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Material Sheet

Wall & Cavity Insulation

What is it used for

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Residential Construction

Used in the cavity walls of homes to improve thermal performance and reduce heating bills.

Commercial Buildings

Installed in the walls of commercial properties to enhance energy efficiency and meet building regulations.

Retrofit Projects

Ideal for upgrading the insulation in existing buildings, ensuring compliance with modern energy standards.

Brick Wall


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Length: Varies by product (typically 1200 mm to 2400 mm for boards)

Width: Varies by product (typically 450 mm to 1200 mm)

Thickness: Varies from 25 mm to 150 mm

Weight: Varies based on material and thickness; approximately 5 kg to 20 kg per board

What it’s Made From

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A common material for rigid insulation boards, offering lightweight and effective thermal insulation.

Polyurethane Foam

Provides excellent thermal insulation with high compressive strength, often used in spray foam applications.

Mineral Wool

Made from rock or slag fibers, it offers good thermal and acoustic insulation, and is fire-resistant.


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Polystyrene Cavity Insulation Board

Description: Lightweight, easy to handle, and provides effective thermal insulation.

Applications: Commonly used in residential and commercial wall cavities.

Polyurethane Foam Insulation

Description: Spray-applied foam that expands to fill cavities, providing superior thermal performance.

Applications: Ideal for irregularly shaped cavities and areas requiring high insulation values.

Mineral Wool Cavity Insulation

Description: Made from natural or recycled materials, offering excellent thermal and acoustic insulation.

Applications: Suitable for use in areas requiring fire-resistant and soundproof insulation.


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Tools Required

Trowel | Drill | Insulation blower (for loose-fill) | Utility knife

Materials Required

Wall & cavity insulation | Mortar mix | Fixings

Step-by-Step Guide:

  1. Preparation: Measure the wall area and cut the insulation material to fit.

  2. Drill Holes: Drill holes in the wall if using loose-fill insulation.

  3. Insert Insulation: Place rigid boards into the cavity or blow loose-fill insulation into the drilled holes.

  4. Seal Gaps: Ensure all gaps are filled and the insulation fits snugly.

  5. Fix Insulation: Secure the insulation with fixings if necessary.

  6. Finish: Check for any remaining gaps and ensure the insulation is properly installed.

Technical Specification

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Thermal Conductivity: 0.020 - 0.040 W/m·K

Fire Resistance: Mineral wool is non-combustible; polystyrene and polyurethane have varying degrees of fire resistance.

Moisture Resistance: Generally high, but varies by material.

Density: 20 - 150 kg/m³ depending on the material.


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BREEAM: Certification for sustainable building products.

Energy Star: Certification for energy efficiency.

ISO 14001: Environmental management standards certification.

Purchasing Quantities

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Single Units

Ideal for small projects, repairs, or when only a limited amount of insulation is needed.


Typically sold in bulk, with each pallet containing multiple boards or large quantities of loose-fill. This option is suitable for medium to large construction projects.


Smaller quantities than pallets, often sold in bundles of 2, 4, or 6 boards or bags of loose-fill, suitable for minor projects or additions.

Environmental Impact

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Sustainability Considerations

Some insulation products are made from recycled materials, such as recycled plastic in polystyrene boards.

Eco-friendly Alternatives

Mineral wool and natural fiber insulations are more sustainable options with lower environmental impact.

Waste Reduction

Insulation materials can often be recycled or repurposed at the end of their life cycle.

Energy Efficiency

Improves the thermal efficiency of buildings, leading to reduced carbon emissions and lower energy consumption.



Similar Materials

Natural Insulation
Natural Insulation


Insulation Board
Insulation Board


Loft Insulation
Loft Insulation


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