Loft Insulation Roll

Whilst heat rising in your home cannot be avoided, heat loss can. You can easily improve the thermal envelope of your home by installing loft roll (a form of fibreglass insulation) in your loft and pitched roof spaces. The rolls are both lightweight and non-combustible (with an A1 Euroclass rating). With a thermal conductivity of 0.044 W/mK, loft insulation roll helps to retain heat in your home which would typically escape through the roof.

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What Are Loft Rolls?

Loft roll is a form of fibreglass insulation, otherwise known as glass mineral wool insulation.
As its name would suggest, this bunch of hair-like sized fibres are made of glass and a bonding agent which are manufactured together to create a flexible and air pocket-filled product. These small pockets trap gas (a poor conductor of thermal energy), ensuring heat is trapped in the insulation, thus preventing it from rising through the roof. Loft insulation rolls have a thermal conductivity of 0.044 W/mK, making them the perfect energy-saving companion.

Loft insulation rolls are also non-combustible and achieve the highest possible level of fire performance with an A1 rating on the Euroclass scale.

We stock popular loft rolls like Knauf Earthwool Loft Roll 44 and Isover Spacesaver 44 Loft Insulation rolls. We also stock loft insulation boards here.

Knauf Earthwool Loft Roll 44

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 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. If you are looking for reliable and effective roof insulation, consider the Knauf 44 range.

We recommend Knauf loft insulation rolls to people who want to insulate pitched roofs at ceiling level - they are not used in cavity walls or floors. Most people lay these rolls in two layers. The first layer goes between the floor joists and the second layer goes over them. You can also install the second layer at right angles to the joists.

Let's take a look at the specs:

  • 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


Isover Spacesaver 44 Loft Insulation

Isover Spacesaver 44 Loft Insulation rolls are one of the most popular loft insulation options that we stock. Isover loft rolls are pre-perforated to 3x386mm and 2x580mm widths, saving you time and guaranteeing a concise cut. You can install them between and over joists in pitched roofs, and between joists in flat roofs and ground floor suspended timber. What's more, they are also super flexible and easy to handle.

For the green-minded amongst you, Isover Spacesaver products are an economic option; the rolls are manufactured from up to 80% recycled post-consumer glass that would otherwise go to landfill. Like the other loft rolls that we stock, this roll has a thermal conductivity of 0.044 W/mK.
Why not check the specs?

  • Manufactured from up to 80% recycled glass
  • Rated A1 on the Euroclass scale; they are non-combustible
  • Suitable for cold roof applications
  • Zero Ozone Depletion Potential (ODP) and Global Warming Potential of less than 5
  • Has a declared thermal conductivity of 0.044 W/mK
  • Will not sustain vermin, nor breed or promote fungi or bacteria


Loft Roll Insulation Thicknesses

You can buy glass mineral wool loft insulation roll in four different thicknesses: 100mm, 150mm, 170mm, and 200mm. 

Frequently Asked 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 rolls that come pre-perforated. Pre-perforated rolls allow you to choose between using the full length of the insulation or splitting it into a length that better suits your needs.

How to Cut Loft Insulation Rolls?

You can cut rolls in a few different ways based on the width and length of your space. You can use a utility knife, a carving knife, or even shears. Always mark your measurements on the roll before you begin cutting.

Before you get cutting, we recommend wearing goggles, aprons, and even protective glasses. If you are concerned about safety precautions, always consult with a professional.

How to Install Loft Insulation Rolls?

One of the benefits of loft insulation rolls is that they are very easy to handle and install. The real work starts when you inspect your roof and loft for signs of rot and deterioration. Before installation, you should always check your joists to make sure that they are safe to stand on.

We also recommend checking whether the back end of the light fittings from rooms below protrude into the loft. You should cover them with downlight covers so that they do not overheat.

Next, you want to lay the insulation between the joists. Once there is a layer of insulation between your joists you should lay another layer across the top in the opposite direction. It is important to not leave gaps between the rolls or to allow them to overlap so that you can ensure maximum thermal efficiency.

It should be noted that you can lose up to 5% of the heat in your home through your loft hatch. You should cut two pieces of insulation roll to match the size of the hatch. Staple them in place and attach draught-proof strips to the outside of the hatch to reduce heat loss and heating bills.
It's common to board your loft once you have insulated it, so you may need other building materials such as chipboard flooring.