Last edited 29 Mar 2021

Moisture in buildings

Condensation on glass.jpg

Moisture is the presence of water, often in small or even trace amounts. Moisture can be found in water vapour, condensation, and in or on the fabric of a building and can cause damp resulting in problems such as staining, mould growth, mildew and poor indoor air quality, and so on.

The common sources of moisture in buildings include:

Moisture levels can be reduced through a number of measures:

NB Technical paper 35: Moisture measurement in the historic environment, published by Historic Environment Scotland in 2021, defines moisture as: β€˜Water that is freely mobile as a liquid, gas (vapour), and solid (ice). All moisture is water, but not all water is moisture, as it is not necessarily freely mobile.’

It defines moisture content as: β€˜The quantity of moisture present within a material.’

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