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Glass Wool Insulation

Glass mineral wool insulation from URSA and ODE – loft roll, cavity batts, timber-frame rolls and acoustic partition roll – at trade prices, delivered to England.

Choosing mineral wool

  • Loft roll: URSA 10 Diverso (150mm and 200mm) and ODE Lunaflex Loft Roll Ultra 42 (100mm, 150mm and 200mm). For a typical loft, lay a first layer between the joists and a second layer across them to reach around 270–300mm in total.
  • Cavity batts: URSA Cavity Batt 32 and 35, 1350 × 455mm, 75–150mm, for full-fill masonry cavity walls.
  • Timber frame and stud walls: URSA Frametec 32 and 35 rolls in 90mm and 140mm.
  • Acoustic partition roll: URSA Acoustic Roll and ODE Lunaflex APR HP, 25–100mm, for metal or timber stud partitions, plus URSA Party Wall Roll.

The number in names like Cavity Batt 32 or Frametec 35 is the thermal conductivity (0.032, 0.035 W/mK) – lower means better insulation per mm. Planning a stud wall? Our drywall partition calculator includes acoustic roll. For stone wool slabs see Rockwool acoustic insulation.

Delivery: prices are ex VAT. We deliver to England free on every order, with a £400 ex VAT minimum order.

40 products

  • Knauf Insulation Loft Roll 44 Combi-Cut 100mm

    Knauf Insulation Loft Roll 44 Combi-Cut – 100mm (13.89...

    £31.29 ex VAT£37.55 inc VAT

    In stock

  • Knauf Insulation Loft Roll 44 Combi-Cut 150mm

    Knauf Insulation Loft Roll 44 Combi-Cut – 150mm (9.18m...

    £31.29 ex VAT£37.55 inc VAT

    In stock

  • Knauf Insulation Loft Roll 44 Combi-Cut 170mm

    Knauf Insulation Loft Roll 44 Combi-Cut – 170mm (8.01m...

    £31.29 ex VAT£37.55 inc VAT

    In stock

  • Knauf Insulation Loft Roll 44 Combi-Cut 200mm

    Knauf Insulation Loft Roll 44 Combi-Cut – 200mm (6.84m...

    £31.29 ex VAT£37.55 inc VAT

    In stock

  • ODE Lunaflex Loft Roll Ultra 42 100mm

    ODE Lunaflex Loft Roll Ultra 42 – 100mm (10.83m² roll)

    £27.59 ex VAT£33.11 inc VAT

    In stock

  • ODE Lunaflex Loft Roll Ultra 42 150mm

    ODE Lunaflex Loft Roll Ultra 42 – 150mm (7.98m² roll)

    £31.29 ex VAT£37.55 inc VAT

    In stock

  • ODE Lunaflex Loft Roll Ultra 42 200mm

    ODE Lunaflex Loft Roll Ultra 42 – 200mm (6.84m² roll)

    £32.49 ex VAT£38.99 inc VAT

    In stock

  • URSA 10 DIVERSO Loft Roll 150mm

    URSA 10 DIVERSO Loft Roll – 150mm (8.55m² roll)

    £30.57 ex VAT£36.68 inc VAT

    In stock

  • URSA 10 DIVERSO Loft Roll 200mm

    URSA 10 DIVERSO Loft Roll – 200mm (6.27m² roll)

    £29.73 ex VAT£35.68 inc VAT

    In stock

  • Knauf Insulation DriTherm Cavity Slab 32 100mm

    Knauf Insulation DriTherm 32 Cavity Slab 1200 × 455mm ...

    £35.23 ex VAT£42.28 inc VAT

    In stock

  • Knauf Insulation DriTherm Cavity Slab 37 100mm

    Knauf Insulation DriTherm 37 Cavity Slab 1200 × 455mm ...

    £31.82 ex VAT£38.18 inc VAT

    In stock

  • URSA CAVITY BATT 32 Glass Mineral Wool Insulation 100mm

    URSA CAVITY BATT 32 Glass Mineral Wool Insulation 1350...

    £29.40 ex VAT£35.28 inc VAT

    In stock

  • URSA CAVITY BATT 32 Glass Mineral Wool Insulation 125mm

    URSA CAVITY BATT 32 Glass Mineral Wool Insulation 1350...

    £29.70 ex VAT£35.64 inc VAT

    In stock

  • URSA CAVITY BATT 32 Glass Mineral Wool Insulation 150mm

    URSA CAVITY BATT 32 Glass Mineral Wool Insulation 1350...

    £33.80 ex VAT£40.56 inc VAT

    In stock

  • URSA CAVITY BATT 32 Glass Mineral Wool Insulation 75mm

    URSA CAVITY BATT 32 Glass Mineral Wool Insulation 1350...

    £32.93 ex VAT£39.52 inc VAT

    In stock

  • URSA CAVITY BATT 32 Glass Mineral Wool Insulation 85mm

    URSA CAVITY BATT 32 Glass Mineral Wool Insulation 1350...

