Fraunhofer Institute for Building Physics
Determination of dew water on the surface
Hygrothermics
| Measurement | Determination of dew water on the surface of exterior finishes caused by nocturnal long-wave radiation |
| Standard | Own testing method |
| Measurement object | Outside coatings like plaster or paint |
Technical data
| Sample size (H × W) | 50 × 50 mm |
| Indoor climate | +20 °C, 65 % r.h. |
| Dew-point temperature undercut | Typically 1.5 K |
Special features
- Determination of dew water on the surface by dabbing and weighing
- Dew-point temperature corresponding to the situation of outer walls in clear nights
More information
- Course of the surface water during a condensation period of several hours is decisive for the risk of microbial manifestation
- Typical testing time: 2 to 8 hours (without preparation)