Internal cavity wall insulation retrofits thermal material into the gap between outer and inner brickwork This process involves drilling small holes in the mortar joints and injecting insulating material such as foam beads mineral wool or polystyrene granules This fills the empty space creating a barrier that significantly reduces heat transfer through the wall
Installation Procedures and Materials
Specialist contractors typically undertake this work using specific equipment to ensure even distribution The choice of material depends on the cavity width and exposure to wind-driven rain Mineral wool is a common choice for its fire resistance and breathability while bonded bead systems offer good thermal performance and internal insulation cavity wall water drainage properties A pre-installation survey is crucial to check for existing damp or debris
Key Benefits and Necessary Considerations
The primary advantage is markedly improved thermal efficiency lowering heating costs and enhancing comfort It is often less disruptive than external insulation and preserves a building’s external appearance However it is only suitable for walls with a clear cavity and in good condition Incorrect installation can lead to cold bridging or moisture transfer so using certified professionals is essential for long-term performance