I live in Southern Oregon where Winter isn't terrible but it does get your attention. My shop (25 * 30) is insulated and I do keep the air temp around 60 deg. during the cold months. My problem is the concrete floor. Once my old feet get cold it seems to signal the end of the day in my shop. I've been planning on a wood floor by putting down treated 2/4 sleepers and then 2 layers (alternating) of 1/2" osb. Since I don't have a moisture problem with the floor, my question of the hour is: What should I use under the sleepers .. roofing tar paper or 10mill plastic sheet ?? What comes first, the moisture barrier and then the sleepers or the sleepers directly on the floor and then the moisture barrier directly under the osb layers ??
Thanks. Don in Medford