Insulation Board 120mm


- 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
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- Regular price
- £35.90£43.08
- Sale price
- £35.90 £43.08
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- Environmental-friendly PIR insulation board with foil facings
- High thermal conductivity (0.022W/mK) eliminates cold spots, reduces energy usage, and lowers bills
- Certified with A+ rating, BBA certificates, and meets Building Regulations; easy to install, strong, and long-lasting
- Regular price
- £35.90£43.08
- Sale price
- £35.90 £43.08
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- Regular price
- £76.50£91.80
- Sale price
- £76.50 £91.80
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- 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
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- £0.00 £0.00
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We're sorry to inform you that we no longer supply the Ballytherm 2.4m x 1.2m insulation product. However, we have several other high quality alternatives to meet your insulation needs.
Thank you for choosing Insulation4Less for your insulation needs. If you have any questions or need further assistance, feel free to contact our customer support team.
- Regular price
- £16.20£19.44
- Sale price
- £16.20 £19.44
Was £0.00Sold out


- Eurothane® Eurodeck is a thermal insulation board designed for use in warm flat roofs under mechanically fixed single-ply membrane waterproofing systems.
- It offers high compressive strength, excellent dimensional stability, and compatibility with numerous waterproofing systems.
- The board is faced on both sides with a multi-layer coated aluminum foil, ensuring optimum performance in both new build and refurbishment projects.
- Regular price
- £0.00£0.00
- Sale price
- £0.00 £0.00
Was £0.00Sold out

- Regular price
- £35.90£43.08
- Sale price
- £35.90 £43.08
Was £0.00Sold out


- Efficient insulation: Thermal conductivity of 0.034 W/mK
- Universal approval: A1 Euroclass certification
- Certified quality: BBA Certificate 20/5845, BS 8414-2:2015 + A1:2017 tested
- Regular price
- £57.38£68.86
- Sale price
- £57.38 £68.86
Was £0.00Sold out
When it comes to achieving optimal thermal performance in buildings, the 120mm Insulation Board category unveils a plethora of options tailored to meet various insulation requirements. Brands like Celotex, Kingspan, Ballytherm, Recticel, Unilin, and others present here have painstakingly developed insulation boards that provide exemplary thermal conductivity, ensuring your structures are energy-efficient and compliant with building regulations. Let's delve into exploring these versatile products, their practical applications, and general advice on choosing the right insulation board for your needs.
Celotex Insulation Boards
Celotex offers a range of general-purpose and specialised PIR insulation boards such as the GA4000, XR4120, and XR4000 which are renowned for their versatility and exceptional thermal performance. Celotex insulation boards cater to various applications such as floor, wall, and roof insulation. They are praised for being lightweight and easy to cut, making them suitable for both DIY and professional projects. Be it the refurbishment of an existing property or insulation of a new build, Celotex boards in the 120mm category are an impeccable choice.
Kingspan Thermaroof Insulation Boards
Kingspan’s specialised flat roof boards, like the TR27 and TR26, and the TR24 are crafted specifically for flat roof insulations. These boards provide a distinctive combination of high compressive strength and excellent thermal performance. Designed to withstand the test of the external environment, these boards work significantly to minimise heat loss in flat roofing applications and can be used under various waterproofing systems. Kingspan also brings you the K-Roc Rainscreen Slab, ensuring your façade is not just aesthetically pleasing but also thermally efficient and fire-safe.
Ballytherm Insulation
Ballytherm’s insulation boards are geared towards providing efficient thermal solutions for walls, floors, and roofs. The Ballytherm 2.4m x 1.2m boards in various thicknesses including 120mm, promise efficient, consistent insulation and are often chosen for their reliability and durable performance.
Recticel Eurothane Eurodeck
Recticel insulation boards, such as the Eurothane Eurodeck, are esteemed for their application in warm flat roofs under mechanically fixed single-ply waterproofing membranes. The boards are recognized for their commendable dimensional stability and optimal insulation performance, rendering them a popular choice among professionals for commercial projects.
Unilin Thin-R PIR Boards
Unilin’s Thin-R PIR 120mm insulation boards bring forth enhanced thermal conductivity coefficients, ensuring that your residential or commercial space is insulated effectively with thinner boards, thereby saving on space. Unilin ensures that high performance doesn’t always require bulk – a beneficial choice for applications where space is at a premium.
Guidance on Selection
Choosing the right insulation board from the 120mm category revolves around identifying the specific needs of your project. Here are some general guidelines:
Application Area: Identify whether the insulation is for walls, floors, or roofs as some products are specialised for specific applications.
Thermal Conductivity: Consider boards with lower thermal conductivity for enhanced insulation.
Compressive Strength: For areas like floors that may bear loads, select boards with higher compressive strength.
Fire Resistance: Depending on your project’s safety requirements, choose boards with appropriate fire-resistant properties.
Environmental Conditions: For external applications, opt for boards that can withstand environmental stress like Kingspan’s Thermaroof series.