I recently built an outdoor play set for my kids using ACQ-treated
pine. The wood was a bit damp when I built the play set, and I
expected a bit of shrinkage. I've been checking the tightness of the
carriage bolts about every other week.
I've found on 3 occasions, the bolts felt surprisingly loose, and
required one or more turns of the nuts to tighten.
I'm surprised how much the wood is shrinking. How long can I expect
this to go on? Will the wood eventually reach a stable point? Or will
this be a constant battle?