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Condensation
STRUCTURE & PHYSICSintermediate
Definition
The process by which water vapour in air turns into liquid water when it contacts a surface below the dew point temperature. Interstitial condensation — within the fabric of a wall — can cause structural damage and mould. Building details must manage vapour flow to prevent moisture accumulation within the construction.
Example
Poorly insulated cold bridges around window frames commonly lead to surface condensation and black mould growth in older flats — a health risk that affects millions of UK tenants.