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I have a stack of around 100 2x10s that I want to use as decking for a ceiling over 6x8 purlins. They will be exposed to central heat and air so I assume I want them at 7 or 8 percent. I have them in a room with a humidifier set at 35% and 2 humidity testers put the room at 42%, Wood tester puts them at around 14% and they don't seem to be changing much over a few weeks. The room is not heated. Do I need to heat it? How long should I expect to get from 14 or 15 to 8%
You are not acclimating lumber, you are trying to kiln dry it. Of course you need heat.
Now I am at 90 degrees and 37 % humidity in the room.Think I am around 13 % with the boards if tester is accurate.
Dave, think of this like a clothes dryer. If you put the wet clothes in there without heat, it's going to take a really long time. Besides bringing up the heat, I think you may need to allow some of this warm moist air to escape so it can take the humidity away. If not, getting back to the dryer analogy, the vent hose is plugged up so the hot moist air isn't dumped outside.
Besides getting the MC down, I would certainly be thinking about milling T&G edges with maybe car-siding V edge to help hide the shrinkage.