Steel shop question

I would agree that spray in foam insulation is the way to go. Two years ago we had the shop at work done 6" on the ceilings and 4" on the walls. The difference both summer and winter have been tremendous. The building is 70x90 with 12'ft walls. I will look up how much it was tomorrow how much it was to give you an idea. The benefits are many and it has one over fiberglass that with a shop you are keeping your cars in that is really important. Mice will not nest in it. I have fiberglass in my garage and when I recently replaced the water pump in my Sebring I found a giant mouse nest made from the fiberglass under the intake manifold.