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Discover the Benefits of PIR Insulation Boards for Flat Roofs

  • Writer: Steve Lloyd
    Steve Lloyd
  • Aug 7, 2025
  • 2 min read

When it comes to constructing or refurbishing a flat roof, choosing the right insulation is key to ensuring performance, compliance, and energy efficiency. All Roofbase branches hold stock PIR insulation boards designed to suit a variety of flat roofing systems.


What is PIR Insulation? 


PIR is a foam board insulation material recognised for delivering excellent thermal efficiency. It's production involves a chemical reaction between a polyol and an isocyanate, which results in a rigid foam structure. This material is notable for its high thermal resistance, low water absorption, and high structural strength. The fine cell structure and closed-cell makeup of PIR enhances its ability to retain heat and resist moisture. 


Key Advantages of PIR Insulation Boards 


High Thermal Efficiency: PIR boards offer outstanding insulating properties, helping you achieve current Building Regulations for thermal performance. This helps to achieve lower energy costs and a more comfortable internal environment year-round. 


Lightweight & Easy to Install: The rigid, lightweight nature of PIR makes it simple to handle, cut, and fit, helping to speed up installation, and minimise disruption on site. 


Moisture Resistance: PIR's resistance to water absorption reduces the risk of mould and water damage. 


Versatile Application: Roofbase stocks PIR insulation boards for use with torch-on, self-adhesive and pour and roll bituminous membranes.

 

Regulation Compliant Thicknesses: Our insulation boards are available in a range of thicknesses to meet the requirements of current Building Regulations.  


Ideal Applications for PIR Insulation 


PIR insulation boards are suitable for a wide range of roofing projects, including: 

New build flat and pitched roofs 

Refurbishment projects 

Warm roof systems  


How Roofbase Can Help 


Roofbase stocks a wide selection of PIR insulation boards designed for use with torch-on, self-adhesive, and pour and roll bituminous membranes. Our extensive range is available in thicknesses that comply with current Building Regulations, ensuring you can choose the ideal PIR insulation boards to suit your flat roofing project. 

 

If you’re planning a flat roof project and want to ensure it’s insulated to the highest standard, contact your local Roofbase branch today.

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