Will your wall stay dry after you insulate it? Draw it layer by layer, pick your place, and see in seconds — with the fix if it fails.
In App Review now. One purchase for iPhone, iPad and Mac.
iPhone and iPad with iOS 16 or later · Mac with macOS 12 or later · Apple silicon and Intel




Start from an example close to yours and change materials and thicknesses with a tap. 67 building materials with typical values; type in your product's data sheet values.
Safe, Acceptable or At risk, with the reason in plain words: where water condenses, how much, in which months, and whether summer dries it out.
The vapour retarder a wall needs and where, or the insulation that keeps the inside surface free of mould. One tap adds it and shows the new result.
The climate of any place in Europe and North America: by your iPhone's location (it stays on the device) or by coordinates, with the house's elevation. Or one of 221 cities.
From a bedroom to a bathroom; enter the humidity you measured, and see the humidity your wall tolerates and what to do day to day.
U-value by EN ISO 6946; mould and condensation by EN ISO 13788, month by month, with the limits of DIN 4108-3. English, German and Romanian.


Anyone insulating or renovating a house, and the energy auditors, installers and architects who advise them.
No. It is a check by the methods of the European standards that helps you decide. For capillary-active inside insulation or critical cases, ask for a hygrothermal simulation (WUFI, Delphin).
No. The climate data is inside the app; your location only picks the right grid points, on your device. The app makes no internet connection.