Rockwool Full Fill Cavity Batts (All Sizes) Cavity wall Insulation
Rockwool Full Fill Cavity Batts (All Sizes) Cavity wall Insulation
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Rockwool Full Fill Cavity Batts (All Sizes)


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Order now and get free delivery on all Rockwool orders over £300 ex vat.

Estimated Delivery Time Of 7-10 Working Days

  • Cost-effective, fire-safe Rockwool Cavity Wall Insulation with A1 classification, lasting over 30 years.
  • Water-repellent, easy-install slabs fit seamlessly, enhancing energy efficiency and comfort.
  • Environmentally friendly, no GWP or ODP, versatile for various projects, and no timber battens required.

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These products are sold in pallet quantities only. Price Listed is per pallet. Please see pallet quantities below.

Thickness Sheets Per Pack Pack Coverage Number Of Packs
50mm 12 6.55m2 15
75mm 9 4.90m2 15
80mm 8 4.37m2 15
100mm 6 3.28m2 25

Upgrade your home's insulation with Rockwool Full Fill Cavity Batts, the perfect solution for cost-effective and reliable insulation in new cavity walls. These lightweight slabs are easy to handle and install, providing excellent thermal performance with a thermal conductivity (K value) of 0.037 W/mK. Designed to eliminate heat loss without compromising on water resistance, Rockwool Cavity Wall Insulation slabs are water repellent and help prevent condensation, making intermittent heating systems more effective. The fire classification of A1 ensures safety, and with an Agrément Certificate covering buildings up to 25m in height, these slabs are a versatile choice for various construction projects. With over 30 years of proven durability in all climates, Rockwool Cavity Wall Insulation slabs offer the assurance of a reliable and long-lasting solution.

At, we bring you Rockwool Full Fill Cavity Batts in all sizes to meet your specific insulation needs. BBA certified for all exposure zones, these slabs act as effective cavity barriers while providing outstanding thermal and fire insulation. The non-combustible Euroclass A1 rating ensures the highest level of safety. The slabs fit seamlessly against brick and blockwork, adapting to imperfections in the cavity wall, and require no timber cavity battens. With a commitment to health and safety, Rockwool fibers are confirmed as safe, meeting current HSE regulations. Choose Rockwool Full Fill Cavity Batts for a reliable, environmentally friendly, and superior insulation solution, available at to enhance your home's energy efficiency and comfort.

Key Features

  • Easy Installation: Lightweight and easy to handle for hassle-free installation.
  • Water Repellent: Prevents water transmission, reducing condensation risk.
  • Cost-Effective: Budget-friendly insulation without compromising quality.
  • Fire Safety: A1 fire classification for maximum safety.
  • Outstanding Thermal Performance: K value of 0.037 W/mK for effective heat loss reduction.
  • Versatile Use: BBA certified, suitable for various projects, and permitted in buildings up to 25m.
  • Durable: Proven over 30 years in all climates for long-lasting insulation.
  • Environmentally Friendly: No GWP or ODP, relying on entrapped air for thermal properties.
  • Superior Fit: Adapts to wall imperfections, providing a close fit.
  • No Timber Cavity Battens Needed: Fits seamlessly without additional supports.

Frequently Asked Questions

What are Rockwool Full Fill Cavity Batts used for? These insulation slabs are designed for insulating cavity walls in new constructions, providing a reliable solution to reduce heat loss.

Are Rockwool Full Fill Cavity Batts easy to install? Yes, these slabs are lightweight and easy to handle, making the installation process straightforward for builders and contractors.

How do Rockwool Full Fill Cavity Batts prevent water transmission? The slabs are water repellent, with oriented fibers that prevent water from crossing the wall construction, reducing the risk of condensation.

What sizes are available for Rockwool Full Fill Cavity Batts? The product comes in various thicknesses, including 50mm, 75mm, 80mm, 100mm, and 150mm, catering to different insulation needs.

Do Rockwool Full Fill Cavity Batts have fire safety certifications? Yes, these slabs achieve a reaction to fire classification of A1, ensuring the highest level of fire safety.

Can Rockwool Full Fill Cavity Batts be used in tall buildings? Yes, an Agrément Certificate covers their use in buildings up to 25m, with specific guidelines for different height ranges.

How long has Rockwool Cavity Wall Insulation been proven in service? Rockwool Cavity has been proven in service for over 30 years in various climates and degrees of exposure.

Are these slabs environmentally friendly? Yes, Rockwool insulation relies on entrapped air for its thermal properties, with no Global Warming Potential (GWP) or Ozone Depleting Potential (ODP).

Do Rockwool Full Fill Cavity Batts require additional timber cavity battens? No, these slabs fit seamlessly against brick and blockwork without the need for additional timber supports.

Where can I find more information about the health and safety aspects of Rockwool Full Fill Cavity Batts? Detailed information on health and safety, including Material Safety Data Sheet, is available from the Rockwool Marketing Services Department to assist in risk assessments.

    Technical Information

    Property Description
    Dimensions 455mm x 1200mm
    Thickness 50mm - 170mm
    Thermal Conductivity 0.037 W/mK
    Fire Properties Euroclass A1
    Water Repellency Water Repellent
    Vapour Resistivity Negligible
    Environmental Zero ODP & GWP
    Certification BS EN 13162, ISO 14001: 2004
    Standards BBA 94/3079 // KeyMark LPCB 022e // Kitemark KM06661
    Length 1200mm
    Width 445mm
    Thermal Conductivity 0.037 W/mK
    Material Type Rockfibre

    Est Delivery between and .

    Delivery will always take place on a weekday (Mon - Fri).
    For more information on delivery visit our delivery info page.

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