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Internal wall insulation (IWI) is an insulation layer designed to prevent heat being lost from a home. It is normally used in older homes with solid walls where cavity wall insulation is not possible. Typically, insulation is laid between light-gauge steel channels or timber studs fixed to the inside of walls. The channels or studs are then most commonly covered by foil-backed plasterboard (or plasterboard with a separate vapour control layer). Alternatively, composite boards of insulation and plasterboard are glued and/or mechanically fixed to the main wall. A further approach relates to 'In-situ applied closed cell insulation' that can be applied directly to the wall, between the studwork, to any thickness depending on the insulation value required and the space available.
Unlike, external wall insulation, IWI does not affect the exterior appearance of the house, but it does slightly reduce room size. IWI is not as effective at insulating walls as external wall insulation.