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Cavity Wall Insulation

With leading brands such as Kingspan and Rockwool cavity wall insulation, our comprehensive range includes rolls, slabs, and cavity boards – all designed to cut heating costs. Discover our products for unmatched energy efficiency, better eco-friendly credentials and long-term savings.

Explore our range of insulation for cavity walls

  •

    Celotex CW4000

    Celotex CW4000 is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing. Available in thicknesses from 40mm to 100mm, it can be considered for use in partial fill cavity wall applications.
    Select options This product has multiple variants. The options may be chosen on the product page Details

  • EcoTherm Eco-Cavity

    Fibre free rigid polyisocyanurate (PIR) insulation core with aluminium foil composite to both sides. The boards are conveniently sized to co-ordinate with brick and block dimensions and allow the insertion of wall ties at the appropriate spacing.
    Select options This product has multiple variants. The options may be chosen on the product page Details

  • EcoTherm Eco-Cavity Full Fill

    Fibre free rigid polyisocyanurate (PIR) insulation core with aluminium foil composite to both sides. Engineered jointing system for superior fit.
    Select options This product has multiple variants. The options may be chosen on the product page Details

  • Kingspan Kooltherm Cavity Closer

    Premium performance insulated cavity closer

    Select options This product has multiple variants. The options may be chosen on the product page Details

  • Kingspan Thermabate

    High performance insulated cavity closer

    Select options This product has multiple variants. The options may be chosen on the product page Details

  • KNAUF INSULATION GLASS MINERAL WOOL – DRITHERM® CAVITY SLAB 32

    DriTherm® Cavity Slab 32 is a water-repellent Glass Mineral Wool slab, designed for use in external full-fill masonry cavity walls, that offers the best thermal performance in the range. It is non-combustible with the best possible Euroclass A1 reaction to fire classification, and is manufactured using Knauf Insulation's unique bio-based binder, ECOSE® Technology.
    Select options This product has multiple variants. The options may be chosen on the product page Details

  • MANNOK THERM CAVITY / MC PIR INSULATION​

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  • ROCKWOOL® Full Fill Cavity Batts

    ROCKWOOL® Cavity Batts make a great solution for new builds or extensions – from homes to commercial. The non-combustible, fire resistant solution has been developed for the requirements of new build construction and contains water repellent additives.
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  • Rockwool® Full Fill Cavity Batts

    Protection against rainy days Cavity insulation is essential to provide weather-tight protection against inclement weather. The potential for damage caused by moisture can compromise insulation performance, so the ROCKWOOL® Full Fill Cavity Batts provide a great, water resistant solution for new build or extension projects.
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  • Rockwool® High Performance Partial Fill Cavity Slab

    The sky’s the limit Buildings, whether residential or commercial, require effective insulation to keep the weather out and importantly, the heat in. The ROCKWOOL High Performance Partial Fill Cavity Slab has been developed to provide effective thermal insulation for both masonry and frame constructions.
    Select options This product has multiple variants. The options may be chosen on the product page Details

  • Superglass Superwall 32 Cavity Wall Batt

    Superglass Superwall 32 is a British Board of Agrément (BBA) approved, non-combustible glass mineral wool insulation cavity wall batt. Designed to provide thermal insulation in full or partial fill in new external masonry cavity walls.
    Select options This product has multiple variants. The options may be chosen on the product page Details

  • Superglass Superwall 34 Cavity Wall Batt

    Superglass Superwall 34 is a British Board of Agrément (BBA) approved, non-combustible glass mineral wool insulation cavity wall batt. Designed to provide thermal insulation in full or partial fill in new external masonry cavity walls.
    Select options This product has multiple variants. The options may be chosen on the product page Details

Finding the best cavity wall insulation

Not sure what type of wall insulation you need? Well, if your building was constructed post-1930s and the brickwork is presented on its long side, rather than an alternating long-short pattern, chances are it has cavity walls. Given all the boxes are ticked, cavity wall insulation is a great option for insulating your property. Here’s what you need to know before you buy:

Choosing the right insulation material

The best cavity wall insulation for you will depend on a few factors. This includes choosing the right material and form, which you’ll need to consider your climate conditions and therefore your thermal performance needs, as well as cavity wall insulation cost considerations. With lots of options, it’s best to chat to a specialist to find the best fit:

  • Mineral wool fibre: Can be made from stone, slag, and molten glass. It’s cost-effective and easy to install.
  • Sheep’s wool: An eco-friendly option with properties similar to mineral wool.
  • Rigid insulation boards (PIR): Excellent for heat retention and moisture resistance.
    Polystyrene beads: Lightweight, durable, and budget-friendly.

Types of external cavity wall insulation

Cavity wall insulation slabs are ideal for flat surfaces requiring coverage, offering thermal and acoustic insulation, water repellency, and fire resistance.

Rolls are perfect for uneven surfaces or around obstacles like pipes, providing effective heat insulation and sound absorption. However, they can require additional fixtures like insulation supports to prevent movement, so make sure to keep that in mind.

Benefits of insulating your cavity walls

There’s numerous advantages to ensuring your property is properly insulated. The most common reason why people wouldn’t get their cavity walls insulated is because of the expense. However, in the long-run, the investment is worthwhile, and should essentially pay for itself. Here’s our favourite benefits:

  • Energy savings: Reduces heat loss, meaning your property is more comfortable – lowering the amount of money spent on energy bills.
  • Environmental impact: Less heating needed means a smaller carbon footprint – great news for your business and our planet!
  • Mould prevention: Limits moisture passing through walls, reducing condensation and mould growth.

Ready to insulate your commercial space? Speak to our specialists today.

Frequently Asked Questions

Does cavity wall insulation cause damp?

Many people believe that cavities should not be filled as it could lead to damp bridging. However, this is a very small possibility. Where water penetration does occur, this is usually due to defects in the construction of the property and not due to the faulty or inappropriate installation of cavity wall insulation.

How much does cavity wall insulation cost?

Typical costs vary depending on the size of your building, and of course, the type of insulation material you choose. We have a wide range of materials, ranging from premium products to more budget-friendly options.

How long does cavity wall insulation last?

Cavity wall insulation generally lasts about 25 years. However, its longevity can be influenced by the quality of the materials and the standard of installation.

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