What Is Knauf Insulation?
Knauf Insulation is one of the world’s largest manufacturers of insulation products, producing a comprehensive range of glass mineral wool, rock mineral wool, and extruded polystyrene solutions. Founded in 1932, Knauf has grown into a globally recognised brand trusted by builders, architects, specifiers, and contractors across more than 40 countries. In the UK, Knauf Insulation is a household name in the construction industry, synonymous with quality, compliance, and energy efficiency.
Knauf’s product range covers virtually every area of a building — from lofts and walls to floors and roofs — making them one of the most versatile insulation manufacturers available. Their glass mineral wool products, in particular, are among the most widely used insulation materials in UK residential construction.
Knauf Loft Roll Insulation
One of Knauf’s most popular products is their loft roll insulation, a glass mineral wool product designed to be laid between and over the joists in a cold loft. Loft insulation is one of the most cost-effective energy efficiency improvements you can make to a home. Up to 25% of heat can be lost through an uninsulated roof, and a properly installed loft roll can dramatically reduce that figure.
Knauf loft roll is lightweight, flexible, and easy to cut and handle on site. It comes in a range of thicknesses, with the current Building Regulations Part L recommendation being a total depth of 270mm for new-build properties — typically achieved with 100mm between the joists and 170mm laid at right angles across the top. Knauf products are available in widths to suit standard joist spacings, making installation straightforward for experienced fitters.
The Benefits of Knauf Insulation
There are many reasons why Knauf Insulation products remain a top choice for contractors and homeowners alike:
Excellent Thermal Performance
Knauf glass mineral wool achieves low lambda values (thermal conductivity), meaning a thinner layer provides the same insulation performance compared to lower-performing materials. This makes it particularly effective in applications where space is limited.
Fire Safety
Knauf mineral wool products are non-combustible, classified as Euroclass A1 — the highest possible fire rating. This makes them suitable for use in buildings where fire safety is a priority, including schools, care homes, and commercial properties, as well as standard residential builds.
Acoustic Performance
In addition to thermal insulation, Knauf mineral wool provides excellent sound absorption. This makes it an ideal choice for party walls, floors between storeys, and anywhere noise reduction between rooms or properties is required.
Sustainability
Knauf Insulation has a strong commitment to sustainability. Their glass mineral wool products are made using a significant proportion of recycled glass, reducing the demand for virgin raw materials. Their manufacturing processes have been designed to minimise energy use and carbon emissions, and their products contribute directly to the UK’s journey toward Net Zero by reducing the energy demand of the buildings they insulate.
Building Regulations Compliance
All Knauf Insulation products are designed and tested to meet UK Building Regulations, including Part L (Conservation of Fuel and Power), Part E (Resistance to Sound), and Part B (Fire Safety). This means that specifying Knauf products gives contractors and homeowners confidence that the installation will meet regulatory requirements.
Where Can Knauf Insulation Be Used?
Knauf produce insulation solutions for virtually every part of a building:
Lofts and Roofs
Knauf loft roll is ideal for insulating cold loft spaces — the most common type of roof insulation in existing UK homes. For warm roof applications, where the insulation is placed at rafter level rather than ceiling level, Knauf produce specialist products designed to work within the roof build-up.
Walls
Knauf cavity wall insulation is designed to be blown or friction-fitted into the cavity of a masonry wall. For solid walls, Knauf external wall insulation (EWI) and internal wall insulation (IWI) systems provide effective solutions for older properties without a wall cavity.
Floors
Knauf floor insulation products are suitable for use in suspended timber floors and screed applications, helping to prevent heat loss through the floor slab and contributing to overall building energy efficiency.
Partitions and Internal Walls
Knauf acoustic insulation products are widely used in internal partitions to reduce sound transmission between rooms — particularly valuable in multi-occupancy residential buildings, hotels, and offices.
Knauf Insulation and SuperFoil4Roofs
At SuperFoil4Roofs, we work with a range of insulation products to ensure every client gets the right solution for their specific project. Knauf Insulation products can work alongside or in combination with SuperFoil multifoil insulation, depending on the application and the thermal performance required.
For example, in a warm pitched roof application, SuperFoil multifoil insulation can be used at rafter level to achieve the required U-value in a slim profile, while Knauf products may be specified for secondary applications such as floor insulation or internal partitions within the same project. Our experienced team can advise on the best combination of products for your specific building, taking into account the structure, the required U-value, the available space, and the budget.
Choosing the Right Insulation for Your Project
Whether you are renovating an existing property or building new, choosing the right insulation is one of the most important decisions you can make. The right product, correctly installed, will reduce your energy bills, improve comfort, and add value to your property for decades to come.
Knauf Insulation provides a proven, trusted, and widely available option for many common insulation applications. SuperFoil multifoil insulation offers a high-performance, space-saving alternative for roof and wall applications where achieving a good U-value in a slim build-up is important.
The best insulation strategy often involves combining different products and systems to achieve the required thermal, acoustic, and fire performance. SuperFoil4Roofs can help you navigate those choices and ensure your project is installed to the highest standard.
Get in touch today for a free survey and expert advice on the right insulation solution for your property.