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Roof Insulation Boards

(42 products)

Ideal for insulating roofing during roof replacements or ahead of loft conversions, our range of Roof Insulation includes options for both flat roof insulation and pitched roof insulation. Choose from trusted branch names such as Celotex PIR Insulation and SuperFOIL.

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Why Choose Our Roof Insulation Boards?

Whether you're tackling a pitched roof renovation, flat roof upgrade, or complete loft conversion, our roof insulation boards provide the perfect balance of thermal efficiency, durability, and ease of installation. Each board in our collection has been rigorously tested to meet UK building regulations whilst delivering exceptional long-term performance in Britain's challenging climate.

Our premium PIR (Polyisocyanurate) boards from Celotex and Recticel represent the gold standard in roof insulation technology. With exceptional thermal conductivity values of just 0.022 W/m.K, these lightweight yet robust boards deliver superior thermal performance whilst requiring minimal installation thickness. The integrated foil facings enhance thermal efficiency in cavity applications, making them ideal for space-conscious roof installations.

Key Benefits:

  • Exceptional thermal performance in minimal thickness
  • Lightweight design for easy handling and installation
  • Excellent fire resistance properties (Euroclass F rating)
  • BBA certified for roof, wall, and floor applications
  • Simple cutting and fitting for DIY installations

SuperFOIL Multifoil Technology: Innovation Meets Efficiency

Experience next-generation insulation with our SuperFOIL multifoil systems, engineered to combine vapour barriers and radiant barriers within a single, efficient solution. These innovative products utilise multiple reflective layers to combat heat transfer through reflection, conduction, and convection, delivering impressive thermal performance whilst simplifying installation.

Unique Advantages:

  • Combines insulation, vapour barrier, and radiant barrier functions
  • Made from 40% recycled materials for environmental responsibility
  • No specialist tools required for installation
  • Achieves any desired U-value when combined with other systems
  • Compresses to minimal thickness for easy storage and handling

Expert Application Guidance

Pitched Roof Solutions

Perfect for traditional sloped roofing systems, our boards fit seamlessly between rafters or above roof decks. The low-profile design maximises internal space whilst meeting stringent thermal performance requirements.

Flat Roof Applications

Engineered to withstand weather exposure, our flat roof insulation boards deliver consistent thermal performance whilst providing excellent dimensional stability under varying temperature conditions.

Loft Conversion Projects

Transform unused loft spaces into comfortable, energy-efficient living areas with boards specifically designed to maximise thermal performance whilst maintaining crucial headroom.

Professional Support When You Need It

Our Nottingham-based technical team combines practical installation experience with comprehensive product knowledge to support every aspect of your roof insulation project. From initial specification through to completion, we're here to ensure your roof insulation boards deliver the exceptional performance your project deserves.

Ready to enhance your roof's thermal performance? Explore our complete range of premium roof insulation boards and discover why DIY enthusiasts and trade professionals across mainland UK trust DIY Building Supplies for their most demanding insulation projects.

Frequently Asked Questions

View our help & advice
What are Roof Insulation Boards?

Roof insulation boards are specially designed panels used to enhance the thermal performance of your roof by reducing heat loss and improving energy efficiency. Ideal for residential and commercial properties, these boards create a barrier that helps maintain indoor temperatures, reducing heating and cooling costs. At DIY Building Supplies, our roof insulation boards are made from high-quality materials, ensuring durability, excellent insulation performance, and ease of installation.

Why Choose Roof Insulation Boards?

Investing in roof insulation boards comes with numerous benefits, including:

  1. Improved Energy Efficiency: By minimizing heat loss, roof insulation boards reduce the need for excessive heating in winter and cooling in summer, leading to significant energy savings.
  2. Enhanced Comfort: These boards help regulate indoor temperatures, ensuring your living or working spaces remain comfortable year-round.
  3. Cost Savings: Lower energy consumption translates to reduced utility bills, making roof insulation boards a cost-effective solution for long-term savings.
  4. Environmental Benefits: By using less energy, you’re also reducing your carbon footprint, contributing to a more sustainable environment.
  5. Durability: Our roof insulation boards are built to last, providing long-term thermal performance and withstanding the rigors of various roofing systems.
Applications of Roof Insulation Boards

Roof insulation boards are versatile and can be used in a variety of applications, including:

  • Pitched Roofs: Perfect for improving the energy efficiency of sloped roofing systems.
  • Flat Roofs: Designed to withstand weather exposure and deliver consistent thermal performance.
  • Loft Insulation: Ideal for insulating loft spaces, turning them into more functional and energy-efficient areas.
  • Extensions and Renovations: Suitable for both new builds and retrofitting projects to enhance insulation.
Why Buy Roof Insulation from DIY Building Supplies?

At DIY Building Supplies, we pride ourselves on offering premium roof insulation boards that combine performance, affordability, and ease of installation. Our collection includes options for different roof types and insulation needs, ensuring you find the perfect solution for your project.

Transform your property’s energy efficiency and comfort with our high-quality roof insulation boards. Explore our range today and take the first step toward a more sustainable and cost-effective roofing solution!