Supply Chain Advice Pack: Internal Wall Insulation – Assessing and Design
Introduction
IWI involves applying insulation material to the internal face of a building’s external walls, typically finished with a plaster skim and decorative finish. It helps to improve energy efficiency by reducing the amount of heat escaping through external walls which, (Energy Savings Trust estimates up to 33%). IWI reduces thermal bridging, a common issue in older buildings, where heat is lost disproportionately though specific elements in the walls e.g. lintels.
IWI presents itself as a key measure to improve fabric performance where External Wall Insulation (EWI) may have been discounted for reasons such as cost, planning constraints, leaseholder issues, high rise blocks and access costs. IWI often is often the next option to be considered in terms of insulating walls. This typically applies to solid wall properties but can become relevant if narrow cavities are unsuitable for cavity wall insulation. This pack is part of an Internal Wall Insulation (IWI) series, the other packs can be found here.
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