Best Loft Insulation Boards of 2025

Last updated on 19/10/2025

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Most Relevant

Most Relevant

Best Choice

2400 x 1200 x 50mm Celotex GA4050 / Kingspan TP10 / TF70 / Ecotherm Ecoversal Foil Insulation (10)

2400 x 1200 x 50mm Celotex GA4050 / Kingspan TP10 / TF70 / Ecotherm Ecoversal Foil Insulation (10)

buildershop (uk) ltd

Why we love it

Versatile for roofs, floors, walls.
Delivery available for remote locations.
Quality assured, trusted brands supplied.

9.8

Exceptional

9.8

Exceptional

buildershop (uk) ltd

2400 x 1200 x 50mm Celotex GA4050 / Kingspan TP10 / TF70 / Ecotherm Ecoversal Foil Insulation (10)

Why we love it

Versatile for roofs, floors, walls.
Delivery available for remote locations.
Quality assured, trusted brands supplied.

Value for Money

2400 x 1200 x 25mm Celotex TB4025 / Kingspan TP10 / TF70 / Ecotherm Ecoversal Foil Insulation (10)

2400 x 1200 x 25mm Celotex TB4025 / Kingspan TP10 / TF70 / Ecotherm Ecoversal Foil Insulation (10)

buildershop (uk) ltd

18% Off

Why we love it

Adaptable to varying locations.
Effective for multiple surfaces.
Offers diverse insulation solutions.

2400 x 1200 x 25mm Celotex TB4025 / Kingspan TP10 / TF70 / Ecotherm Ecoversal Foil Insulation (10)

18% Off

Why we love it

Adaptable to varying locations.
Effective for multiple surfaces.
Offers diverse insulation solutions.

50mm PIR Insulation Board, 600mm x 1200mm, Pack of 4

50mm PIR Insulation Board, 600mm x 1200mm, Pack of 4

Generic

Why we love it

Reduces energy costs significantly.
Easy installation and handling.
Superior moisture resistance.

Main Highlights

Rigid Insulation: This 50mm PIR insulation board provides excellent thermal insulation properties to help reduce energy costs.
Versatile Application: Suitable for use in floors, walls, and roofs in new-build and renovation projects.
Easy Installation: Lightweight yet sturdy boards measure 600mm x 1200mm for convenient handling and installation.
Moisture Resistant: The closed-cell structure resists moisture ingress, ensuring long-lasting performance.
Pack Contents: Each pack contains 4 insulation boards, covering an area of 2.88m2

50mm PIR Insulation Board, 600mm x 1200mm, Pack of 4

Why we love it

Reduces energy costs significantly.
Easy installation and handling.
Superior moisture resistance.

Main Highlights

Rigid Insulation: This 50mm PIR insulation board provides excellent thermal insulation properties to help reduce energy costs.
Versatile Application: Suitable for use in floors, walls, and roofs in new-build and renovation projects.
Easy Installation: Lightweight yet sturdy boards measure 600mm x 1200mm for convenient handling and installation.
Moisture Resistant: The closed-cell structure resists moisture ingress, ensuring long-lasting performance.
Pack Contents: Each pack contains 4 insulation boards, covering an area of 2.88m2

50mm PIR Insulation Board, 400mm x 1200mm, Pack of 6

50mm PIR Insulation Board, 400mm x 1200mm, Pack of 6

Generic

Why we love it

Excellent thermal insulation properties.
Suitable for multiple applications.
Lightweight, easy to install.

Main Highlights

Rigid Insulation: This 50mm PIR insulation board provides excellent thermal insulation properties to help reduce energy costs.
Versatile Application: Suitable for use in floors, walls, and roofs in new-build and renovation projects.
Easy Installation: Lightweight yet sturdy boards measure 400mm x 1200mm for convenient handling and installation.
Moisture Resistant: The closed-cell structure resists moisture ingress, ensuring long-lasting performance.
Pack Contents: Each pack contains 6 insulation boards, covering an area of 2.88m2

50mm PIR Insulation Board, 400mm x 1200mm, Pack of 6

Why we love it

Excellent thermal insulation properties.
Suitable for multiple applications.
Lightweight, easy to install.

