Hey everyone. I am renovationg my basement and am starting with my bathroom. I have gutted the bathroom, have finished my plumbing drainage and am now moving onto the framing. My question I have is, an air duct runs right through the bathroom (I know really poorly designed by the origional builder) and I was wondering if instead of using 2x4's if I could use 1x1's to build the bulkhead to save a bit of ceiling height.