Rain intrusion rates at façade details - A summary of results from four laboratory studies
Paper i proceeding, 2017

More knowledge and realistic data on inward leakage is needed not only to better understand and confirm rain resistance of different facades, but also to carry out reliable theoretical moisture risk assessments of façade details in external walls. This article is an attempt to highlight amounts of expected leakage based on four laboratory studies. The results show that under heavy driving rain conditions, there may be continuous point leakage of significant volumes of water (0,01-0,05 l/min) in small invisible deficiencies, and corresponds to up to 2% of the applied water load. The leakage rate also depends, more or less, on the size, position and geometry of the deficiency, cumulative runoff rates, size of projecting details and surface properties.


EN 12865

rain intrusion


risk assessment

building envelope

water lekage

Driving rain


Lars Olsson

Arkitektur och samhällsbyggnadsteknik

Energy Procedia: 11th Nordic Symposium on Building Physics, NSB 2017; Trondheim; Norway; 11 June 2017 through 14 June 2017

1876-6102 (ISSN)

Vol. 132 387-392





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