Main Highlights

Rigid Insulation: This 50mm PIR insulation board provides excellent thermal insulation properties to help reduce energy costs.
Versatile Application: Suitable for use in floors, walls, and roofs in new-build and renovation projects.
Easy Installation: Lightweight yet sturdy boards measure 400mm x 1200mm for convenient handling and installation.
Moisture Resistant: The closed-cell structure resists moisture ingress, ensuring long-lasting performance.
Pack Contents: Each pack contains 6 insulation boards, covering an area of 2.88m2

PIR Insulation Board 25mm - 400mm x 1200mm for use in Roofs, Walls and Floors (12)

PIR Insulation Board 25mm - 400mm x 1200mm for use in Roofs, Walls and Floors (12)

Generic

Why we love it

Reduces energy costs effectively.
Perfect for multiple applications.
Lightweight for easy installation.

Main Highlights

Rigid Insulation: This 25mm PIR insulation board provides excellent thermal insulation properties to help reduce energy costs.
Versatile Application: Suitable for use in floors, walls, and roofs in new-build and renovation projects.
Easy Installation: Lightweight yet sturdy boards measure 400mm x 1200mm for convenient handling and installation.
Moisture Resistant: The closed-cell structure resists moisture ingress, ensuring long-lasting performance.
Pack Contents: Each pack contains 6 insulation boards, covering an area of 2.88m2

PIR Insulation Board 25mm - 400mm x 1200mm for use in Roofs, Walls and Floors (12)

Why we love it

Reduces energy costs effectively.
Perfect for multiple applications.
Lightweight for easy installation.

Main Highlights

Rigid Insulation: This 25mm PIR insulation board provides excellent thermal insulation properties to help reduce energy costs.
Versatile Application: Suitable for use in floors, walls, and roofs in new-build and renovation projects.
Easy Installation: Lightweight yet sturdy boards measure 400mm x 1200mm for convenient handling and installation.
Moisture Resistant: The closed-cell structure resists moisture ingress, ensuring long-lasting performance.
Pack Contents: Each pack contains 6 insulation boards, covering an area of 2.88m2

100mm PIR Insulation Board, 600mm x 1200mm, Pack of 4

100mm PIR Insulation Board, 600mm x 1200mm, Pack of 4

Generic

Why we love it

Excellent thermal insulation properties.
Versatile for multiple applications.
Easy and convenient installation.

Main Highlights

Rigid Insulation: This 100mm PIR insulation board provides excellent thermal insulation properties to help reduce energy costs.
Versatile Application: Suitable for use in floors, walls, and roofs in new-build and renovation projects.
Easy Installation: Lightweight yet sturdy boards measure 600mm x 1200mm for convenient handling and installation.
Moisture Resistant: The closed-cell structure resists moisture ingress, ensuring long-lasting performance.
Pack Contents: Each pack contains 4 insulation boards, covering an area of 2.88m2

100mm PIR Insulation Board, 600mm x 1200mm, Pack of 4

Why we love it

Excellent thermal insulation properties.
Versatile for multiple applications.
Easy and convenient installation.

Main Highlights

Rigid Insulation: This 100mm PIR insulation board provides excellent thermal insulation properties to help reduce energy costs.
Versatile Application: Suitable for use in floors, walls, and roofs in new-build and renovation projects.
Easy Installation: Lightweight yet sturdy boards measure 600mm x 1200mm for convenient handling and installation.
Moisture Resistant: The closed-cell structure resists moisture ingress, ensuring long-lasting performance.
Pack Contents: Each pack contains 4 insulation boards, covering an area of 2.88m2

XPS Foam Insulation Boards 1200 x 600 x 10mm - Electric and Water Underfloor Heating Tile Laminate Underlay Thermal Extruded Polystyrene Insulation Sheets (10, 1200 x 600 x 10mm)

XPS Foam Insulation Boards 1200 x 600 x 10mm - Electric and Water Underfloor Heating Tile Laminate Underlay Thermal Extruded Polystyrene Insulation Sheets (10, 1200 x 600 x 10mm)

Cosyspace

Why we love it

Highly efficient insulation for underfloor heating.
Light, dense and cost-effective solution.
Water-resistant, anti-aging, compressible, and recyclable.

