Owens Cornings FOAMULAR NGX 250 Extruded Polystyrene (XPS) Scored Insulation has excellent moisture resistance thanks to its closed-cell structure. This feature makes it ideal for use in below-grade applications, where water resistance is critical for maintaining long-term insulation performance. The product performs well in freeze-thaw conditions, ensuring durability even in harsh climates. FOAMULAR NGX 250 also contains the additional benefit of being manufactured with a blowing agent formulation that delivers a 90% reduction to Global Warming Potential (100 years), including the complete elimination of HFC 134a.2