Glossary term

Dew point

Temperature at which air becomes saturated and water vapour can condense on a surface.

Updated 2026-08-30

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Sources and evidence

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2 technical/authority sourcesUpdated 2026-08-30

Technical checkpoints

1warm/humid summer weather
2dew point and surface temperature
3actual air-change path
4condition of the substrate
5intended use of the room
6changes after rain

Relevant guides

Condensation on basement windows

Condensation on basement windows. Start by documenting dew point and surface temperature, condition of the substrate and actual air-change path. The purpose is to understand the building condition and constraints before choosing products, finishes or a work sequence.

Monitoring basement humidity

Monitoring basement humidity. Start by documenting dew point and surface temperature, actual air-change path and intended use of the room. The purpose is to understand the building condition and constraints before choosing products, finishes or a work sequence.

Relevant real cases

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