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Insulation

Insulation products are essential for your home, helping minimise the heat lost from your home. Usually applied to your roof or walls, home insulation helps your home retain heat, helping to bring down your energy bills. Whether it's <a href="/building-supplies/insulation/insulation-rolls.cat">insulation rolls</a>, <a href="/building-supplies/insulation/insulation-boards.cat">insulation boards</a>, or <a href="/building-supplies/insulation/loft-stilts.cat">loft legs</a>, we host a wide selection of ceiling insulation or wall insulation products to choose from. Find the best insulation products for your project, from floor insulation to house insulation and building insulation, online at B&Q.

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By Type

Explore our insulation range by type to quickly find the right thermal or acoustic solution for your home improvement project. If you're upgrading your loft or topping up existing layers, our loft rolls offer flexible coverage that fits easily between joists and rafters. These soft, blanket-style materials provide reliable heat retention and help reduce energy loss in roof spaces. For more rigid thermal performance, our insulation sheets are suitable for floors, walls and pitched roofs. These sturdy panels provide excellent thermal resistance and are ideal where a firm, stable insulating layer is required. For denser formats suited to stud walls, ceilings and acoustic projects, explore our slab insulation, designed to improve both heat retention and noise reduction.

Where noise control is a priority, browse our sound insulation, engineered to absorb airborne noise in internal partitions and living spaces. For DIY convenience, insulation packs provide quick solutions for small areas or repair work. Hard‑to‑reach cavities can be improved using loose insulation, which pours easily into uneven voids. If you're building raised storage platforms in the loft, our loft insulation legs help maintain airflow above existing insulation. We also stock water tank insulation to minimise heat loss from stored hot water, and cavity closer options to seal exposed wall openings. For structural projects needing integrated insulation, browse our structural insulated panels, which combine strength with built-in energy efficiency.

By Material

Choosing insulation by material helps you compare thermal performance, acoustic properties and suitability for different areas of the home. If you’re looking for a lightweight and versatile option, explore polystyrene insulation, widely used for general thermal upgrades and DIY-friendly projects. For traditional fibre-based insulating performance, our glass mineral wool insulation provide dependable heat retention and sound absorption, making them ideal for lofts, cavity walls and stud partitions. If sustainability is a key consideration, explore natural thermal materials like wool insulation, which offers breathable warmth and improved acoustic comfort. For a low‑impact, eco‑forward option, cork insulation provides natural resilience and excellent insulating properties for floors and walls.

For high‑performance rigid insulation suitable for walls, floors and roofs, consider PIR thermal boards, which deliver superior thermal resistance in compact thicknesses. If you require durable rigid insulation for heavier structural applications, polyurethane insulation boards offer strong insulation-to-depth efficiency. In areas where radiant heat management matters, such as under floors or within roof structures, our foil-faced insulation help improve reflective performance. For sealing voids, boosting airtightness or insulating awkward spaces, foam insulation offers versatile thermal support. Exploring insulation by material ensures you match the right thermal, acoustic and environmental benefits to every part of your home.

By Size

Selecting insulation by size helps you achieve the right level of thermal performance throughout your home, whether you are upgrading loft spaces, lining internal walls or improving floor insulation. For loft areas, one of the most common depths is 100mm loft roll, which is often used as a base layer. Homeowners looking to boost overall energy efficiency may prefer deeper thermal coverage such as 150mm loft rolls, offering improved heat retention across attic and rafter spaces. For even greater performance, 200mm loft rolls helps meet recommended depth levels in one straightforward installation.

Rigid insulation boards provide consistent performance across walls, roofs and floors, and are available in a wide range of thicknesses. Slimmer formats such as 25mm thermal boards are well suited to tight spaces, while 40mm insulation boards offer a practical balance between depth and heat retention. For more demanding thermal requirements, 50mm insulation boards provide versatile performance across floors and partition walls. Projects requiring enhanced heat efficiency may benefit from deeper boards such as 75mm insulation boards or 90mm insulation boards, ideal for roofs and external wall applications. For high‑performance builds, 100mm insulation panels or even deeper options like 120mm thermal boards and 150mm insulation boards can help meet stringent U‑value targets. By selecting insulation based on size, you can ensure every part of your home achieves the right level of warmth, comfort and long‑term energy efficiency.

