25mm Insulation Board


- Versatile Celotex GA4000 insulation boards for floors, walls, and roofs.
- Low emissivity foil face enhances thermal performance.
- Environmentally friendly, durable, lightweight, and easy to install with class 1 fire rating.
- Regular price
- £11.17£13.40
- Sale price
- £11.17 £13.40
Was £0.00Sold out


- Regular price
- £11.17£13.40
- Sale price
- £11.17 £13.40
Was £0.00Sold out


- Durable Celotex TB4000 Insulation Board
- Exceptional thermal conductivity (0.022W/mK)
- Cost-effective, strong, easy to install, and long-lasting
- Regular price
- £11.17£13.40
- Sale price
- £11.17 £13.40
Was £0.00Sold out


- Maximize Energy Efficiency: Thermal conductivity of 0.022 W/mK for reduced heat loss and lower bills.
- Compatibility with Underfloor Heating: Seamless integration for comfort and luxury without compromise.
- Cost Savings & Versatility: Lightweight, easy installation, and suitable for various floor types.
- Regular price
- £106.95£128.34
- Sale price
- £106.95 £128.34
Was £0.00Sold out


- Effortless insulation with Kingspan Thermapitch TP10.
- High density increases habitable space by up to 15%.
- Trusted foil-facing technology prevents moisture buildup.
- Regular price
- £106.95£128.34
- Sale price
- £106.95 £128.34
Was £0.00Sold out


- Regular price
- £76.50£91.80
- Sale price
- £76.50 £91.80
Was £0.00Sold out


- All-in-one Eco-versal Insulation Board for thermal conductivity (0.022 W/mK)
- Rigid PIR core with aluminum composite foil facing, perfect for roofs, walls, and floors
- Lightweight, easy to cut, and install compared to some other commonly used insulants; offers warmth and durability
- Regular price
- £11.17£13.40
- Sale price
- £11.17 £13.40
Was £0.00Sold out


- Superior rigid insulation: TW55 boasts low GWP, zero ODP, and a thermal conductivity of 0.022 W/m.K.
- User-friendly installation: Ideal for steel/timber frames, CFC/HCFC-free, and water vapor resistant.
- Long-lasting quality: Non-fibrous core, eco-conscious, and available in various sizes at Insulation4less.co.uk.
- Regular price
- £106.95£128.34
- Sale price
- £106.95 £128.34
Was £0.00Sold out


- Premium lower lambda insulation: Kingspan Kooltherm K103 Floorboard enhances flooring performance with fibre-free phenolic core.
- Durable construction: Glass tissue facings, autohesively bonded, ensure lasting quality and ease of installation.
- Trusted quality: Manufactured underquality standards for safety and reliability.
- Regular price
- £285.00£342.00
- Sale price
- £285.00 £342.00
Was £0.00Sold out


- Regular price
- £21.48£25.78
- Sale price
- £21.48 £25.78
Was £0.00Sold out


- Premium insulation board: Kingspan Thermaroof TR26
- Fibre-free phenolic core, ISO certified
- Size: 2.4 x 1.2m, 0.019 W/mK conductivity
- Regular price
- £245.20£294.24
- Sale price
- £245.20 £294.24
Was £0.00Sold out


- High-performance rigid polyisocyanurate insulation.
- Compatible with PVC single-ply waterproofing.
- Resistant to water vapor, solvents, fungi, and rodents.
- Regular price
- £0.00£0.00
- Sale price
- £0.00 £0.00
Was £0.00Sold out
Welcome to the 25mm Insulation Board category on Insulation4less! This specific thickness of insulation board is widely recognised for its effectiveness in various insulation applications across various construction and refurbishment projects. The 25mm insulation boards are meticulously crafted to balance physical properties and thermal performance.
CELOTEX Insulation Boards
Celotex boards, with options like the GA4000 and TB4025, serve as general-purpose insulation boards suitable for a multitude of applications such as floor, wall, and roof systems. Manufactured with PIR (Polyisocyanurate) technology, these boards are celebrated for their low thermal conductivity and firm structural integrity, making them a favoured choice in both residential and commercial settings.
KINGSPAN Insulation Solutions
Kingspan, a notable name in the insulation industry, provides various 25mm insulation boards tailored for specific areas and applications:
- Thermafloor TF70: Specifically designed for floor applications, ensuring stable thermal performance on ground floors and basements.
- Thermapitch TP10 and Kooltherm K107: Targeted for pitched roofs, these boards maintain a steady internal temperature by reducing heat loss through the roofing structure.
- Thermaroof TR27 and TR26: Ideal for flat roofs, providing robust, reliable, and enduring thermal insulation.
- Thermawall TW55: Suitable for steel and timber framed wall insulation, delivering consistent thermal resistance.
Kooltherm K103 Floorboard: A premium offering for floor insulation with exceptional thermal performance.
ECOTHERM Universal Boards
EcoTherm’s Eco-versal boards are versatile insulation boards applicable across walls, floors, and roofs. They bring along the benefit of being universally applicable and are also fabricated with PIR technology, ensuring optimal thermal efficiency.
ROCKWOOL Insulation Boards
Rockwool RWA45, made from mineral wool, provides a distinctive solution for thermal, acoustic, and fire insulation. It's known for its resilience and is applicable to a myriad of surfaces, including walls, floors, and roofs.
Practical Applications & Suitability
Each product within the 25mm insulation board category has unique characteristics that make it suitable for specific applications:
- Floor Insulation: Products such as Kingspan Thermafloor TF70 and Kooltherm K103 are crafted to minimise thermal bridges, thereby enhancing comfort and energy efficiency within spaces.
- Roof Insulation: Boards like Kingspan Thermapitch TP10 and Thermaroof TR27 are meticulously designed to offer maximum thermal performance for pitched and flat roofs respectively, ensuring enhanced thermal comfort.
- Wall Insulation: Solutions like the Celotex GA4000 and Kingspan Thermawall TW55, cater to diverse wall applications, providing a thermally efficient envelope to structures.
Universal Application: EcoTherm Eco-versal boards and Celotex TB4000 are practical options for varied applications, ensuring consistency in thermal performance across multiple areas of a building structure.
Guiding Your Selection
While choosing a 25mm insulation board, consider:
- Application Area: Ensure the product is designed for the intended application (floor, wall, roof).
- Thermal Performance: Check the thermal conductivity to ensure optimal thermal performance.
- Material: Understand the material (e.g., PIR, mineral wool) to leverage specific advantages like fire resistance or acoustic insulation.
- Budget: Opt for solutions that balance cost and performance, providing value for your investment.