Foil backed plywood is the more efficient than spray. Here is one site but many use the same figures. http://www.atticfoil.com/install-questions/paint-vs-foil.html
It looks like the mason did a good job concerning the texture. But the color is way off. Unfortunatly its not easy to match new to old. The good news- Staining morter isnt hard to do if its not sealed ... read more