Perimeter, Below-Grade, & Underslab Insulation

Expanded Polystyrene (EPS)


With up to 50 percent of a building’s total heat loss occurring at the perimeter and slab of the foundation, below-grade insulation is crucial to achieving energy efficiency. Perimeter, Below-Grade, and Underslab EPS Insulation is a proven and effective method of conserving heat energy in cold climates and air conditioning energy in warm climates.

EPS’s high R-Value, termite resistance, protection against backfill and expansive soils makes it the preferred below-grade insulation among contractors, architects and homeowners.

Types of Perimeter, Below-Grade & Underslab Insulation

Foam-Control® Plus+®:  An unfaced architectural grade rigid foam insulation with high compressive strengths, high R-values and moisture resistance.  Available in 4' x 8' sheets in 15, 25, 40, & 60 psi strengths.  Used in perimeter, below-grade and underslab applications.

Polar-R® Below-Grade Insulation: Film faced EPS for superior moisture resistance and protection against backfill. Available in 4' x 8' sheets.  Used in perimeter, below-grade and underslab applications when a film faced insulation is required.

Polar Fold® Protection Board: Film faced EPS for superior moisture resistance and protection against backfill. Available in 4’ x 50’ fan fold sheets.  Used in perimeter, below-grade and underslab applications when a larger sheets of film faced insulation is required.