For an underground house of Oehler design, can anyone give me an approximate final moisture content of the walls that are in close proximity to the backfill? I need to know so I can check the MC of the planks prior to installation to see if I'll have a shrinkage or expansion issue or preferably, no issue at all. The information should be available in the Permanent Wood Foundation manual you can download but I can't seem to find it anywhere.
It's pretty well packed with good stuff. Here's a quote:
"Wood used inside of homes as finished trim, cabinets and flooring, should be installed at a MC close to 8%. Wood used in exterior applications is a different story – it depends on where you live. In New England 14% MC is a good target. In Tucson, a 6% MC would be a better mark. The USDA Forest Products Laboratory in Madison has a pamphlet (FPL-RN-0268) listing outdoor EMC’s for about 350 cities worldwide."
As with almost all things in building, the answer depends, but I've attached the FPL-RN-0268 pamphlet and the link is: