1.1 本试验方法涵盖了当水同时施加到室外面且室外面的静态气压高于室内面的压力（即正压）时，室外金属屋顶板系统对水渗透的抵抗力的测定。本试验方法是试验方法的专门改编 E331 . 1.2 该测试方法适用于任何屋顶区域，旨在仅测量与屋顶区域相关的水渗透，包括面板侧搭接和结构连接。它不包括开口或周边或任何其他细节处的泄漏。 1.3 该试验方法仅限于侧缝和附件清晰可见且泄漏源易于确定的试样。不容易确定来源的复合系统不在本试验方法的范围内。1.4 正确使用这种测试方法需要了解压力和流量测量的原理。 1.5 以英寸-磅单位表示的值应被视为标准值。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准。 1.6 本试验方法的正文参考了注释和脚注，不包括提供解释材料的表格和图表。这些注释和脚注不应被视为试验方法的要求。 1.7 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。有关具体危害声明，请参见 7.1 . 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 5.1 该测试方法是在均匀正静气压差下确定水渗透阻力的标准程序，并模拟施加在侧边的风驱动雨和在流动时建立水头时自由排出的雨。屋顶的坡度很大。在规定试验压差之前，应充分考虑这些因素。附注1: 在应用这种方法的测试结果时，请注意，屋顶或其部件或两者的性能可能是正确安装和调整的函数。在使用中，性能还取决于支撑结构的刚性、屋顶坡度，以及部件对各种原因劣化的抵抗力:腐蚀性气氛、老化、冰、振动、热胀冷缩等。很难模拟在使用中可能遇到的相同的复杂润湿条件，包括大的风吹水滴、随着风速的增加而增加的水滴冲击压力以及横向或向上移动的空气和水。一些设计比其他设计对这种向上流动的水更敏感。 附注2: 这是一个测试程序。指定机构有责任在考虑方法指南后确定样品结构、尺寸和测试压力。实际考虑表明，不需要为了证实产品性能而测试面板厚度、跨度和设计载荷的每个组合。 附注3: 该试验方法本身不应被用来形成关于水通过金属屋顶的整体渗透的结论。屋顶包含许多细节。尽管规定的修改超出了本测试方法的范围，但有经验的测试工程师能够使用本测试方法中提出的原理，并通过隔离特定细节和测量泄漏来生成重要数据。

1.1 This test method covers the determination of the resistance of exterior metal roof panel systems to water penetration when water is applied to the outdoor face simultaneously with a static air pressure at the outdoor face higher than the pressure at the indoor face, that is, positive pressure. This test method is a specialized adaption of Test Method E331 . 1.2 This test method is applicable to any roof area and is intended to measure only the water penetration associated with the field of roof including panel side laps and structural connections. It does not include leakage at openings or perimeter or any other details. 1.3 This test method is limited to specimens in which the side seams and attachments are clearly visible and in which the source of leakage is readily determined. Composite systems in which the source cannot be readily determined are outside the scope of this test method. 1.4 The proper use of this test method requires a knowledge of the principles of pressure and flow measurement. 1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.6 The text of this test method references notes and footnotes excluding tables and figures, which provide explanatory material. These notes and footnotes shall not be considered as requirements of the test method. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see 7.1 . 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is a standard procedure for determining the resistance to water penetration under uniform positive static air pressure differences, and simulates wind driven rain imposed on sidelaps and rain that is free to drain while building a water head as it flows. The slope of the roof is significant. These factors shall be fully considered prior to specifying the test pressure difference. Note 1: In applying the results of tests by this method, note that the performance of a roof or its components, or both, may be a function of proper installation and adjustment. In service, the performance also depends on the rigidity of supporting construction, roof slope, and on the resistance of components to deterioration by various causes: corrosive atmosphere, aging, ice, vibration, thermal expansion and contraction, etc. It is difficult to simulate the identical complex wetting conditions that can be encountered in service, including large wind-blown water drops, increasing water drop impact pressures with increasing wind velocity, and lateral or upward moving air and water. Some designs are more sensitive than others to this upward moving water. Note 2: This is a test procedure. It is the responsibility of the specifying agency to determine the specimen construction, size, and test pressures after considering the method’s guidelines. Practical considerations suggest that every combination of panel thickness, span, and design load need not be tested in order to substantiate product performance. Note 3: This test method shall not, by itself, be relied upon to form conclusions about overall water penetration through metal roofs. A roof contains many details. Although prescribed modifications are outside the scope of this test method, an experienced testing engineer is able to use the principles presented in this test method and generate significant data by isolating specific details and measuring leakage.