I installed 3" oak hardwood, and am now getting cupping.
I have had a flood in my home about 3 feet. I pulled all the old hard wood. The subfloor is 5' PLANKS WHICH I LEFT IN PLACE. What i did not do until now was put a moisture barrier over the sand/dirt in the crawl space. I also put insulation r19 with paper backing under the house in the bays(this was installed after the cupping) I am running fans
in the living area to try and dry the floors, any help is very much appreciated.