What insulation do they use?

Our Sips Eco Panels use premium carbon treated Expanded Polystyrene (EPS) as the insulation which helps you achieve Part L of the updated building regulations and achieve very low u-values.  EPS achieves a BRE Green Guide rating of A+ (taking into account whole lifecycle impact) and is widely used throughout the construction industry as an insulant.  EPS is 98% air and is fully recyclable.