Here's what I've run into:
Approx: 10 x 14 room.
Pulled up nasty old carpet & pad. Pulled up old tile and found 1/4" plywood subfloor over wood planking (planking is approx 5-1/2" wide, 3/4" thick of varying lengths). There are varying dips, valleys, humps, etc... Mostly due to the fact the...