2x4 treated subfloor "joists" spaced at 12" provides a 1 1/2" space that allows for air flow beneath the cedar floor. A 3/4" vent down both sides should help. This will also allow for drying if there is a water spill or leaky humidifier.



Rough cedar does not have exact milling and some of the T&G was a chore to firmly seat. Nothing that a block of wood and big hammer couldn't handle however.