Below Grade Rigid Applications
For exceptional, long-lasting performance in below grade applications, no EPS or XPS competitive product digs deeper than ThermalStar® X-Grade.® With its outstanding thermal and physical properties, durable ThermalStar X-Grade protects foundation walls during backfilling, while providing excellent insulating performance. Patent pending integrated termite resistance assures peace of mind.
Long-Lasting Thermal Performance
ThermalStar X-Grade has been proven to absorb minimal moisture. Also, unlike other insulation products, ThermalStar X-Grade is a “breathable” material. This breathability ensures long-term performance. In fact, a 15-year comparative study of actual field applications of below grade insulation confirms the R-value is retained.
Integrated Termite Resistance
Termites can do serious damage to untreated building materials. With ThermalStar X-Grade, a proven termiticide is integrated into the chemistry of the product and is not a surface coating. US building code requires that rigid foam demonstrate resistance against termite attack when used below grade. In many states, X-Grade is approved for this use — see ICC-ES Evaluation Report (.pdf).