What is the christen of the matter similar to foam board used to fashion walls? ...

Does anyone know the autograph of the flounder...
Answers:    If it is for insulation, (rigid foam insulation board) it is what Steve said. I think you may parsimonious drywall, commonly called Sheetrock, gypsum board, plasterboard or wall board. But, I am not sure what you are doing.
An attachment be added on to our LR....
It is high-ranking density foam. The most common brands are Owens-Corning (pink) and Dow (blue). Celotex, as okay as others, make foil-faced version of foam board, also.