Recticel Insulation Boards

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Recticel PIR Insulation boards are a PIR insulation board faced with a multilayer foil on each side - popular for use in a wide variety of use cases - particularly in roof, wall and flooring insulation. It is a lightweight and DIY-friendly insulation board which is easily cut to size and offers effective thermal insulation.

What is PIR Insulation?

Polyisocyanurate (PIR) insulation is a type of rigid foam insulation backed with a foil layer, that is renowned for its exceptional thermal performance. It is a strong and light type of foam that keeps structures warm by trapping air inside. PIR insulation is lightweight, durable, and offers excellent fire resistance and thermal insulating properties, making it a super DIY-friendly solution that can easily be cut to size to fit rafters, joists and stud walls, and used as Cavity Wall Insulation.

What Sizes Do Recticel Eurothane Insulation Boards Come in?

Our Recticel insulation boards all measure a standard size of - 2400mm x 1200mm, and are available in a variety of thicknesses to suit every size of floor, cavity or project such as:

25mm, 30mm, 40mm, 50mm, 60mm, 70mm, 75mm, 80mm, 90mm, 100mm, 120mm and 150mm.

The most popular sizes are 100mm Recticel, 50mm Recticel and 25mm Recticel. 

Recticel Eurothane Installation - How to Install

There are many different uses for PIR insulation, so the method to install your Recticel insulation may vary. However, generally Recticel is intended to fit the depth of the cavity. Cut  to fit the height and width required using a utility knife, or handsaw for thicker boards, to achieve a friction-fit  - meaning the boards should fit tightly and stay easily in place with no additional fixtures and fittings.

For precise installation instructions for your specific use case, it is recommended to consult your builder, architect or building inspector to ensure installation complies with building regulations. 

Recticel PIR Insulation Fire Rating

Recticel PIR boards are rated Euroclass F Reaction to Fire classification, according to BS EN 13501-1

Recticel PIR Insulation R-value

The R-Value of Recticel PIR Boards increases with the thickness of the board. The higher the R-Value, the greater the resistance of the board and therefore the more effective the thermal insulation. 

Recticel PIR boards have a thermal conductivity of 0.022 W/m.K.

R-Value (m².K/W)

  • 25mm  - 1.10 
  • 30mm - 1.35 
  • 40mm - 1.80
  • 50mm - 2.25
  • 60mm - 2.70
  • 70mm - 3.15
  • 75mm - 3.40
  • 80mm - 3.60
  • 90mm - 4.05
  • 100mm - 4.50
  • 120mm - 5.45
  • 150mm - 6.80

To calculate the U Value of your wall, you must consider the entire structure of the wall, including air gaps. A general formula for calculating the U-value:

U = 1 over R


U = U Value

R = The total thermal resistance of the building component, including all layers of materials and air gaps.

Recticel PIR Insulation Thermal Conductivity 

Recticel PIR boards have a thermal conductivity of 0.022 W/m.K.

Recticel PIR Insulation Moisture Resistance

Recticel boards are made of a closed-cell structure which means they do not specifically retain moisture, although they are not entirely waterproof.

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