Materials & Renders

Cavity Wall Insulation

"Retrofit insulation blown or injected into the gap between the outer and inner leaves of a masonry cavity wall. Standard UK energy-efficiency measure."

In detail

Typical materials: mineral wool, polystyrene beads, or polyurethane foam. On exposed coastal and west-facing walls, poorly-installed CWI can cause damp bridging; specialist inspection is advised before repainting over affected walls.

Synonyms & Related Terms

CWI Cavity insulation

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