Rmax® Below Grade is an energy-efficient thermal insulation and protection board composed of a polyisocyanurate (polyiso) foam core bonded to reinforced polymeric facers on each side. Polyiso’s closed-cell and closed matrix foam core, along with its durable facers, create a multi-layered defense against water absorption and protection during backfill, making it a great choice for below-grade applications.

Features

• Durable Facer, Added Protection: Rmax® Below Grade has a high-strength, water-shedding facer for added foundation protection.
• Achieves Thermal Performance: Higher R-value per inch compared to XPS & other insulation. Rmax® Below Grade meets requirements with a thinner profile.
• Resists Water Absorption: The closed-cell & closed matrix of Rmax® Below Grade foam board meets water absorption requirements, with less than 0.3% absorption.
• High Compressive Strength: With a 25 to 60 psi, Rmax® Below Grade resists pressures from soil loads that act on the foundation wall while maintaining superior thermal performance.

30 sq ft