hold on...we need waaaay more information then what you gave.

What is directly underneath the maple? the plastic then what? concrete? joists?

maple is very tempermental with moisture. did you house have climate control inside when the install was done?

Thanks, Gregmills_Gw, for the follow up: Directly under the maple is Dricore, underneath that is a water guard (silicon lining), and under that is a concrete slab. This is a 1st/ground floor, about 900 square feet, and in some areas it's just below grade (but not a lot). We purposely used the Dricore to deal with the humidity issue. I'm really hoping we don't have to tear the whole thing up--but the floor is cupping badly in certain areas. We air conditioned the whole environment (72 degrees) as a stop gap and cut the floor at the sides of the wall more to allow it to expand--and it looks better, has relaxed. But I hate AC and can't live with the idea that whenever it gets a little humid, 7 months of the year here, I've got to run for the AC so to "baby" my floors. Any "work-around" solutions or better understandings of the problem would be much appreciated.

Wood doesn't belong below grade. Or in a home that doesn't want to control humidity. Rip it out and put in vinyl.

Having wood floors, requires that you keep the house conditioned. It IS a living product, you have to care for it just like anything else thats alive. sounds weird, but i hope you get what im saying.

If the maintenance is too much then maybe wood wasnt the best choice. It sounds like you took the proper steps to ensure the success of having wood in such a climate which is good.

How long were the floors in before you noticed the cupping issue?

A few more questions i need. Is this solid Maple? or Engineered? and how was that installed? nailed to the dricore? glued? or is floating?

Solid maple; nailed.

on the time frame before cupping, maybe 2-3 days--tops. The problem is a lack of plywood subfloor over the dricore and the fact that the nails/fasteners likely penetrated the plastic dricore backing. The question now is what can be done about it--cooling the house forever to 70 degrees is not feasible. I've lived in plenty of hardwood-floor houses with no AC--and no problem.

How is the dricore adhered to the concrete? Is it snapped together? or was it glued or fastened?

My understanding is you're not suppose to nail into the dricore. its used more for a floating system floor. On the Dricore website, it doesnt mention solid hardwood can be used over it, it mentions engineered and laminate, etc. but not solid hardwood.

My guess is the Dricore is floating over the concrete, and then you have the maple nailed to it, and its causing an issue because the dricore wants to expand and its not able to freely with the maple fastened directly to it.

I can think of no reasonable remedy for your situation, other than starting anew.