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In most cases, your installation will probably in a zone with RH values between 40% and 45%. If the temperature of the building is between 75 and 85 degrees, the equilibrium moisture content of your wood should be between 7% and 8%. However, in some coastal areas, the average RH is in the 58% to 63% range.
We have found that the equilibrium moisture content (EMC) for gypsum board at 50% RH is 0.3%. Samples exposed to 80-85% RH equalize at 0.4-0.5%. At 90-95%, they equalize at 0.7-0.8% MC. At these high levels, wood equalizes at about 20%.