Owens Corning FOAMULAR® C-200 Extruded Polystyrene Rigid Insulation 24" x 96" x 3" (Butt Edge) It is a moisture-resistant, rigid foam insulation, which can be installed on interior or exterior of walls, foundation walls and under concrete floor slabs. With a thermal resistance of R-5 per inch of thickness, it will help you save money on energy bills. OC FOAMULAR® C-200 Extruded Polystyrene Rigid Insulation is lightweight, durable and impact-resistant, making it easy to handle, saw, cut and score. Long-term thermal resistance R-5 per inch of thickness Moisture-resistant 70% lower global warming potential** Achieves zero ozone depletion potential 100% recyclable, 20% recycled content GREENGUARD Certified SM