pur insulation

PUR insulation and PIR insulation are both types of rigid foam insulation derived from polyurethane. They share some similarities, but there are also key differences in their chemical composition, manufacturing process, and performance characteristics. Understanding these differences can help you choose the best insulation material for your specific needs.

What is PUR Insulation?

PUR stands for polyurethane. It is a versatile plastic material used in various applications, including insulation. PUR insulation is created by mixing two liquid components, a polyol and an isocyanate, which react to form a rigid foam. This foam has a predominantly closed-cell structure, meaning it is composed of tiny cells filled with gas that resist heat transfer.

What is PIR Insulation?

PIR stands for polyisocyanurate. It is a modified version of PUR with enhanced properties. PIR insulation is also created by mixing a polyol and an isocyanate, but with a higher proportion of isocyanate and the addition of a catalyst. This results in a more thermally stable and flame-resistant foam compared to PUR.

Key Differences Between PUR and PIR Insulation

  • Chemical Composition: PIR insulation has a higher isocyanate content and includes a catalyst, leading to a more cross-linked and thermally stable chemical structure compared to PUR insulation.
  • Thermal Performance: While both offer good thermal insulation, PIR insulation generally has a slightly higher R-value per inch than PUR. This means PIR insulation can achieve the same level of thermal resistance with a thinner profile.
  • Fire Resistance: PIR insulation typically exhibits better fire performance than PUR insulation. It has a higher fire rating and tends to produce less smoke and toxic fumes in the event of a fire.
  • Cost: PUR is typically less expensive than PIR insulation due to the lower cost of raw materials and the simpler manufacturing process.

Benefits of PUR Insulation

  • Cost-Effectiveness: PUR is a more budget-friendly option compared to PIR insulation.
  • Versatility: PUR is used in a wide range of applications, including insulated metal panels, wall cavities, and insulated plasterboard.
  • Good Thermal Performance: While not as high as PIR, PUR still offers good thermal resistance and can contribute to energy savings.

Benefits of PIR Insulation

  • Superior Thermal Performance: PIR insulation provides excellent thermal efficiency, helping to achieve higher R-values and reduce energy consumption.
  • Enhanced Fire Safety: PIR insulation offers better fire resistance, contributing to a safer building environment.
  • Moisture Resistance: Like PUR insulation, PIR insulation is also resistant to moisture, preventing dampness and condensation.

Applications of PUR and PIR Insulation

Both PUR and PIR insulation are used in various applications, including:

  • Insulated Metal Panels: Used as the core insulating material in insulated metal panels for walls and roofs.
  • Wall Cavities: Installed in wall cavities to improve thermal performance and reduce heat loss.
  • Insulated Plasterboard: Bonded to plasterboard to create thermal laminate boards for internal wall insulation.
  • Flat Roofs: Used in flat roof insulation systems to provide thermal and moisture protection.
  • Pitched Roofs: Installed between and over rafters in pitched roofs to improve energy efficiency.

Choosing Between PUR and PIR Insulation

The choice between PUR and PIR insulation depends on your specific needs and priorities. If budget is a primary concern and fire resistance is not critical, PUR can be a suitable option. However, if you require higher thermal performance and enhanced fire safety, PIR insulation is the preferred choice.

Factors to consider when choosing:

  • Required R-value: Determine the level of thermal resistance needed for your application.
  • Fire safety requirements: Consider the fire rating requirements for your building project.
  • Budget: Evaluate the cost-effectiveness of each option.
  • Application: Choose the type of insulation that is most suitable for your specific application.

Need help choosing the right insulation for your project? Contact Online Insulation today for expert advice.