My take on foundation. My personal experience and my opinions here.
I have always, until this year, bought from Th*rne.
I have never experienced any foundation of incorrect dimensions in their product.
This year a 'not small' order went to K*S. It was an order for more than one individual.
It was not delivered late December/early January 'because of the temperature' - fair enough.
I discerned no difference between the received material than some left from my previous supply (same thickness, similar colour, but different packaging -Th*rne has always been in sealed plastic bags, this was in open plastic bags). I was surprised that I noted no difference and actually made an enquiry by phone to K*S, after all the glowing references from this site. I was told then that there had been a 'bearing failure' in his machine and different rollers were in use but would back to the normal rollers shortly'.
I am a cynical B and drew my own interim inferences. I may later confirm or question the information, so far stored in my notes.
This was the first time ever that I have needed to trim any foundation. That said it was not a great deal, only a couple so far, and I did not check any dimensions. I was using 'Th*rne seconds' frames so the small difference could have been the frames, so any difference has not been checked out as frames or foundation (just not worth the bother at the time).
Dimensions, as I see it, are likely to be too large if very warm foundation has been stacked too high, or possibly the carrier has compressed the order by stacking heavy items on the boxes for a few days! My storage of foundation is about 5 packs high along a 'shelf' near to the ceiling in the hall. Never gets too hot, .
So, there you are folks, my experience of just two suppliers over a ten year period. I may comment further if I find anything relevent. Until then, as they say watch this space! Any comments you may have on the above would be appreciated - you can pm me in confidence.
Regards, RAB