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Why Polystyrene Insulation Shouldn't Be Used In Concrete Soffits
Thermoplastics soften and melt
Polystyrene products, such as expanded polystyrene (EPS) and extruded polystyrene (XPS) are considered thermoplastics. Thermoplastic materials soften and melt when heated and, as the pictures clearly show, can present a significant fire safety risk when installed in soffit applications.










