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The purpose of this study was to measure the long-term moisture build-up in the walls of a house which had been retrofitted with Internal Wall Insulation. This was done by embedding moisture sensors in the walls and then monitoring values over an eight-year period. The results showed that the wall moisture of embedded wood piece sensors had increased to a value of 18–20 % over 8 years. In a comparable wall, which had been treated with water repellent brick cream, the build-up of moisture was significantly reduced to 9–10 % over the same period. This wall was examined after the 8-year period and no visible mould was evident.