A couple of years back, we had to rebuild our rotten screened porch. Thanks to you wonderful folks, we used tongue-and-groove garapa from East Teak for the decking. We couldn't be happier with the screened porch.
Then last summer, I had the "brilliant" idea to put an Endless Pool under the screened porch and enclose it with sliders (so I can swim year-round - we're in Maryland). It seemed like a match made in heaven - an enclosed outdoor space that could get wet but would stay warm.
And then it got cold out. And the garapa - which my husband just adores - got to cupping. A lot. It's pretty bad.
Proposed solutions: 1) Paint the underside of the deck with drylok (but would there be water in the grooves?). 2) Plastic membrane under the boards that hold up the decking (would it get moldy in there?). 3) Dehumidifier running in the pool room.
Please help. My husband is devastated - he really loves the decking. FYI, the pool cover on the Endless Pool controls the humidity - it's only when the pool is in use that there's lots of water around. Also, the pool room will always be warmer than the air above the deck in the wintertime because there's 2,000 gallons of 80 degree water in there. Thanks!