    £32.26 ex VAT£38.71 inc VAT

    In stock

  • URSA CAVITY BATT 35 Glass Mineral Wool Insulation 100mm

    URSA CAVITY BATT 35 Glass Mineral Wool Insulation 1350...

    £22.42 ex VAT£26.90 inc VAT

    In stock

  • URSA CAVITY BATT 35 Glass Mineral Wool Insulation 125mm

    URSA CAVITY BATT 35 Glass Mineral Wool Insulation 1350...

    £26.84 ex VAT£32.21 inc VAT

    In stock

  • URSA CAVITY BATT 35 Glass Mineral Wool Insulation 150mm

    URSA CAVITY BATT 35 Glass Mineral Wool Insulation 1350...

    £25.60 ex VAT£30.72 inc VAT

    In stock

  • URSA CAVITY BATT 35 Glass Mineral Wool Insulation 75mm

    URSA CAVITY BATT 35 Glass Mineral Wool Insulation 1350...

    £24.92 ex VAT£29.90 inc VAT

    In stock

  • URSA FRAMETEC 32 Glass Mineral Wool Roll 140mm

    URSA FRAMETEC 32 Glass Mineral Wool Roll – 140mm (4.29...

    £66.10 ex VAT£79.32 inc VAT

    In stock

  • URSA FRAMETEC 32 Glass Mineral Wool Roll 90mm

    URSA FRAMETEC 32 Glass Mineral Wool Roll – 90mm (6.38m...

    £63.75 ex VAT£76.50 inc VAT

    In stock

  • URSA FRAMETEC 35 Glass Mineral Wool Roll 140mm

    URSA FRAMETEC 35 Glass Mineral Wool Roll – 140mm (4.93...

    £43.10 ex VAT£51.72 inc VAT

    In stock

  • URSA FRAMETEC 35 Glass Mineral Wool Roll 90mm

    URSA FRAMETEC 35 Glass Mineral Wool Roll – 90mm (7.54m...

    £43.92 ex VAT£52.70 inc VAT

    In stock

Glass mineral wool: buying guide

Glass mineral wool comes in rolls and batts that are quick to fit, compress for delivery and are non-combustible: the URSA products we stock are rated Euroclass A1. It’s the go-to material for lofts, stud walls, timber frames and full-fill cavities.

Which product for which job?

  • Lofts – ODE Lunaflex Loft Roll Ultra 42 (100, 150 and 200mm) and URSA 10 Diverso (150 and 200mm). Lay the first layer between the joists and a second layer across them, aiming for around 270–300mm in total.
  • Stud walls and partitions – URSA Acoustic Roll and ODE Lunaflex APR HP, 25–100mm, for sound insulation in metal or timber stud walls.
  • Timber frame walls – URSA Frametec 32 and 35 rolls in 90mm and 140mm.
  • Masonry cavities – URSA Cavity Batt 32 and 35 for full-fill cavity walls, and URSA Party Wall Roll for separating walls.

What the numbers mean

The number in names such as Frametec 35 or Cavity Batt 32 is the thermal conductivity: 0.035 or 0.032 W/mK. The lower the number, the better the insulation per millimetre. URSA 10 Diverso loft roll, for example, is listed at 0.044 W/mK. Each roll or pack shows its coverage in m² in the product name.

R-values by thickness

For the λ values listed on our URSA product pages. λ 32 products (λ 0.032 W/mK): Cavity Batt 32, Frametec 32; λ 35 products (λ 0.035 W/mK): Acoustic Roll, Cavity Batt 35, Frametec 35, Party Wall Roll; Loft roll (λ 0.044 W/mK): URSA 10 Diverso.

Thicknessλ 32 products
λ 0.032		λ 35 products
λ 0.035		Loft roll
λ 0.044
50mm1.551.401.10
75mm2.302.101.70
100mm3.102.852.25
140mm4.354.003.15
150mm4.654.253.40
200mm6.255.704.50

R-values in m²K/W, worked out as thickness (m) ÷ λ and rounded down to the nearest 0.05. Each product page has a table for the exact thicknesses in that range. Check the manufacturer’s declaration of performance and your U-value calculation for Building Regulations. Not every product comes in every thickness listed here.

Work out your quantities

Use the insulation calculator to turn your area into rolls or packs, including a second loft layer. For stud walls, the drywall partition calculator includes acoustic roll alongside studs, track and board. Our loft insulation guide covers fitting.

Fitting tips

  • Wear gloves, long sleeves and a dust mask when cutting and handling.
  • Don’t squash loft roll under boarding: compressed insulation performs worse. Use raised loft legs if you need storage.
  • Keep insulation clear of recessed lights and flues unless the fitting is rated for it, and keep eaves ventilation clear.

Delivery and minimum order: prices are shown ex VAT. We deliver to England. There’s a £400 ex VAT minimum order, and delivery is free on every order. Need a price for a large or mixed load? Call 03330 908479.

