Are these damp tools free?

Yes. Every DampApp Pro calculator is free to use with no account, no sign-up and no data collection. Each runs in your browser.

Which standards do they follow?

They are standards-based: BS 5250 and psychrometrics (dew point), BS EN ISO 13788 / ISO 6946 (U-value & interstitial condensation, Glaser method), Approved Document F (ventilation), and Awaab’s Law timescales (damp & mould response).

Do the tools work for international projects?

The psychrometric and Glaser tools are universal and the U-value tool can pull live climate data for any location worldwide; ventilation figures follow UK Approved Document F. All tools support metric units.

Are they a substitute for a damp survey?

No. They are screening and calculation aids for surveyors, landlords and social-housing teams. For a full diagnosis and report, use the DampApp Pro app.

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Free Damp & Condensation Tools

A standards‑based toolkit for damp surveyors, landlords and social‑housing teams. Every tool runs in your browser and supports the science behind condensation, mould and moisture.

No login No data collection PDF export Live global climate data

Dew Point Calculator

Dew point, vapour pressure, absolute humidity and surface water activity from air temperature and RH.

BS 5250Psychrometrics / BS 5250

U-value & Interstitial Condensation Risk Calculator

Glaser method: U-value, layer build-up, condensation plane and 12-month moisture balance with live climate data.

ISO 13788BS EN ISO 13788 / ISO 6946

Hygrothermal Moisture Risk Calculator

Simplified hourly transient moisture / hygroscopic-buffering screening model across multiple zones.

HourlyTransient hygrothermal screening

Ventilation Rate Calculator

Kitchen/bathroom/utility/WC extract rates and air changes per hour against UK Approved Document F.

Part FApproved Document F

Awaab’s Law Timeline Calculator

Works out the statutory investigation and repair deadlines for a reported damp & mould hazard.

Awaab’s LawAwaab’s Law timescales

IAQ Monitoring Dashboard

Indoor air quality reference for temperature, relative humidity, CO₂ and VOC thresholds.

IAQIndoor air quality

Frequently Asked Questions

The tools are free. The full survey is in the app.

DampApp Pro captures psychrometric readings, moisture mapping and photos on-site and outputs RICS-aligned reports — useful evidence for Awaab's Law and Decent Homes duties.

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