REQUIRED 先决条件
适用项目类型：New Construction 新建建筑 / Core and Shell 核心与外壳
影响领域（Impact Area Alignment）：
✓ Decarbonization 脱碳 — Quality of Life 生活质量 — Ecological Conservation and Restoration 生态保护与修复
To quantify the embodied carbon impacts of the project's structural, enclosure, and hardscape materials, identify the top sources of embodied carbon, and develop strategies to reduce embodied carbon through design, material selection, and specification.
量化项目结构、围护结构和硬景观材料的隐含碳影响，识别隐含碳的主要来源，并通过设计、材料选择和规范制定来制定降低隐含碳的策略。
| Project Type 项目类型 | Status 状态 |
|---|---|
| New Construction and Core and Shell 新建建筑与核心外壳项目 | Required 必需 |
Quantify the embodied carbon of the project's structural, enclosure, and hardscape materials using a lifecycle assessment (LCA) approach consistent with ISO 14040/44. The assessment must cover, at minimum, the cradle-to-gate (A1-A3) lifecycle stages.
使用与 ISO 14040/44 一致的生命周期评估（LCA）方法，量化项目结构、围护结构和硬景观材料的隐含碳。评估必须至少涵盖"摇篮到大门"（A1-A3）生命周期阶段。
| Assessment Scope 评估范围 | Description 描述 |
|---|---|
| Structure 结构 | Structural frame, foundations, floor systems, and load-bearing elements 结构框架、基础、楼面系统和承重构件 |
| Enclosure 围护结构 | Exterior walls, roofing, fenestration, and waterproofing 外墙、屋面、门窗洞口和防水 |
| Hardscape 硬景观 | Site paving, walkways, retaining walls, and other hardscape elements 场地铺装、人行道、挡墙和其他硬景观元素 |
Note on Scope 3 Emissions 范围三排放说明：The assessment should also consider the project's Scope 3 emissions — indirect emissions that occur in the project's value chain, including those from extraction and production of purchased materials.
评估还应考虑项目的范围三排放——发生在项目价值链中的间接排放，包括采购材料的开采和生产过程中产生的排放。
During the conceptual or schematic design phase, conduct a carbon hotspot analysis to identify the top three material contributors to the project's embodied carbon. This analysis enables early-stage design intervention to target the most impactful material choices.
在概念设计或方案设计阶段，进行碳热点分析，识别项目隐含碳排名前三的材料贡献者。此分析使得早期设计干预能够针对最具影响力的材料选择。
Projects may use free or commercially available carbon calculators to complete the assessment. Accepted tools include but are not limited to:
项目可使用免费或商业碳计算器完成评估。接受的工具包括但不限于：
Based on the results of the carbon hotspot analysis, develop and document embodied carbon reduction strategies. The strategies should identify specific design changes, material substitutions, and specification improvements that could measurably reduce the project's embodied carbon footprint.
基于碳热点分析结果，制定并记录隐含碳减排策略。策略应识别可以显著降低项目隐含碳足迹的具体设计变更、材料替代和规范改进。
Important: 重要说明：A Whole Building Lifecycle Assessment (WBLCA) is NOT required at this prerequisite stage. WBLCA is an option under MRc2: Reduce Embodied Carbon for projects seeking additional points. The prerequisite requires quantification and assessment — not a complete WBLCA.
在此先决条件阶段不要求进行全建筑生命周期评估（WBLCA）。WBLCA 是 MRc2：降低隐含碳 积分项下的一个选项，供追求额外积分的项目使用。先决条件要求的是量化和评估——而非完整的 WBLCA。
| Material 材料 | Reduction Strategies 减排策略 |
|---|---|
| Concrete 混凝土 | Specify low-carbon concrete mixes (supplementary cementitious materials, carbon-cured concrete) 指定低碳混凝土配合比（辅助胶凝材料、碳养护混凝土） |
| Steel 钢材 | Specify high-recycled content steel, electric arc furnace (EAF) production 指定高回收含量钢材、电弧炉（EAF）生产 |
| Mass Timber / Engineered Wood 重型木结构/工程木材 |
Consider mass timber as structural alternative; verify sustainable forestry certifications 考虑将重型木结构作为结构替代方案；验证可持续林业认证 |
| Insulation 保温材料 | Specify bio-based or high-recycled content insulation materials 指定生物基或高回收含量保温材料 |
| Project Type 项目类型 | Considerations 考量 |
|---|---|
| Core and Shell 核心与外壳 | Assessment scope limited to base building structure and enclosure; tenant fit-out materials are excluded. 评估范围限于基础建筑结构和围护结构；租户装修材料不包括在内。 |
| Schools 学校 | Include embodied carbon of modular classrooms and portable structures if part of the project. 如项目包含模块化教室和移动式建筑，须将其隐含碳纳入计算。 |
| Data Centers 数据中心 | Include embodied carbon of raised floor systems and equipment support structures. 包含架空地板系统和设备支撑结构的隐含碳。 |