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Loft Insulation

Loft insulation has great acoustic and thermal performance and is fire and water resistant. Glass wool insulation can be used in lofts and walls.  

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  • ISOVER Slab 32 Cavity Wall Insulation 50 x 455 x 1200mm (7.64m2) ISOVER Slab 32 Cavity Wall Insulation 50 x 455 x 1200mm (7.64m2)

    ISOVER Slab 32 Cavity Wall Insulation 50 x 455 x 1200mm (7.64m2)

    ISOVER Cavity Wall Slab (CWS) 32 is a BBA certified glass mineral wool slab that is made from 75% recycled glass. Cavity Slab 32 offers exceptional thermal performance in external masonry cavity walls, with a thermal conductivity of 0.032 W/m.K. hence...
  • ISOVER RD Party Wall Insulation Roll ISOVER RD Party Wall Insulation Roll

    ISOVER RD Party Wall Insulation Roll

    £49.04 - £52.26 (Ex VAT)
    £58.85 - £62.71 (Inc VAT)
    The ISOVER RD Party Wall glass mineral wool roll is 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, improving its thermal performance. Available in a...
  • ISOVER Cavity Wall Slab 36

    ISOVER Cavity Wall Slab 36

    £35.14 - £42.48 (Ex VAT)
    £42.17 - £50.98 (Inc VAT)
    ISOVER Cavity Wall Slab 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 Cavity Wall Slab 34 ISOVER Cavity Wall Slab 34

    ISOVER Cavity Wall Slab 34

    £115.74 - £116.09 (Ex VAT)
    £138.89 - £139.31 (Inc VAT)
    ISOVER Cavity Wall Slab (CWS) 34 is a BBA certified glass mineral wool slab, made from 75% recycled glass. Cavity Slab 34 offers exceptional thermal performance in external masonry cavity walls and with thermal conductivity of 0.034 W/m.K. it can reduce...
  • ISOVER Cavity Wall Slab 32

    ISOVER Cavity Wall Slab 32

    £44.65 - £58.14 (Ex VAT)
    £53.58 - £69.77 (Inc VAT)
    A higher performing glass mineral wool full-fill cavity slab providing excellent thermal performance in masonry cavity walls to meet or exceed the requirements of Part L Building Regulations (England and Wales), enabling U-Values as low as 0.23 W/m2K...
  • ISOVER Acoustic Insulation Partition Roll+O16344

    ISOVER Acoustic Insulation Partition Roll+O16344

    £44.71 - £61.34 (Ex VAT)
    £53.65 - £73.61 (Inc VAT)
    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...
  • ISOVER Spacesaver Wool Insulation Roll ISOVER Spacesaver Wool Insulation Roll

    ISOVER Spacesaver Wool Insulation Roll

    £34.53 - £40.98 (Ex VAT)
    £41.44 - £49.18 (Inc VAT)
    ISOVER Spacesaver is a glass mineral wool roll available in a range of thicknesses from 100-200mm, and supplied pre-perforated to 3 x 386mm and 2 x 580mm width to fit between common joists. The economical and easy-to-install glass mineral wool rolls...
  • ROCKWOOL 274413 SOUND INSULATION SLAB 1200x600x50

    ROCKWOOL 274413 SOUND INSULATION SLAB 1200x600x50

    £54.04 - £57.61 (Ex VAT)
    £64.85 - £69.13 (Inc VAT)
    The Sound Insulation Slab is designed to be used to reduce noise between rooms in a building and between connecting properties. It does this by dampening vibration-based noise as it travels through structures, whilst reducing sound waves as they transmit...

Glass wool insulation

What is Glass Wool insulation?

Sometimes referred to as Fibreglass Insulation, Glass Wool is created by blending together natural glass with recycled glass. The recycled glass could come from a variety of original products including car windscreens, glass bottles, and window panes. The glass is melted down and converted into glass fibres by pushing the hot mixture through a fine mesh and allowing it to cool naturally.

It can be used for a variety of purposes including:

Acoustic Insulation – Reducing noise passing from one area of a building to another in situations where compressive strength is not needed. Acoustic Insulation is often called Fibreglass Batts.
Resistance against water – When used in Cavity Walls, Fibreglass is effective because it can be engineered to meet the conditions of the wall.
Fire Resistant – Despite common misconceptions, Fibreglass Insulation is non-combustible, meaning that it won’t burn. In fact, it has a European A1 fire classification. Therefore, it will be effective during a building fire.
Thermal Performance – Glass Wool is a cost-effective and versatile option for thermal performance, that is more thermally efficient than alternatives, meaning that it can achieve the same results as other choices but with half the weight.

Where can Glass Wool be used?

There are many situations where Glass wool can be used:

Lofts – A good insulation in your loft is crucial, as it will save on two key areas of your life: money and energy. Our Spacesaver range of loft insulation offers thermal performance and is supplied in thin rolls of Glass Wool that take up less space, without compromising on strength or resilience.
Walls with Building Specifications – Quite often walls need to be built to specific specifications to pass Building Regulations. RD35 is a high-density glass rock that is slim but designed to meet a variety of wall construction regulations.
Partition Walls – Party Walls are those located within a building, that divide rooms from each other. Thermal insulation is commonly needed here to prevent sounds travelling too easily through the walls.
External Timber Frame Walls – Glass Wool offers a variety of benefits to external walls, including thermal and acoustic performance to ensure a building remains warm, whilst preventing sounds from passing through.

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.

How to guides


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