1.1 本规范涵盖了非石棉纤维毡增强水泥基衬垫单元，该单元制造成尺寸稳定且适合作为未完工基底（见 注1 )或在潮湿和干燥地区用作墙壁、地板或甲板上的装饰基底，如天然石头或瓷砖。它也适用于用作PB级外部绝缘饰面系统应用中的基材（实践 C1397 )，直接应用饰面系统的应用（实践 C1516 )，以及PI级外保温饰面系统的应用（实践 C1535 )。 注1: 当用作未完成的基板时，请参阅制造商的书面安装文献以了解正确的应用细节。 1.2 本规范不适用于石棉水泥平板（规范 C220 )；外覆层、外墙、幕墙和拱腹等外部应用的非石棉纤维水泥平板（规范 C1186 )；石膏背板、芯板和井壁（规范 C1396/C1396M )；防水石膏背板（规范 C1396/C1396M )；玻璃垫石膏背板（规范 C1178/C1178M )；刨花板（定义 D1554 )；和离散非石棉纤维水泥内部基板（规范 C1288 )。 1.3 单位-- 以英寸-磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《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。

1.1 This specification covers non-asbestos fiber-mat reinforced cementitious backer units manufactured to be dimensionally stable and suitable as either an unfinished substrate (see Note 1 ) or as a substrate for decoration such as natural stone or tile on walls, floors, or decks in wet and dry areas. It is also suitable to be used as a substrate in the Application of Class PB Exterior Insulation Finish Systems (Practice C1397 ), the Application of Direct-Applied Finish Systems (Practice C1516 ), and the Application of Exterior Insulation Finish Systems Class PI (Practice C1535 ). Note 1: When used as an unfinished substrate, consult the manufacturer's written installation literature for proper application details. 1.2 This specification is not applicable to asbestos-cement flat sheets (Specification C220 ); non-asbestos fiber-cement flat sheets for exterior applications such as claddings, facades, curtain walls, and soffits (Specification C1186 ); gypsum backing board, coreboard, and shaftliner (Specification C1396/C1396M ); water-resistant gypsum backing board (Specification C1396/C1396M ); glass mat gypsum backing board (Specification C1178/C1178M ); particle boards (Definitions D1554 ); and discrete non-asbestos fiber-cement interior substrate sheets (Specification C1288 ). 1.3 Units— 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. 1.4 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.