Here is what I've got, a 10x20 woodframed building with aluminum siding and a metal roof. The metal roof is on top of osb sheathing. I do not foresee ever trying to heat or cool the work shop, winters aren't that bad in Ga and a good fan should knock off the edge in the summer. So that being said...I figured some simple fiberglass insulation might help some. Do you think I'd be wasting my time and money? Really no way to insulate the floors other than building them up and I'm not going to do that. I want to go ahead and put some walls up so now is the time to insulate if recommended, ceiling next. Any advise or ideas would be appreciated. Also, I used foilback osb for sheathing with the foil facing inwards, have read good reviews on the stuff and can already tell a difference between the old roof and the new roof as far as temp. I've never had any issues with the metal sweating since its not heated or cooled. Any advise or ideas would be appreciated. thanks.

Matt