Boards are 1-1/8" thick. Glue is Titebond III. Current measurement in
my shop is ~40% Rh and in the winter it was in the 20s but it has gone
higher in the past week. Wood was supposedly kiln dried but probably
sat in an open door barn for years. It sat in my shop for months
before planing and sat there for months after being planed and jointed
before I glued it up. I noticed a very slight crack weeks ago but just
noticed the big ones yesterday, along with the severe curling. It is
just sitting out on my work bench.
Stan