Product Description
Insulfoam® Residential Below‑Grade & Under‑Slab EPS Insulation delivers residential-grade expanded polystyrene panels designed for foundation walls, slab-on-grade, perimeter insulation, and under-slab thermal protection. These panels maintain stable R-value over time, resist moisture, and protect waterproofing systems during backfilling. Available in rigid board and R‑TECH® fan-fold formats at home improvement retailers.
Key Benefits
- Energy Savings: Proper below-grade insulation can reduce structural heat loss by up to 25%.
- R-Value Stability: EPS retains its R-value long-term, unlike XPS which degrades.
- Moisture Resistance: EPS absorbs less moisture and dries faster than XPS.
- Protects Waterproofing: Shields damp-proofing and waterproofing during backfilling.
- Easy Handling: Lightweight rigidboards and fan-fold options are homeowner-friendly.
Best For
- Under-slab insulation
- Foundation wall perimeter insulation
- Radiant heated slab systems
- Drainage board and perimeter barrier use
- Plaza deck and landscape void fill
- Basements and crawlspaces
Product Properties
| Property | Specification |
|---|---|
| Material | Expanded Polystyrene (EPS) |
| Presentation | Rigid board and R‑TECH® fan-fold |
| R-Value Stability | 100% of published R-value retained over time (no thermal drift) |
| Moisture Behavior | Low long-term absorption; dries faster than XPS-based products |
| Energy Code Impact | Reduces heating/cooling energy by mitigating heat loss through foundation |
| Availability | Home improvement stores—available as boards or fan-fold panels |
