I’m setting up lumber racks in a new location and I am concerned about the humidity level in the room. In my regular lumber rack location the humidity stays pretty consistent at 50%. In the new location it has been between 55% and 60%. Does anyone have any thoughts on the moisture content effect of the 10%+ increase in humidity?
In the main lumber racks poplar, etc. typically measure at around 9% to 11% moisture content after weeks or months of storage. In time I'll find out what the moisture content turns out to be in the new rack location, but it would be nice to hear what others have to say about this. I have a dehumidifier I can run in new rack space if needed.
(Architectural Woodworking Forum)
From contributor C:
I've included a link below that will display the search page in our Knowledge Base. If you search for "MC Relative Humidity" you'll find lots of good reading on this topic (as you'll see). I quickly scanned a couple articles, and found what is likely the salient info you're looking for (shown below). Hope this helps.
58-64 RH -11%
52-58 RH -10%MC
46-52 RH - 9% MC
39 -46 RH - 8% MC
32 -39 RH - 7% MC
25 -32 RH - 6% MC
As most homes and offices run about 38% RH (30% RH wintertime; 50% RH summertime), many people would target that same level for lumber storage so that the MC does not change after manufacturing.