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The Damp And Mould Assumptions The Sector Can’t Afford To Rely On Anymore

28/05/2026

By Christopher Thomas, Director at ArcAirTech

Damp and mould have been talked about for years, but there’s still a lot of confusion around what actually causes them. This results in the same patterns showing up, issues being treated, then coming back, and in some cases, the wrong things (or people) being blamed. 

The challenge isn’t a lack of effort. It’s that much of that effort is built on assumptions that don’t fully reflect how mould develops and behaves, and as expectations continue to shift, from response to evidence, from action to outcome, those assumptions are starting to fall short. 

Some of those assumptions are easy to recognise, they show up in the way damp and mould is explained, and in the approaches taken to deal with it. 

Take ventilation, for example. 

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