Polyisocyanurate (PIR) board insulation has emerged as a top-tier solution for energy-efficient building envelopes, offering exceptional thermal performance and durability. As a closed-cell rigid foam insulation material, it’s widely specified in commercial roofing systems, wall assemblies, and industrial applications where superior R-value retention matters.

Why Choose Polyisocyanurate Insulation Boards?
- Industry-Leading Thermal Efficiency
With an R-value of 6.0-6.5 per inch (ASTM C518), PIR boards deliver 15-20% better thermal resistance than comparable polyurethane or XPS foam insulation. Their unique thermoset polymer structure minimizes heat transfer in both extreme cold and hot climates. - Enhanced Fire Safety
Featuring a Class A fire rating (ASTM E84), these insulation boards incorporate flame-retardant additives that resist ignition and limit smoke development – a critical advantage over traditional EPS insulation. - Moisture & Vapor Resistance
The closed-cell composition provides <0.5% water absorption (ASTM C272), making it ideal for roofing insulation and below-grade applications where condensation resistance is paramount. - Eco-Friendly Performance
Containing 25-30% recycled content and zero ozone-depleting agents, PIR complies with LEED v4.1 standards for sustainable building materials.
Key Applications of PIR Rigid Foam Boards
- Flat Roof Systems: 40% lighter than perlite-based roofs with seamless thermal bridging prevention
- Exterior Insulation Finish Systems (EIFS): Achieve Passive House certification with continuous insulation
- Refrigerated Warehouses: Maintain consistent temperatures with λ-value of 0.023 W/mK
- Metal Building Insulation: Pre-fabricated laminated boards with reinforced foil facers
Technical Specifications
Property | Value Range | Test Standard |
---|---|---|
Density | 30-45 kg/m³ | ASTM D1622 |
Compressive Strength | 150-250 kPa | ASTM D1621 |
Service Temperature | -50°C to +110°C | EN 1604 |
Thermal Aging | <2% thickness change | EN 1604 (70°C/90d) |
Competitive Advantages Over Alternative Insulation
- 28% Higher R-Value than extruded polystyrene (XPS) of same thickness
- 50% Lighter Weight versus phenolic foam boards
- 3x Faster Installation compared to fiberglass batt insulation
- Zero VOC Emissions unlike some spray polyurethane foams
Installation Best Practices
- Use ISO 9001-certified polyurethane adhesives for board-to-substrate bonding
- Stagger joints in multiple layers to eliminate air gaps
- Apply protective facers (foil/glass fiber) in high-moisture environments
- Maintain 6mm expansion gaps in temperatures below 5°C