Main Highlights

Best Used With An Underfloor Heating Kit On Concrete Flooring a Low Cost Proxy To Tile Backer Board
High Density, Light Weight And Low Cost Make This Foam Board Ideal In A Poorly Insulated Property
XPS Boards Are An Extruded Polystyrene Insulation Board Made Through A Plastic Extrusion Process
Widely Used In Walls And Loft Insulation, Underfloor Heating, Roof, Wet Room, And Non Moisture Areas
Stable Performance, Anti-ageing, Resistant To Compression, Water Resistant, Lightweight, Recyclable

XPS Foam Insulation Boards 1200 x 600 x 10mm - Electric and Water Underfloor Heating Tile Laminate Underlay Thermal Extruded Polystyrene Insulation Sheets (10, 1200 x 600 x 10mm)

Why we love it

Highly efficient insulation for underfloor heating.
Light, dense and cost-effective solution.
Water-resistant, anti-aging, compressible, and recyclable.

Main Highlights

Best Used With An Underfloor Heating Kit On Concrete Flooring a Low Cost Proxy To Tile Backer Board
High Density, Light Weight And Low Cost Make This Foam Board Ideal In A Poorly Insulated Property
XPS Boards Are An Extruded Polystyrene Insulation Board Made Through A Plastic Extrusion Process
Widely Used In Walls And Loft Insulation, Underfloor Heating, Roof, Wet Room, And Non Moisture Areas
Stable Performance, Anti-ageing, Resistant To Compression, Water Resistant, Lightweight, Recyclable

40mm PIR Insulation Board, 400mm x 1200mm, Pack of 6

40mm PIR Insulation Board, 400mm x 1200mm, Pack of 6

Generic

Why we love it

Excellent energy cost savings.
Versatile for multiple projects.
Lightweight and easy to handle.

Main Highlights

Rigid Insulation: This 40mm PIR insulation board provides excellent thermal insulation properties to help reduce energy costs.
Versatile Application: Suitable for use in floors, walls, and roofs in new-build and renovation projects.
Easy Installation: Lightweight yet sturdy boards measure 400mm x 1200mm for convenient handling and installation.
Moisture Resistant: The closed-cell structure resists moisture ingress, ensuring long-lasting performance.
Pack Contents: Each pack contains 6 insulation boards, covering an area of 2.88m2

40mm PIR Insulation Board, 400mm x 1200mm, Pack of 6

Why we love it

Excellent energy cost savings.
Versatile for multiple projects.
Lightweight and easy to handle.

Main Highlights

Rigid Insulation: This 40mm PIR insulation board provides excellent thermal insulation properties to help reduce energy costs.
Versatile Application: Suitable for use in floors, walls, and roofs in new-build and renovation projects.
Easy Installation: Lightweight yet sturdy boards measure 400mm x 1200mm for convenient handling and installation.
Moisture Resistant: The closed-cell structure resists moisture ingress, ensuring long-lasting performance.
Pack Contents: Each pack contains 6 insulation boards, covering an area of 2.88m2

Knauf Earthwool DriTherm Cavity Insulation Slab 37 – 50mm x 455mm x 1200mm (6.55 SQ/M per Pack)

Knauf Earthwool DriTherm Cavity Insulation Slab 37 – 50mm x 455mm x 1200mm (6.55 SQ/M per Pack)

Knauf

Why we love it

Excellent thermal performance guaranteed.
Easy and quick installation process.
BBA approved for all zones.

Main Highlights

Knauf Earthwool DriTherm Cavity Sheet 37-50mm (6.55m²/M Per Pack)
50mm Thick Hollow Wall Insulation - 6.55m2/m per pack. Easy and quick installation excellent thermal performance
BBA approved for use in all exposure zones. Made with a water repellent additive.
Non-flammable A1 Euroclass response to fire classification.

Knauf Earthwool DriTherm Cavity Insulation Slab 37 – 50mm x 455mm x 1200mm (6.55 SQ/M per Pack)

Why we love it

Excellent thermal performance guaranteed.
Easy and quick installation process.
BBA approved for all zones.

