Condensation & Mould Risk Calculator
Estimate dew point, moisture loading and localized surface water activity for RICS Home Survey and HHSRS damp & mould hazard assessments.
Atmospheric Readings
Measure the coldest structural surface (e.g. window reveal or corner wall).
Condensation will form on any surface at or below this temperature.
Environmental metrics are within typically safe thresholds.
How to use this in a survey
Dew point and surface water activity (aw) are the core indicators of condensation-driven damp. Mould requires a sustained elevated surface aw; liquid condensation forms once a surface reaches the dew point. Surveyors record the coldest accessible surface (window reveals, external corners, behind furniture) against room air temperature and RH.
Damp & mould growth is assessed under the Housing Health and Safety Rating System (HHSRS). BS 5250 is the UK code of practice for controlling condensation in buildings. This tool is for planning/triage and is not a substitute for a professional inspection.
Capture psychrometrics on-site. Automatically.
PropertySurvey Pro™ logs air temperature, relative humidity and surface readings natively offline and outputs standards-referenced RICS reports instantly.
