Fraunhofer Institute for Building Physics
Water vapor transmission properties
Hygrothermics
| Measurement | Water vapor resistance factor, diffusion equivalent air layer thickness |
| Standards | DIN EN ISO 12572, DIN EN 12086, DIN EN ISO 7783-2, DIN 1931, DIN 53122-1, ASTM E 96-95 |
| Measurement object | Mineral materials like brick, lime stone, sandstone, concrete, plasters and renders, insulation materials, flexible sheets for waterproofing, roof underlays, etc. |
Technical data
| Sample size, circular | Diameter 90 mm, 100 mm, 200 mm |
| Sample size, rectangular (L × W) | 100 × 100 mm 200 × 100 mm 180 × 130 mm Special dimensions possible |
| Test condition | Dry cup: +23 °C, 0 to 50 % r.h. Wet cup: +23 °C, 50 to 93 % r.h. Special conditions available |
Special features
| Accredited by DAkkS D-PL-11140-11-02 |
The laboratory has a flexible accreditation according to DIN EN ISO/IEC 17025 Test laboratory moisture, mortar, radiation, emmissions |
| Test reports can be issued |
More information
The water vapor transmission of building materials is one of the most important characteristics to estimate moisture behavior of constructions. In particular prevention of condensation and the drying of constructions are controlled by the water vapor transmission properties.