New algorithm for water leakages flow through rain screen deficiencies
Paper i proceeding, 2018
calculation of water leakages through rain screen deficiencies. The algorithm is based on empirical values from many measurements according to standardized test method and validation. Even though the leakage process is very complicated, simple correlations have been shown. The leakages flow rate through deficiencies are mainly limited by the runoff rate and the catch area above the hole and around the hole with dam. Apart from wind pressure as a driving force, the inlet of the holes is often on a higher level than the outlet at the rear of the façade, which creates significant hydrostatic pressure, which can be elevated by impoundment at the obstacle. This is the main reasons to comprehensive water leakages through façades
without any wind pressure (pressure equalized façades). If precise information about defects data is not available, there are extensive measurements
supporting the following assumption – a realistic leakage flow for a small or invisible spot leakage at a façade detail is presumed to be 0.5 to 2% of the runoff rate per meter of façade width. If there are multiple penetrations or obvious defects in the façade design in combination with the dams, a significantly higher proportion of the runoff flow can leak in.
mechanisms of water leakage
RISE Research Institutes of Sweden
Chalmers, Arkitektur och samhällsbyggnadsteknik, Byggnadsteknologi
Proceedings of the 7th International Building Physics Conference, IBPC2018, Syracuse, NY, USA, 23-26 September 2018
Syracuse, NY, USA,
Riskanalyser av nya innovativa fasadsystem för renovering av miljonprogrammets byggnader
Svenska Byggbranschens Utvecklingsfond (SBUF) (17003595-7008), 2013-09-01 -- 2016-09-30.
Building Futures (2010-2018)