This part of EN 927 specifies a test method for assessing the liquid water permeability of coating systems for exterior wood.
BS EN 927-5:2006 Referenced Document
ISO 554 Standard atmospheres for conditioning and/or testing; Specifications
BS EN 927-5:2006 history
1970BS EN 927-5:2023 Paints and varnishes. Coating materials and coating systems for exterior wood Assessment of the liquid water permeability (British Standard)
2008BS EN 927-5:2006 Paints and varnishes - Coating materials and coating systems for exterior wood - Part 5:Assessment of the liquid water permeability