Retrofit insulation to keep barn w/ tin roof COOL?
I'm looking at a property that has a (potentially, with some work!) 2-stall barn with a tin roof. I've lived in the South long enough to know that in the summer, a barn with an uninsulated tin roof turns into a blast furnace and stays that way until well after midnight.
So: ideas for roof insulation I could conceivably retrofit that would keep the place cooler?
And specifically would the foam-on stuff be any use, or is that more designed to keep spaces warm??
The barn I boarded at that stayed the coolest in summer had what looked to me like pieces of styrofoam kind of balanced on the rafters, leaving a space between the rafters and the roof. That seemed to trap the hot air up there by the ceiling and keep it there.
This barn however does not have that option, or even (I think) enough room to get the old-fashioned pink insulation up, since the rafters are up way too close to the tin roofline.
I'd love to know some thoughts as to whether retrofit insulation of some kind in this barn would be a lost cause or not. Thanks!