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Knauf Loft Insulation Roll (8 Products)

Loft insulation should always be a priority for homeowners, but it's especially top of mind when the weather takes a turn for the worse (or your utility bills skyrocket). No one in the industry does loft insulation quite like Knauf Insulation. Made using glass mineral wool and Knauf Insulation's innovative ECOSE Technology, Knauf Loft Insulation Roll ensures excellent noise dampening in pitched roofs (at ceiling level) whilst also improving thermal and fire performance. 

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Knauf Loft Insulation Roll

What Are Loft Rolls?

Loft roll is a malleable fibreglass insulation product manufactured by combining glass and bonding agents. 

The fibrous matting of the rolls traps air and prevents it from circulating and causing convection currents. With a thermal conductivity of 0.044 W/mK, loft insulation rolls are an excellent choice for those looking to cut back on energy costs.


What's more, loft insulation rolls are also non-combustible (meaning they will not ignite or burn when subjected to fire or heat) and achieve the highest possible level of fire performance with an impressive A1 rating on the Euroclass scale.

Knauf Loft Roll Applications

Knauf Earthwool Loft Roll 44's primary use is for the thermal insulation of pitched roofs at ceiling level, although it can also be used to thermally insulate floors. These 1140mm wide short-length rolls are supplied partially perforated to produce either 2 rolls 570mm wide or 3 rolls 380mm wide.

Primary Applications: 

  • Pitched roof applications - ceiling level (cold lofts)
  • Floors


When used at ceiling level it is usually laid in two layers, with the first layer between the joists and the second layer over, and at right angles to the joists. A first layer will give a good enough thermal performance, but a second layer will improve the thermal resistance of the buildup even further. 

The rolls are easier to install correctly than other insulants such as rigid boards because they adapt to any slight imperfections in the substrate and knit together, eliminating any air gaps.

Knauf Earthwool Loft Roll 44 Features & Benefits

Knauf Insulation are market leaders when it comes to loft insulation. Knauf Earthwool Insulation Loft Roll 44 Combi-Cut products are supplied partially perforated, meaning you can use them between timber joists at either 400mm or 600mm centres. 

Knauf Insulation Earthwool Combi-Cut products also come in long lengths allowing quick and simple installation, maximising on-site efficiency. 

Unlike other competitor brands, the ECOSE technology used in Knauf loft insulation's manufacture ensures they are a lot softer and easier to handle than standard loft insulation. 

Let's take a look at the specs:

  • Excellent thermal performance
  • Improves the thermal and energy efficiency in your home
  • Odourless, rot-proof and non-hygroscopic
  • Do not sustain vermin and will not encourage the growth of fungi, mould or bacteria
  • Contains no ozone-depleting substances or greenhouse gases
  • Euroclass A1 reaction to fire classification
  • Compression-packed and lightweight for easy handling and moving around a site
  • Helps to save on your house energy bills

Knauf Earthwool Loft Roll 44 Insulation Certifications

  • Generic BRE Green Guide Rating A+
  • Classified as Zero ODP (Zero Ozone Depletion Potential) and Zero GWP (Zero Global Warming Potential)
  • A1 Euroclass Fire Rating
  • Manufactured in accordance with BS EN 13162
  • Awarded the DECLARE `Red List Free’ label - meaning no 'Red List' ingredients, including formaldehyde or phenol

Frequently Asked Knauf Loft Roll Questions

Frequently Asked Knauf Loft Insulation Roll Questions

How Many Rolls of Insulation Do I Need for My Loft?

There is no definite answer to this question. Each loft has different dimensions and therefore, different insulation needs. We suggest that you measure the width and length of the areas that you want to insulate to work out the m2. Then divide the total number of m2 by the size of the roll. From this, you can work out how many rolls you would need. 


We always recommend allowing between 5-10% for wastage. If you are unsure, feel free to get in touch with our insulation experts and a member of our friendly team will be happy to help.

We also recommend using good-quality rolls that come pre-perforated. Pre-perforated rolls allow you to choose between using the roll as a full-width roll or splitting it into a length that better suits your needs.

How Does Loft Insulation Work?

Around 25% of the heat in an uninsulated home escapes through the roof. In order to best determine which insulation option is for you, it's important to understand how loft insulation works and where heat escapes from your home (e.g. windows, doors, walls).


Most loft insulation works by trapping heated air within the fibres of the material's matting, preventing it from moving through the material. Consequently, ensuring that your loft's insulation is properly installed is key to its efficiency.

Can Loft Insulation Still Be Installed If I Have Down Lights?

Although you might think that having downlights installed would make it harder to insulate your loft, actually, installers will just cut around the fixtures and make sure that they're covered with a cap.

What Is The Recommended Loft Insulation Depth? 

Between 270-300mm.

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