TS EN ISO 9346

TS EN ISO 9346 is a vocabulary standard for physical quantities associated with mass transfer in the context of buildings and building materials. It brings together the names, definitions, symbols and units of the core quantities used to describe hygrothermal behaviour, helping engineers, researchers and technical writers use the same terms in a consistent way.

In general technical terms, hygrothermal performance concerns the coupled behaviour of heat and moisture in building materials and assemblies. Mass transfer is part of that picture: moisture can move through materials by diffusion, capillary transport and related mechanisms, and those processes influence durability, comfort and the performance of envelopes and components. A shared vocabulary matters because calculations, specifications and reports depend on precise quantity names and units.

How the terminology is organised

According to the scope of this standard, the vocabulary covers buildings, building elements and systems, building components, and building materials. For the physical quantities included, the standard also gives the corresponding symbols and units. That combination is especially useful in engineering documentation, where the meaning of a quantity must be clear not only by definition but also by notation.

• Covers terminology for mass-transfer-related physical quantities in the building field.
• Includes buildings, building elements and systems, components, and materials.
• Provides corresponding symbols for the defined quantities.
• Provides corresponding units for the defined quantities.