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Free building health diagnostic
Answer a few questions, photograph the problem properly, and get an indicative diagnosis with the evidence behind it. No account needed, and nothing is withheld if you decline one at the end.
Three questions
Age, symptom, location. Live dew point reading returned immediately.
Baseline
Four short groups covering what a certificate cannot tell us: symptoms, occupancy, heating, and what has been done to the building.
Photographs
A guided list of eight shots, each with a reason. GPS data stripped from every image on upload.
Your report
Mechanism, evidence, what is ruled out, free things to try, honest gaps, and sources.
Outil gratuit, sans compte
Vos murs vont-ils moisir dans les conditions d'aujourd'hui ?
Calculé à partir de la météo en direct de votre secteur et des conditions intérieures de votre logement, selon la méthode de la norme BS EN ISO 13788. Aucune hypothèse n'est faite sur votre bâtiment.
Votre thermostat ou un thermomètre d'ambiance.
Relevée à l'hygromètre. Ils coûtent quelques euros et constituent l'objet le plus utile à posséder en cas d'humidité.
Reading current conditions for Gibraltar...
Comment le calcul est fait
Saturation vapour pressure from the Magnus formula, published with an uncertainty under 0.6% between -45 and +60°C. Dew point and the mould threshold are derived from it by inversion.
The mould threshold is the surface temperature at which surface relative humidity reaches 80%, the default critical value in BS EN ISO 13788. Required fRsi is (threshold minus outdoor) divided by (indoor minus outdoor), compared against the 0.75 minimum UK regulations set for dwellings.
Nothing is assumed about your building. The tool reports the wall quality your conditions would demand, not a guess at the wall you have. Indicative screening only, not a survey, and no substitute for measurement at the affected surface.
Steps 2 to 4 are not built yet. The full flow, including guided photo capture and a branching report, is prototyped in design/greencode-platform-demo.html. Before it can ship it needs the validated model, PI insurer sign-off on wording and thresholds, a completed DPIA and a staffed escalation route. See DEVELOPMENT.md Phase 3 and 4.
Prefer to talk to someone?
If the situation is urgent, or you already know you need a survey, skip the tool.