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Loft Insulation

Loft insulation helps reduce heat loss through the roof, keeping homes warmer in winter and cooler in summer, which can lower energy consumption. It can also work as a sound barrier, limiting external noise from entering the home. Many options, such as glass wool insulation (also known as fibreglass insulation), are fire resistant and water resistant. This type of insulation is suitable for both lofts and walls. Our range includes market-leading brands like Rockwool and ISOVER.

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  • Isover-Cavity-Wall-Slab-CWS-36-L-01.png

    ISOVER Cavity Wall Slab 36 Insulation 1200 x 455 x 75mm (8.74m2)

    CWS 36 is a glass mineral wool slab supplied in 50-150mm thicknesses. The strong, resilient, and flexible batts are 455mm wide to fit between standard wall tie spacing, for warmer rooms and greater occupant comfort.
  • Isover-Acoustic-Partition-Roll-APR-1200-L-01.png

    ISOVER APR1200 Acoustic Partition Insulation Loft Roll 75 x 1200mm (2x600) x 12.2m

    Isover Acoustic Partition Roll (APR 1200) provides high levels of acoustic insulation in partitions, walls and floors to meet requirements in domestic and non-residential buildings. A glass mineral wool roll providing high levels of acoustic insulation...
  • Rockwool%20RWA45%20Acoustic%20Insulation%20Slab%201200%20x%20600mm.png

    Rockwool RWA45 Acoustic Insulation Slab 1200 x 600 x 75mm

    Rockwool RWA45 75x600x1200 A1 ROCKWOOL RWA45 is a stone wool insulation for general building applications. ROCKWOOL RWA45 is a general building slab designed for use as acoustic, thermal and fire protection of walls, ceilings, floors and roofs. The...
  • Isover-RD-Party-Wall-Roll-L-01.png

    ISOVER RD Party Wall Insulation Roll 75 x (2 x 455) x 8500mm (7.74m2)

    The ISOVER RD Party Wall glass mineral wool roll is manufactured from up to 75% recycled glass making it a cost effective acoustic insulation used to reduce the passage of sound across a masonry party wall and minimise the air movement within the cavity,...

Glass wool insulation

What is Glass Wool Insulation?

Glass Wool, also known as Fibreglass Insulation, is made by mixing natural glass with recycled glass. The recycled glass can come from items like car windscreens, bottles, and window panes. This glass is melted, pushed through a fine mesh to create thin fibres, and then cooled naturally.

Benefits of Glass Wool

  • Acoustic insulation – Helps reduce noise transfer between rooms or areas. Commonly used in places where soundproofing is needed but compressive strength is not. Often sold as fibreglass batts.
  • Water resistance – Works well in cavity walls and can be adapted to suit specific wall conditions.
  • Fire safety – Non-combustible and won’t burn. It has a European A1 fire rating, making it effective in protecting a building during a fire.
  • Thermal efficiency – A lightweight, cost-effective way to keep heat in. It can achieve the same results as other materials at about half the weight.

Where Can Glass Wool Be Used?

  • Lofts – Loft insulation helps save both energy and money. Our Spacesaver range comes in thin, strong rolls that are easy to store and install.
  • Walls built to regulations – Some walls need to meet specific building standards. RD35 is a high-density glass wool option that is slim yet meets a variety of wall construction requirements.
  • Partition (party) walls – These internal walls separate rooms. Glass Wool reduces sound travel between spaces.
  • External timber frame walls – Improves both thermal and acoustic performance, keeping buildings warm and blocking unwanted noise.

Frequently Asked Questions

How much loft insulation do I need?
To work out how much loft insulation you need, you should first measure the thickness of your current insulation and work out how much you will need to take the depth to 270mm. Next, you should measure the total area of your loft. This can be done by measuring both the length and width of the space in metres and multiply the length by the width, which will give you the square metre area (m2) of your loft. For example, if the total area in m2 is 50, you will need 8 rolls of insulation.
How thick should loft insulation be?
Insulation should be around 200mm to 270mm thick.
How much is loft insulation?
The average cost of loft insulation is between £5 and £11 per square metre.
Is loft insulation flammable?
Loft insulation is non-combustible.
What is loft insulation made of?
Loft insulation is made of glass fibre, sheep’s wool, hemp, or recycled polyester.

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