My Greenhouse has been an issue for some time. My first roof was a for now 1/2 inch ply with plastic over it but with 80 % humidity over the cold winters it did over time rot and separate. I replaced the roof with a new ply wood roof, shingle, insulation, vapour barrier, and need a ceiling for the inside. I am looking for advice and direction please. I have a 300 Gallon IBC 50 Tilapia in side…