and dryness that it would be at, in the completed and centrally heated house, then somehow keep it thus and install in the house when the house is complete. Not easy or practical and probably not compatible with programs and the clients expectations.
Even if we had supplied the wood, we would have had the same problem - they were saying it was our fault it absorbed water after it had been dried ( we installed it before the house was properly dry) and also our fault as professional builders, because we should have known that would happen. We are of course aware of the potential issue, many jobs we do, we have to go back later and repaint all the cracks that have opened up where the skirtings and architraves meet the walls and frames etc. This is normal. My take is that is almost impossible to avoid this kind of issue, no matter how diligent you are.
Annyway, you live and learn, maybe I will right something into our preamble to point out potential issues like this ........ much of the problem is client expectations and managing these.
Cheers, Mark