5. Summary
5.1 Steam flow
Steam always flows from high temperature (or high pressure) to low temperature (or low pressure).
In the building industry, we often find that water in its liquid state is the original cause of proven pathologies. To avoid them, we need to check whether water vapour migrates through the coated wall in the vapour state, even and especially when the contractor and/or manufacturer describe the planned coating as "microporous paint".
SCROLL TO TOP5.2 Microporosity
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Standards and norms
New standards
- - NF EN ISO 7783-1 - 09.1999
- Détermination du coefficient de transmission de la vapeur d'eau. - NF EN ISO 7783-2 - 07.1999
The first describes the free-foil capsule method. The second determines and classifies water vapour transmission rate (permeability).
They now have the status of French standards and are part of the NF EN 1062-1 to 1062-11...
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