1.1 瓷砖屋顶系统的透气性是确定应用于屋顶的瓷砖屋顶抗风性的关键因素。本标准描述了根据制造商的说明测量粘土、混凝土瓦和板岩屋顶系统在应用于一小段屋顶板时的透气性的程序。 1.2 本测试程序测量未密封粘土或混凝土屋顶砖或板岩铺设阵列的透气性。瓷砖或板岩的厚度应在 1. / 8. -在中。（3-mm）和2-in。（51毫米）。 1.3 本试验方法的文本参考了注释和脚注，这些注释和脚注提供了解释性材料。这些注释和脚注（不包括表和图中的注释和脚注）不应视为本标准的要求。 1.4 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 由离散元件构成的屋顶系统的透气性，如粘土和混凝土瓦和板岩屋顶系统，是确定屋顶系统抗风性的关键因素。屋顶系统的抗风能力- 由于屋顶总成的整体透气性而产生的诱导扬压力与屋顶系统抵抗风引起的损坏的能力有关。 5.2 自然风条件在强度、持续时间和湍流方面有所不同；这些条件超出了本试验方法模拟的范围。

1.1 The air permeability of tile roofing systems is a critical factor in determining the wind resistance of tile roofing as applied to a roof. This Standard describes a procedure for measuring the air permeability of clay and concrete tile and slate roof systems when applied to a small section of roof deck in accordance with the manufacturer's instructions. 1.2 This test procedure measures the air permeability of a laid array of unsealed clay or concrete roof tiles or slates. The tiles or slates shall have a thickness between 1 / 8 -in. (3-mm) and 2-in. (51-mm). 1.3 The text of this test method references notes and footnotes, which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.4 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. 1.5 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. 1.6 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 The air permeability of roofing systems constructed from discrete elements, as is the case for clay and concrete tile and slate roof systems, is a critical factor in determining the wind resistance of the roof system. The ability of the roof system to relieve wind-induced uplift pressures as a result of the overall air permeability of the roof assembly relates to the resistance of the roof system to damage induced by wind. 5.2 Natural wind conditions differ with respect to intensity, duration, and turbulence; these conditions are beyond the means of this test method to simulate.