The performance and durability of wall assemblies are greatly affected by the moisture load to which they may be subjected, in particular those arising from Wind-Driven Rain (WDR). Standard approaches for estimating such moisture loads assume 1% of the WDR load, whereas these loads have also been assessed from watertightness tests, although these assumed loads have been determined based on limited climate information. To more accurately estimate the moisture loads to which wall assemblies may be subjected over their service life, an analysis of historical WDR loads was completed for 11 cities across Canada. The magnitude, probability of occurrence of WDR loads in different cities and correlations between WDR related climate parameters, are discussed in this paper. Also, a novel WDR severity index is introduced, referred to as the Wind-Driven Rain Pressure Index, to permit quantifying the real-time and simultaneously occurring effects of WDR intensity and Driving Rain Wind Pressure (DRWP). To estimate the WDR intensity and DRWP with a specific probability of occurrence, an Extreme Value Analysis (EVA) was completed for a climate dataset of 31 years (1986–2016) using the Generalized Extreme Value and Gumbel distributions.

壁组件的性能和耐用性受其可能承受的湿气负荷的影响很大，特别是那些因风雨引起的湿气负荷。估算此类水分负荷的标准方法假设为WDR负荷的1％，而这些负荷也已通过水密性测试进行了评估，尽管这些假设负荷是根据有限的气候信息确定的。为了更准确地估算墙壁组件在使用寿命期间可能承受的水分负荷，对加拿大11个城市的历史WDR负荷进行了分析。本文讨论了不同城市中WDR负荷的大小，发生概率以及与WDR相关的气候参数之间的相关性。此外，还引入了新的WDR严重性指标，称为“风雨压指数”，以量化WDR强度和行车雨风压（DRWP）的实时和同时发生的影响。为了估计具有特定发生概率的WDR强度和DRWP，使用广义极值和Gumbel分布对31年（1986-2016年）的气候数据集进行了极值分析（EVA）。