Information on insulbrick
Edit/Add: 4/12/20 AM. A celotex/ fiber board, easily applied, was a big plus, to older homes, that had no wall insulation. At the very least, it inhibited the wind from blowing through the cracks, in a building. Still a lot out there, much has been sided over, with Aluminum, or vinyl. IMO Mike CT. Great modeling, Norm, thank you.