Frequently asked questions

How thick should loft insulation be?

A common target is around 270–300mm in total, laid in two layers: one between the joists and one across them. Check the requirement for your project with building control.

What’s the difference between loft roll and acoustic roll?

Loft roll is made for thermal insulation laid horizontally in lofts. Acoustic partition roll is designed to fit between studs in walls to reduce sound transfer.

How many rolls do I need?

Divide the area by the m² shown in the roll name, multiply by the number of layers, add a waste allowance and round up. The insulation calculator does this for you.

Is glass mineral wool fire safe?

The URSA products we stock are rated Euroclass A1 (non-combustible). Check the reaction to fire rating on each product page.

Glass wool or stone wool?

Both are mineral wools. Glass wool is lighter and comes in compressed rolls; stone wool, such as Rockwool slabs, is denser and is often chosen for acoustic and fire applications.

Is there a minimum order and how much is delivery?

There’s a £400 ex VAT minimum order on insulation and building materials. Delivery to England is free on every order.

  • Exceptional Thermal Insulation
    Glass wool is designed to minimise heat loss and maintain optimal indoor temperatures. With its high thermal resistance, it’s a dependable solution for conserving energy, reducing heating and cooling costs, and enhancing overall comfort. Whether it’s walls, roofs, or floors, glass wool helps achieve impressive thermal performance and energy savings.
  • Outstanding Acoustic Performance
    Ideal for acoustic partition walls or floors, glass wool insulation significantly reduces sound transmission, creating quieter living or working environments. This makes it an excellent choice for residential homes, schools, offices, and other noise-sensitive spaces.
  • Environmentally Friendly and Sustainable
    Crafted from up to 80% recycled glass, glass wool insulation contributes to building sustainability. Using recycled materials not only reduces waste but also aligns with environmental targets, making it a responsible choice for construction projects.
  • Fire Safety Characteristics
    With its non-combustible nature and high fire resistance, glass wool insulation meets strict building regulations and standards. It adds a layer of safety, giving you peace of mind in both residential and commercial settings.
  • Glass Mineral Wool Rolls
    Produced in flexible rolls, glass wool is perfect for insulating long spans like lofts or walls. The material is easy to roll out and cut to the required size for precise installation.
  • Batts and Slabs
    Designed for cavity wall and acoustic partitions, these pre-cut pieces are high-density and ideal for providing exceptional performance in smaller areas or specific spaces.
  • Blown or Sprayed Application
    For hard-to-reach spaces or irregularly shaped cavities, blown or sprayed glass wool is an effective insulating option. This ensures even coverage with minimal gaps.
  • Cavity Wall Insulation
    Glass wool rolls or batts are a cost-effective and efficient way to insulate cavity walls, reducing heat loss and improving thermal efficiency.
  • Roof and Loft Insulation
    Whether for pitched roofs or flat roofs, glass wool delivers excellent thermal insulation and is easy to install between timber joists or rafters.
  • Floor Insulation
    For homes with timber or concrete floors, glass wool helps minimise temperature fluctuations and improve energy efficiency while also reducing sound transfer between levels.
  • Acoustic Insulation
    Used in walls, ceilings, or partitions, glass wool enhances acoustic comfort by absorbing sound waves, making it an excellent choice for multi-occupancy buildings.
  • Industrial and Commercial Use
    Glass wool slabs are suitable for high-performance requirements in commercial or industrial settings, offering both thermal and acoustic benefits.
  1. Energy Efficiency
    Glass wool reduces heat loss and helps to maintain optimal temperatures, significantly lowering energy bills and supporting energy conservation.
  2. Lightweight and Easy to Install
    Thanks to its lightweight and flexible nature, glass wool is easy to cut, handle, and fit, making installation quick and hassle-free.
  3. Versatility
    Available in various forms like rolls, batts, slabs, or blown insulation, glass wool adapts to virtually any space or application.
  4. Durability and Long-Lasting Performance
    Manufactured to withstand temperature variations and environmental factors, glass wool offers reliable performance over time.
  5. Health and Safety Approved
    Modern glass wool products are designed with user safety in mind, featuring low-irritation binders and compliance with strict health standards.
  • For Cavity Walls: Measure the dimensions of the cavity and cut the insulation to size. Batts and slabs are ideal for this application. Ensure the material fits snugly between wall studs to prevent air gaps.
  • For Roofs and Lofts: Rolls can be unfurled and placed between rafters or joists, while additional layers can be applied to enhance thermal resistance. Always ensure good ventilation in loft spaces to prevent moisture build-up.
  • For Acoustic Partitions: Use slabs or batts placed tightly within stud walls to maximise sound absorption. Pair with acoustic boards for superior noise control.
  • For Floors: Fit glass wool between timber joists before adding floorboards or OSB sheets. For concrete floors, lay the insulation beneath the screed for optimal performance.