Moisture measurement (building moisture on facades)

The aim is to reliably assess moisture penetration, water absorption, and drying behavior in plaster, masonry, concrete, natural stone, and coatings.
In practice, indicative in-situ measurements are combined with standardized reference/laboratory methods. DIN 4108-3 applies to building physics assessments in Germany.

How is it tested? (typical procedure)
Orientation measurements (e.g., electrical/capacitive) for mapping damp zones. In situ detection of water absorption with test tube (Karsten principle) according to DIN EN 16302 – suitable for porous, inorganic building materials.

Laboratory/reference:
Moisture content determined by drying (kiln drying method) in accordance with DIN EN ISO 12570;
depending on the issue at hand, additional capillary water absorption coefficient in accordance with DIN EN ISO 15148 and – for coatings – water vapor permeability in accordance with DIN EN ISO 7783. The results are included in the verification in accordance with DIN 4108-3.

Relevant standards (selection)

• DIN EN 16302 – Measurement of water absorption at low pressure (in situ/laboratory).
• DIN EN ISO 12570 – Determination of moisture content by drying.
• DIN EN ISO 15148 – Determination of the capillary water absorption coefficient.
• DIN EN ISO 7783 – Water vapor permeability (cup method) of coatings.
• DIN 4108-3 – Climate-related moisture protection: requirements, calculation, evaluation.