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90mm PIR T&G Cavity Wall Sheet Part Fill - EcoTherm/Celotex/Unilin - 1200x450
90mm PIR T&G Cavity Wall Sheet Part Fill - EcoTherm/Celotex/Unilin - 1200x450

90mm PIR T&G Cavity Wall Sheet Part Fill - EcoTherm/Celotex/Unilin - 1200x450

  • Cavity Wall Insulation
  • EcoTherm

  • Free Next Day Delivery (over £500) in the West Midlands
  • Free Standard Delivery (over £500)
  • View our guides for Help & Advice
 (   Ex. VAT) £55.80
 - £540.00
All prices are including VAT

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🚛 Next Day Delivery (West Midlands) – FREE on orders over £500

These high-quality 90mm PIR insulation boards are specially designed to fit seamlessly into cavity walls, providing superior thermal resistance and reducing heat transfer. With a thickness of 90mm, it offers unrivalled insulation performance without compromising on space.  

The tongue and groove design of this 90mm PIR insulation ensures easy installation and allows for a perfect fit, ensuring that there are no gaps or weak spots in the insulation. And with dimensions of 1200x450, our 90mm PIR cavity insulation is perfect for a wide range of wall cavities. 


  • 90mm, 1200x450 (pack of 4)


    • Superior insulation performance  
    • Environmentally-friendly  
    • Tongue and groove design  
    • Thickness: 90mm  
    • Length: 1200mm  
    • Width: 450mm  
    • Easy installation 
    • Highly versatile  
    • Wall Sheet Part Fill 
    • Fire-resistant  
    • Moisture-resistant  

    DISCLAIMER: Please make sure this product meets fire safety regulations for your project. 

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    Frequently Asked Questions

    No, these 90mm PIR insulation boards are not fireproof. While they may have some fire-resistant properties, they are not designed to provide complete fire protection. To meet specific fire safety requirements, check out our KNAUF Fire Panel. 

    This 90mm cavity wall insulation is made of high-quality Polyisocyanurate (PIR) foam insulation material. PIR insulation is known for its excellent thermal resistance properties and durability. It is manufactured by combining isocyanates and polyols to create a rigid foam core, which is then faced with materials such as foil or other laminates to enhance its performance. This combination of materialsprovides effective insulation whilemaintaining a compact and lightweight profile, making it a popular choice for cavity wall insulation.

    These 90mm PIR insulation boards are specifically designed for cavity walls. They are suitable for use in residential and commercial construction projects where cavity wall insulation is required. They are engineered to provide excellent thermal resistance and are ideal for improving energy efficiency in buildings while maintaining a compact profile.

    Using these 90mm cavity wall insulation boards can significantly enhance your building's energy efficiency by reducing heat loss through cavity walls. This can lead to lower energy bills, improved thermal comfort, and reduced carbon emissions. Additionally, it can help meet building regulations and standards related to insulation and energy performance.

    Free shipping will automatically be applied to all orders over £500. Simply add over £500 to your cart and you will see the discount while checking out.

    Orders under £150 - £100 carriage.
    Under £300 - £50 charge.
    Under £500 - £25 charge.
    Over £500 is free.

    We typically deliver orders within 2-3 business days of ordering.

    Orders for the West Midlands will be completed in 1 to 2 working days.

    Orders for areas out of the West Midlands will be completed in 3 to 4 working days.

    Orders made after 5pm will be processed on the following working day.

    Our deliveries are typically made between 8am and 5pm, Monday - Friday excluding Bank Holidays (Great Britain).

    We are unable to offer timed deliveries.

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