Main Highlights

Knauf Earthwool DriTherm Cavity Sheet 37-50mm (6.55m²/M Per Pack)
50mm Thick Hollow Wall Insulation - 6.55m2/m per pack. Easy and quick installation excellent thermal performance
BBA approved for use in all exposure zones. Made with a water repellent additive.
Non-flammable A1 Euroclass response to fire classification.

YBS Essentials Loft Wrap Bubble Foil Insulation Roll | 400mm x 20m, 3.5mm Thickness | DIY 3-in-1 Thermal Reflective Insulation

YBS Essentials Loft Wrap Bubble Foil Insulation Roll | 400mm x 20m, 3.5mm Thickness | DIY 3-in-1 Thermal Reflective Insulation

YBS Insulation

Free Shipping

Why we love it

Quality British-made insulation.
Maintains warmth and coolness.
Controls moisture and condensation.

Main Highlights

🇬🇧 QUALITY INSULATION, BRITISH MADE: Insulation foil roll crafted with pride in the UK by the leading reflective insulation manufacturer YBS Insulation. Size: 400mm x 20m, 3.5mm Thickness
🌟 THERMAL REFLECTIVE INSULATION FOR THERMAL EFFICIENCY: Highly reflective material retains heat, offering warmth in winter and coolness in summer
💧VAPOUR CONTROL LAYER FOR MOISTURE CONTROL: Prevents moisture and reduces risk of condensation, making it ideal for loft insulation applications
🔄 BUBBLE INSULATION ROLL THAT IS VERSATILE & USER-FRIENDLY: A thin, flexible, and lightweight design simplifies installation
🛡️ YEAR-ROUND PROTECTION: Provides robust protection against cold, heat, and UV light while preventing penetrating damp

YBS Essentials Loft Wrap Bubble Foil Insulation Roll | 400mm x 20m, 3.5mm Thickness | DIY 3-in-1 Thermal Reflective Insulation

Free Shipping

Why we love it

Quality British-made insulation.
Maintains warmth and coolness.
Controls moisture and condensation.

Main Highlights

🇬🇧 QUALITY INSULATION, BRITISH MADE: Insulation foil roll crafted with pride in the UK by the leading reflective insulation manufacturer YBS Insulation. Size: 400mm x 20m, 3.5mm Thickness
🌟 THERMAL REFLECTIVE INSULATION FOR THERMAL EFFICIENCY: Highly reflective material retains heat, offering warmth in winter and coolness in summer
💧VAPOUR CONTROL LAYER FOR MOISTURE CONTROL: Prevents moisture and reduces risk of condensation, making it ideal for loft insulation applications
🔄 BUBBLE INSULATION ROLL THAT IS VERSATILE & USER-FRIENDLY: A thin, flexible, and lightweight design simplifies installation
🛡️ YEAR-ROUND PROTECTION: Provides robust protection against cold, heat, and UV light while preventing penetrating damp

We scanned 543 products

We reviewed these offers relevant to the Loft Insulation Boards within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like buildershop (uk) ltd, Generic, Cosyspace, Knauf, YBS Insulation, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Loft Insulation Boards in the market, we considered we took a deep dive into 2716 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is 2400 x 1200 x 50mm Celotex GA4050 / Kingspan TP10 / TF70 / Ecotherm Ecoversal Foil Insulation (10). We love many things about this product by buildershop (uk) ltd. What sets it apart from the competition is Versatile for roofs, floors, walls. , Delivery available for remote locations. , Quality assured, trusted brands supplied.
The best value product for most shoppers and where user satisfaction is continuously the highest is 2400 x 1200 x 25mm Celotex TB4025 / Kingspan TP10 / TF70 / Ecotherm Ecoversal Foil Insulation (10) by buildershop (uk) ltd based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Loft Insulation Boards and the best cost-to-value ratio is 2400 x 1200 x 25mm Celotex TB4025 / Kingspan TP10 / TF70 / Ecotherm Ecoversal Foil Insulation (10)at buildershop (uk) ltd with a 18% discount.
Our list of the best Loft Insulation Boards is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.