Is there such a thing as a HWF cupping guide that let you know what is acceptable cupping and what isn't. What I am looking for is a measurement to go by.

thanks in advance.

Zero is acceptable!!

Anything else and it is cupping.

It is either cupping or it isn't.

The bottom of the board is wetter then the top of the board. That is unacceptable.

Is this a new construction, or a remodel, where this concern exists?

Well, my friend, not quite. When using wide solid planks in 3/4", one should expect a small amount of cupping during the humid time of year as the wood will absorb moisture and expand. Since the fasteners have held it in place and it has nowhere else to go, it will slightly "cup" from pressure exerted of the sides. Too much prolonged high humidity and the boards may develope compression set. Of course, it is also preferrable to maintain a moderate humidity level, 45 to 50% RH. And even though I warn and tell my customers this, do you think they'd listen or care. NO! Instead, I get the phone calls." My floor looks funny. Can you come take a look?" So, to answer the question, Is cupping acceptable? Well, no! Is it avoidable? Yes! Will the customer take the necessary steps to ensure the floors don't cup? Problably not!

This is new construction (less than 2 years). we have had situation where the floor has cupped less than 1mm. To give you some backgournd I'm in Vancouver, BC, Canada which is in a rain forest (just north of Seattle) during the winter months we will get on average 4' of rain, therefore humidity is higher.

My question is, is there a guide from the a US or North American Flooring association that give some standard?

thank you.

How wide are the boards and is this over a crawl space / soil?

Humidity high outside but it is not inside, add a crawl space and the underside of the joists and subfloor has a higher MC then the top of your finshed flooring... It's possible.