Don't even really need that. Get you a roll of that bubble wrap insulation that has nickel foil on the back. Hang it on the bottom side of your rafters. I bet it dropped out shop temps 20 degrees in the summer
That is what I want to staple up HD has it 255 a roll, I need two rolls the issue is getting it on there it is 16' ceilings so really need to rent a high reach for a day. If I had the extra cash now would be good the shop is basically clean.