ISO 15927-3:2009

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SO 15927-3:2009 is an international standard focused on the hygrothermal performance of buildings, specifically addressing the calculation of a driving rain index for vertical surfaces. It provides procedures to estimate the amount of water impacting a wall, considering factors like topography, local sheltering, and building/wall type. The standard also calculates both an annual average index and a spell index, which helps assess the impact of rain penetration through different walling systems.