d079b06a_on___Green_Home_Guide_by_USGBC__Application_Tips
[Material] Polystyrene–Extruded (XPS) Foam Insulation [Pros] * More moisture resistant than EPS * Typically no indoor air quality effects * Recyclable [Cons] * Most products still use HCFCs (but they are to be phased out by 2010) * Made from petrochemicals * Contains highly toxic HBCD brominated flame retardant and other toxins [Application Tips] 
Foam insulation boards. Appropriate for larger projects or new construction in areas with moderate to no moisture. Best for interior basement walls, beneath siding, attic ceilings or below grade.
Buyer’s Guide to Green Insulation - Green Home Guide by USGBC
Application Tips