I'm with Kevin, your wintertime RH is way too low. 30% is 6% MC. I can't even imagine what the RH is for 2%; I'm surprised you can even live in that w/o drying up like a prune. I would get a humidifier and keep the RH above 30%. You'll feel better and so will the wood.
FWIW, I mill and dry much of my own lumber. I take it out of my kiln at 7% and store it in a closed, unconditioned shed. It will go back up to 10 - 12%, depending upon the time of year, always about 2% lower than the outdoor EMC. So the KD wood you bought that measured 12% seems very reasonable to me. I bring wood into my conditioned shop which is now at 6% MC and gets up to 9% in the Summer, let it sit for a week or two when I can but admit it's often less, and put it to work. Never had an issue.
John
Reply With Quote