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. A diagnosis requires an appropriately competent person to inspect the building, interpret the evidence and take responsibility for the conclusion; DampApp Pro can structure and report that work.

Back to Homepage

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 (England)

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

Awaab’s LawAwaab’s Law timescales (England)

Awaab’s Law Scotland Timeline Calculator

Investigation, written summary and repair deadlines for social and private landlords in Scotland from 6 October 2026, skipping Scottish bank holidays.

ScotlandSSI 2026/173 timescales

IAQ Monitoring Dashboard

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

IAQIndoor air quality

For an independent surveyor, see how faster field reporting can support a dated case record in our Awaab's Law reporting ROI guide.

Frequently Asked Questions

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

DampApp Pro helps independent surveyors capture psychrometric readings, moisture mapping and photos on-site, then prepare an editable report for professional review.

Scan with Mobile

Scan with phone camera to download DampApp Pro instantly.