I'm located in the GA piedmont, and have been commissioned to build an outdoor (covered) table. What MC range should such a piece be designed for? My hunch is 12% to 20%, but I really have no scientific basis for this.
Consider a frame and panel that is subject to natural humidity and temp changes, as well as occasional blown rain. What would be your process for determining the range of movement? Rules of thumb are fine. We all know that wood moves. We can easily find out how much each species will move with specific changes in MC. I'm looking for the missing link; is there an easy way to estimate the range of MC that a piece will likely encounter?
(Furniture Making Forum)
From Contributor D:
I believe Hoadley's book "Understanding Wood" has EMC charts for North America. The FPL site should also have EMC charts. The question is, do the charts apply to exterior work, or indoor? My experience in the Midwest tells me that 11% is our exterior EMC.
Note that Burlington, VT ranges from 11.7% to 14.2% EMC.