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So, based on my question here, I like the idea of insulating the inside of the toilet using Styrofoam because it seems more interesting/fun than installing a mixing valve. I plan to use silicone caulk to adhere the Styrofoam to the tank and fill the gaps/seams.

How thick should the Styrofoam be to properly insulate the tank and prevent condensation on the exterior?

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What is the water temperature, room air temperature, and nominal relative humidity? –  wallyk Dec 23 '13 at 16:24
    
Air temperature is about 70F-72F. Water is probably 55F. No idea on the humidity; the house doesn't have a dehumidifier (does have A/C, but that doesn't get run much in the Ohio winter). –  SpectralGhost Dec 23 '13 at 17:12
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