1.1 本规程提供了适用的标准，而不考虑在整个建筑层面进行LCA以将最终的整个建筑设计与参考建筑设计进行比较时使用的评估（LCA）工具。 1.2 本规程的目的是支持在建筑规范、标准和建筑评级系统中使用整栋建筑生命周期评估（LCA），确保最终整栋建筑设计与参考建筑设计的比较评估考虑到相关建筑特征、生命周期阶段、建筑设计和建筑设计，以及同一建筑的参考和最终建筑设计的类似方式的相关活动。 1.3 该标准不涉及建筑占用者行为、建筑功能未来可能发生的变化、建筑修复或改造，或在设计或许可阶段无法预见或合理估计的其他事项，或在这两种情况下都适用。 1.4 本实践仅涉及环境影响和可持续性方面。本实践未涉及社会和经济影响以及可持续性方面。 1.5 本规程不涉及引用的国际标准中涵盖的基本生命周期评价方法、计算方法或相关事项。 1.6 本规程不取代或修改产品层面LCA应用的现有ISO标准，也不涉及以下任何相关应用: 1.6.1 建筑产品环境产品声明（EPD）在整个建筑层面的汇总； 1.6.2 在建筑规范、标准或评级系统中应用EPD的规则；和 1.6.3 建筑产品EPD的可比性。 注1: ISO 14025和ISO 21930为建筑产品EPD的使用和可比性提供了指导。 1.7 本规程未规定建筑规范、标准或建筑评级系统中要处理的影响类别或可持续性方面，本规程的用户符合适用规范、标准和评级系统中规定的影响类别要求。 1.8 本标准文本包含提供说明材料的注释。这些注释不应视为本标准的要求。 1.9 本标准并不旨在解决与其使用相关的所有安全问题（如有）。 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，并确定监管限制的适用性。 1.10 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 本规程提供了建筑设计团队应使用的标准，以比较参考建筑设计和最终建筑设计相关的环境影响，包括对现有建筑的补充（如适用）。 5.2 本规程特别涉及初始施工的材料选择，包括在假定使用寿命内的相关维护和更换周期，如果适用规范、标准或评级系统要求或明确允许，则考虑运行能耗。

1.1 This practice provides criteria to be applied irrespective of the assessment (LCA) tool that is used when LCA is undertaken at the whole building level to compare a final whole building design to a reference building design. 1.2 The purpose of this practice is to support the use of whole building Life Cycle Assessment (LCA) in building codes, standards, and building rating systems by ensuring that comparative assessments of final whole building designs relative to reference building designs take account of the relevant building features, life cycle stages, and related activities in similar fashion for both the reference and final building designs of the same building. 1.3 The criteria do not deal with building occupant behavior, possible future changes in building function, building rehabilitation or retrofit, or other matters that cannot be foreseen or reasonably estimated at the design or permitting stage, or both where this practice applies. 1.4 Only environmental impacts and aspects of sustainability are addressed in this practice. The social and economic impacts and aspects of sustainability are not addressed in this practice. 1.5 This practice does not deal with basic LCA methodology, calculation methods or related matters that are covered in cited international standards. 1.6 This practice does not supersede or modify existing ISO standards for the application of LCA at the product level, nor does it address any of the following related applications: 1.6.1 Aggregation of building products Environmental Product Declarations (EPD) at the whole building level; 1.6.2 Rules for applying EPDs in a building code, standard, or rating system; and 1.6.3 Comparability of building product EPDs. Note 1: ISO 14025 and ISO 21930 provide guidance on use and comparability of building products EPDs. 1.7 This practice does not specify the impact categories or sustainability aspects to be addressed in building codes, standards, or building rating systems and users of this practice conform to the impact category requirements specified in the applicable code, standard, or rating system. 1.8 The text of this standard contains notes that provide explanatory material. These notes shall not be considered as requirements of the standard. 1.9 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. 1.10 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 practice provides criteria that building design teams shall use to compare the environmental impacts associated with a reference building design and a final building design, including additions to existing buildings where applicable. 5.2 This practice deals specifically with material selection for initial construction, including associated maintenance and replacement cycles over an assumed service life, taking operating energy use into account if required or explicitly allowed under the applicable code, standard, or rating system.