Why are my wood floors cupping?
My new hickory solid wood floors are beginning to cup as soon it got hot and humid outside. I live in Southeast, LA and the house has a 3′ crawl space under it. I tried to research the proper insulation to use and I went with a sprayed open cell foam under the subfloor. I have tar paper between the floor and subfloor and I did have the floors adjusted to the home air conditions prior to installing it. I also verified that I had proper expansion room around the floor edges.
I’ve been told that air is condensing under my floor and that I should have put in either closed cell foam, or enclosed my crawl space. At this point both would be difficult and expensive to do, but if it controls the cupping I’ll consider it. Could my AC be pulling out too much humidity and therefore “drying” the upper surface of the floor? Maybe my attic vent is pulling out too much air and forcing up the outside humid air through my floor. No idea… At this point I’m lost. Any ideas?
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