We have a storage building that is used as a workshop, and would like to insulate it for the brutal Texas summers.
The walls are strand board (I think that's the correct name, no soffit vents.
Could we use the blue styrofoam panels you see at Home Depot, and would we have to create an airspace between the exterior wall and the insulating material?
We then plan to hang some kind of wood panels on the walls. The workshop has AC & heaters, and we have installed a second layer of plywood, padding and carpet in there.