While I have seen other topics addressing this issue, I have more questions. My flooring has over the past two years cupped badly. I have a warranty with the builder and an inspection was done in December. The report never appeared and so another inspection was done in June. I just got the report saying the cupping was the owner responsibility either due to cleaning or the temperature at which the home is maintained.
From what I have read, cupping is due to the wood being wetter on the underneath side than on the top side. So as long as the house if warm enough for the top of the wood, would it not be warm enough for the "rest" of the wood?
While I keep my house cooler than some in the Northwest, it rarely falls below 64 degrees. Is this too cool?
I contend that the moisture barrier between the crawl space and the floor must be inadequate for the property and the climate in the Western Washington.
I have been using Bona floor cleaner and do not let water stand on the floor. A few drops in my kitchen sink area does not account for the cupping in my eating area. Besides, the Bona floor cleaner was recommended to me and the first inspector said I had made a good choice. The second inspector just took pictures of the floor cleaner.
So my plan is to have an independent floor consultant inspect, but I don't want to waste my time or money if this is my fault for keeping my temperature lset lower at night, despite the fact the house is well enough insulated to keep the house no cooler than 64 degrees.

Temperature, in itself has little bearing on wood and its moisture content. Consider that in the winter, with below zero temperature, the humidity levels are much lower than in the summer when the temperature rises.
I really cannot speculate on what could be causing the cupping of your floors without an on-site inspection or a great deal more information.
Hire a professional inspector. His report, while unbiased; will certainly enable you to make corrective measures if it is related to your maintenance procedure, and clearly find the cause of the problem if it isn't something you have done or are doing.

As a guess, for what its worth, in your situation it DOES seem to be related to the crawl space. Perhaps inadequate vapour barrier, lack of ventilation, or other causes.

Good luck

What you need is to commission your own independent inspector, to come as an unbiased, tell it like it is, investigation.

You may be getting the royal shaft, and you may not, but you will never know for sure, unless you get someone that knows wood and has a wood science background, to give you that unbiased fact, not opinion.

Drainage around the property?

http://www.hardwoodinstaller.com/hardwo ... ontrol.htm

Here's a few questions for ya (have you been using a dehumidifier in the basement? Prior to putting the wood floors in? was there a moisture problem in the basement?Was it corrected before the wood floor was installed? is there insulation in the basement ceiling? was that insulation installed before moisture in the basement was corrected? As you can see the list could go on forever

The only way a wood floors cups is from gaining moisture after installation. This can come from many sources. It is never just a temperature issue. Whether it is your fault or the fault of the builder will depend on your warranty, where the moisture is coming from and why the moisture is present. If you want the floors fixed, you will most likely need an independent, professional inspection.