I am looking for something to insulate the upper four feet of my basement shop other than the fiberglas insulation I presently use. I don't want to lose too much space in the shop to walls so I would like to find something that has a decent "R" value and isnt that thick. What types of methods are available? I have considered removing this insulation and just having the poured concrete walls but don't know how much effect that might have on my heating bill and comfort level.
Thanks in advance,
Blair Chesterton