By Brand

Exploring insulation by brand helps you compare trusted manufacturers known for high‑quality thermal efficiency, acoustic performance and long‑lasting durability. For dense, reliable mineral wool suitable for walls, ceilings and floors, browse Rockwool insulation, recognised for their fire-resistant and noise‑reducing properties. These products are ideal for improving both comfort and safety in internal partitions and loft installations. If your project requires premium rigid insulation boards, consider Kingspan insulation boards, widely used in professional builds for their excellent thermal ratings and robust performance in floors, roofs and external wall systems. For versatile loft insulation or cavity applications, Knauf insulation provide dependable, easy-to-fit insulating layers.

For lightweight EPS products used in flooring and general thermal improvements, Jablite insulation offer a practical, cost-effective solution. If radiant heat control is a priority, explore reflective foil layers from ThermaWrap insulation, suitable for floors, roofs and wall cavities. For rigid, high‑performance panels used in structural or specialist builds, Unilin insulation deliver strong thermal gains. When working on roofing applications, IKO roofing insulation provides stable, moisture‑resistant performance. Comparing insulation by brand makes it easier to find the right balance of quality, performance and suitability for every area of your home.

FAQs

How much insulation do I need in my loft?

Most UK homes benefit from around 270mm of loft insulation to reduce heat loss and improve year‑round energy efficiency. This depth is typically achieved by layering multiple rolls, allowing you to build up thermal resistance without compressing existing material. Adequate insulation in the loft helps maintain consistent indoor temperatures, lowers heating costs and improves comfort, especially during colder months. It also supports better overall performance across your home's wider insulation system.

 

What is the difference between insulation rolls and insulation boards?

Insulation rolls are flexible, lightweight and ideal for covering large loft areas or fitting between timber joists. They’re simple to handle and great for improving thermal performance in roof spaces. Insulation boards, however, are rigid panels designed for walls, floors and roofs where stronger structural support or higher thermal resistance is needed. Boards create a firm, consistent insulating layer, making them suitable for projects requiring stability, durability and deeper heat‑retention performance.

 

Which insulation material is best for soundproofing?

The most effective insulation for soundproofing is dense acoustic mineral wool or slab insulation, designed to absorb airborne noise and reduce transfer between rooms. These materials fill cavities tightly, limiting echoes and vibrations in stud walls, ceilings and floors. Their density also improves thermal performance, making them a dual‑use option for comfort and noise control. Acoustic insulation is ideal for media rooms, bedrooms, home offices and any space where noise reduction is important.

 

Is thicker insulation always better?

Thicker insulation generally improves heat retention, but the material type matters just as much as the depth. High‑performance options such as PIR boards offer exceptional thermal efficiency in slimmer layers, while mineral wool may require greater thickness to achieve the same U‑value. The best approach is to choose the right material and thickness combination for the specific area you’re insulating, ensuring it meets building regulations and delivers long‑term energy savings.

 

Can different types of insulation be used together?

Yes — combining insulation types is common and often the best way to achieve optimal thermal performance. Many lofts use a base layer of mineral wool topped with thicker rolls, while walls and floors may pair rigid boards with sound‑absorbing slabs. Using complementary materials helps meet building regulation U‑values, improves acoustic control and allows you to address different structural needs within the same space. Always ensure layers remain uncompressed to maintain full effectiveness.

 

How long does insulation last?

Most insulation products last for several decades — often 40 years or more — and maintain performance as long as they remain dry, well‑ventilated and undisturbed. Materials such as a PIR board or mineral wool are designed to resist settling or degradation, so once installed correctly, they continue providing consistent thermal efficiency. Checking your insulation occasionally for moisture, compression or gaps helps preserve long‑term effectiveness and ensures your home stays warm and energy efficient.

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