Rigid Insulation Board

We stock a wide range of rigid insulation board perfect for a variety of applications. Whether you're looking to insulate your loft or improve the thermal efficiency of your home, our selection of insulation board is sure to have what you need. We only stock the best brands in the business, so you can be confident you're getting a high quality product. We also offer free delivery on all eligible orders, so you can be sure you are getting the best possible deal.
Unilin Thin-R PIR 125mm x 2.4m x 1.2m
Unilin Thin-R PIR 125mm x 2.4m x 1.2m Floor Insulation
Regular price
from £58.39 £70.07
Sale price
from £58.39 £70.07
Regular price
Unit price
Sold out

Rigid insulation boards are an essential component in modern construction, known for their superior insulation properties and versatility in various applications. These boards are highly effective in reducing heat transfer, thereby enhancing energy efficiency in buildings. They come in various materials, sizes, and thicknesses, catering to different insulation needs and specific use cases.

Types of Rigid Insulation Boards

PIR (Polyisocyanurate) Boards

  • Overview: PIR boards, such as the Unilin Thin-R series, are known for their high thermal efficiency and strength-to-weight ratio. They are lightweight yet durable, making them ideal for both residential and commercial construction.
  • Applications: Commonly used in roof, wall, and floor insulation. Their rigid structure makes them suitable for use in a variety of building types, including new constructions and refurbishments.
  • Benefits: Offers excellent thermal performance with a thin profile, saving space while providing effective insulation. It is also resistant to moisture and mould, enhancing its durability.


Other Material Options

  • EPS (Expanded Polystyrene): Known for its versatility and affordability. Suitable for below-grade applications and can be used in walls and roofing.
  • XPS (Extruded Polystyrene): Offers higher density and moisture resistance than EPS. Ideal for demanding environments like basements and external wall systems.
  • Phenolic Foam: Provides exceptional fire performance and low smoke emission. It's a good choice for buildings where fire safety is a priority.


Choosing the Right Rigid Insulation Board


  • Thermal Performance: Assess the R-value (thermal resistance) needed for your project. Higher R-values mean better insulation.
  • Application Area: Determine where the insulation will be applied. Different materials suit different areas (e.g., roofs, walls, floors).
  • Building Regulations: Ensure compliance with local building codes and regulations regarding insulation and fire safety.
  • Environmental Impact: Consider eco-friendly options that offer recyclability or are made from sustainable materials.


Practical Use Cases

  • Residential Buildings: Opt for PIR boards like Unilin Thin-R for general home insulation due to their high thermal efficiency and space-saving design.
  • Commercial Projects: High-traffic areas may require insulation with higher durability and fire resistance, such as Phenolic foam boards.
  • Specialized Applications: For moisture-prone areas like basements, XPS or EPS boards are recommended due to their moisture-resistant properties.



Rigid insulation boards are a key element in achieving energy efficiency and comfort in buildings. The variety of materials available, such as PIR, EPS, XPS, and Phenolic foam, cater to a wide range of insulation needs. Consider factors like thermal performance, application area, and compliance with building regulations when selecting the right product for your project.

Read More
We use cookies to improve your user experience. View Privacy Policy