How Does GPS Perform Compared to XPS and Poly ISO?

Halo Exterra foam board

What Is GPS? Graphite Polystyrene (GPS) is a type of polystyrene foam insulation and is the insulation material that forms the core of Halo’s Interra®, Exterra®, and Subterra® panels. GPS is basically Expanded Polystyrene (EPS) which is infused with graphite particles. These graphite particles reflect radiant heat as it moves through the insulation, thus slowing down heat transfer considerably. […]

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