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A Guide to Thermal Performance in HVAC and Building Applications
In HVAC systems and modern energy-saving construction, PIR foam board has become a leading choice due to its excellent thermal insulation properties. A key metric that determines its performance is the R-value. This article explains what the PIR insulation R value means, how it compares to other materials like polyurethane board insulation, and why it matters for energy-efficient buildings.
What Is R-Value in PIR?
The R-value is a measure of a material’s ability to resist heat flow. The higher the R-value, the better the thermal insulation. In HVAC applications, especially for ducting and panel systems, selecting insulation boards with high R-values helps minimize heat loss and improve overall energy efficiency.
PIR (Polyisocyanurate) insulation is one of the best-performing materials on the market today, outperforming many traditional insulation types in R-value per thickness.
Typical R-Values for PIR
Among rigid foam materials, PIR foam board offers one of the highest R-values per inch. Below is a reference chart of standard thicknesses and their approximate R-values:
| độ dày | Thermal Conductivity (λ) | R-Value (approx.) |
| 10mm | 0.020 W/m·K | R2.8 |
| 15mm | 0.020 W/m·K | R4.3 |
| 20mm | 0.020 W/m·K | R5.7 |
| 25mm | 0.020 W/m·K | R7.1 |
| 30mm | 0.020 W/m·K | R8.5 |
| 40mm | 0.020 W/m·K | R11.3 |
| 50mm | 0.020 W/m·K | R14.2 |
| 60mm | 0.020 W/m·K | R17.0 |
| 70mm | 0.020 W/m·K | R19.8 |
| 80mm | 0.020 W/m·K | R22.7 |
Note: The actual PIR insulation R value may vary depending on foam density, facing, and test conditions.
Key Factors Influencing PIR Insulation R Value
- Foam Core Density – Higher-density PIR improves resistance to heat transfer.
- Facing – Helps enhance overall thermal resistance and moisture control.
- Aging Performance – PIR maintains a more stable R-value over time than standard polyurethane board insulation.
- Closed-Cell Structure – Blocks moisture and vapor, keeping thermal performance consistent in humid environments.
PIR vs. Polyurethane and Other Insulation Materials
| Loại cách nhiệt | Typical R-value per inch |
| Tấm cách nhiệt PIR | R6.5–R7.2 |
| Tấm Polyurethane | R5.8–R6.3 |
| EPS Foam Board | R3.5–R4.0 |
| Mineral Wool Board | R3.7–R4.2 |
Compared to other thermal insulating board options, PIR insulation provides better performance with less material thickness, which is especially valuable in space-restricted areas such as HVAC ducts, ceilings, and wall systems.
Conclusion: Why Choose PIR Foam Board for High R-Value Projects?
When thermal efficiency, long-term durability, and lightweight structure are essential, PIR foam board stands out as a top-performing thermal insulating board. Its superior R-value, moisture resistance, and installation flexibility make it ideal for HVAC ductwork, roofing insulation, and energy-saving building applications.
✅ Available in 10mm–80mm thickness
✅ Durable facing for thermal and vapor control
✅ Suitable for commercial HVAC, roofing, and wall insulation systems
📩 Contact GFIDuct today for tailored recommendations on PIR insulation R value and system design support.
🌐 Visit GFIDuct to explore our complete range of polyurethane board insulation and PIR foam board solutions.
