Other types of foam sheathing, also called rigid foam board or “foam plastic insulating sheathing” (FPIS), include:
- Expanded Polystyrene (EPS) – this includes both standard white EPS, and graphite polystyrene (GPS). - ASTM C578
- Extruded Polystyrene (XPS) - ASTM C578
- Polyisocyanurate (Polyiso) - ASTM C1289
Source: Foam Sheathing Committee (FSC) - American Chemistry Council