Internal Wall Insulation (IWI) is a method of insulating the interior walls of a building to improve thermal performance and energy efficiency. Unlike External Wall Insulation (EWI), which involves insulating the exterior walls, IWI involves adding insulation material to the inside of the building envelope. The process of installing internal wall insulation usually involves fixing insulation boards or panels to the interior surface of the external walls. These insulation materials are then covered with plasterboard or other finishing materials to create a smooth and aesthetically pleasing surface.

IWI is commonly used in buildings where it is not feasible or practical to insulate the exterior walls, such as in buildings with heritage or architectural significance. It can also be used in conjunction with other insulation measures, such as loft insulation and double-glazed windows, to improve overall energy efficiency. While IWI can help to reduce heat loss and improve thermal comfort within a building, it may also have some drawbacks. For example, it can reduce the usable floor space within rooms, and it may not address issues such as thermal bridging or moisture ingress as effectively as external insulation methods.

Before installing internal wall insulation, it’s important to assess the building’s suitability and consider factors such as moisture control, ventilation, and compatibility with existing building elements. Proper installation and detailing are crucial to ensure that the insulation performs effectively and does not cause any unintended consequences, such as condensation or mold growth.

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