Insulation and soundproofing
Rigid insulation panels: which ones to use for different applications
...EPS - Expanded polystyrene foam insulation boards:
Rated at R4 per inch; EPS foam insulation boards are more permeable to air and moisture than XPS, but it doesn't retain moisture to the same extent because of it's more closed cell structure and it's breathability which lets it dry out. Two inches of EPS foam board ha...