Supply Chain Advice Pack: Delivering cavity wall extraction
Introduction
CWI extraction is the process of removing insulation materials (such as mineral wool, foam, or polystyrene beads) from the cavity space between a property’s inner and outer walls. The primary purpose of CWI extraction is to protect the building fabric and occupants by removing a material that is no longer appropriate for the dwellings context or condition. It is often a necessary enabling measure to allow a property to progress safely through a whole dwelling retrofit plan, particularly where further energy efficiency measures, such as internal wall insulation, external wall insulation, or ventilation upgrades, are proposed.
This advice pack explains how Cavity Wall Insulation (CWI) extraction is delivered in practice. It is written for the retrofit supply chain, including installers, specialist extraction contractors, site managers and PAS‑defined roles delivering government‑funded retrofit projects.
Download the PDF below to access this Advice Pack.
Readers that would like this document in a more accessible format should contact rise@turntown.co.uk.
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