Source google image: https://www.generalinsulation.com/wp-content/uploads/2015/11/ClassA-XCi-polyisocyanurate-wall-insulation-panel.jpg
Insulation wall
Source google image: https://www.generalinsulation.com/wp-content/uploads/2015/11/ClassA-XCi-polyisocyanurate-wall-insulation-panel.jpg