How do I prevent condensation on my new open beam ceiling?
I am a general building contractor and built a custom single level home comprising of an open beam cathedral ceiling with 2×6 T&G sheathing under 4” Ridgid Foam insulation under 1/2” plywood sheathing under Mission Tile style roof. The air space between the T&G and the plywood is filled with rigid cellular foam insulation.
Building is located in a beach community in Southern California where temperatures are relatively mild between 65-80 degrees 80% of the year. The building has under floor duct work for both heating and A/C.
My problem is when the temperature exceeds 85 degrees the ceiling ridge beams start to sweat and drip.
I have installed a dehumidifier as part of the HVAC which consistently expels water into an outside drain.
Any suggestions to help with correcting this problem would be apppreciated.
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