山火事後の再建を脱炭素化する：耐火・低炭素壁アセンブリの比較LCA

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:建材のエンボディドカーボンと耐火性能を統合評価するLCA手法の実例として参考になる。

🏢実務担当者:山火事リスク地域での再建において、低炭素断熱材への置換がコストと耐火性を両立し得る選択肢となる。

🏛政策担当者:WUI建築コードにエンボディドカーボン指標を組み込む際の定量的根拠を提供する。

California's wildfire rebuilding cycles compound the state's climate crisis: conventional reconstruction materials carry significant embodied carbon burdens, re-emitting what fires destroy and perpetuating a feedback loop between fire risk and climate impact. Designers and homeowners rebuilding in Wildland–Urban Interface (WUI) zones currently lack quantitative guidance for choosing between conventional wall assemblies and low-carbon alternatives; existing resources address ignition resistance but rarely integrate embodied carbon metrics. This thesis compares conventional code-compliant exterior wall assemblies against low-carbon alternatives, including adobe, rammed earth, compressed earth block, hempcrete with CLT, cork-based hybrids, and mycelium-enhanced mass timber, evaluating fire performance alongside upfront embodied carbon. All assemblies were designed to R-20 per California Title 24 standards. A cradle-to-gate LCA (modules A1–A3) was performed using a functional unit of 1 sq ft over a 60-year service life, with GWP values drawn from EPDs across the One Click LCA, EC3, and 2050 Materials databases. Fire performance was assessed against ASTM E119 and E84 benchmarks. The largest carbon reductions were driven by insulation substitution: bio-based materials such as hempcrete, cork, and cellulose store biogenic carbon that offsets process emissions elsewhere in the assembly. Earth-based systems achieved near-zero embodied carbon by eliminating energy-intensive manufacturing almost entirely, while mass timber assemblies combined strongly negative biogenic carbon profiles with predictable char-layer fire protection. Even hybrid assemblies, retaining conventional framing while substituting low-carbon insulation, delivered meaningful reductions, suggesting low-carbon upgrades are viable across a range of budgets and construction contexts. Across all natural assemblies evaluated, fire resistance met or exceeded that of conventional WUI systems. Natural assemblies achieved embodied carbon reductions of 64-124% relative to the conventional baseline while meeting or surpassing conventional fire resistance. Mycelium composites show promise but lack standardized assembly ratings, leaving their WUI code pathway unresolved. Findings are translated into preliminary design guidelines for architects, builders, and policymakers navigating post-fire reconstruction. The thesis argues that fire safety and climate responsibility are not competing priorities; the materials needed to break the wildfire-carbon rebuilding cycle already exist.

• openalex https://doi.org/10.1184/r1/33170174.v1first seen 2026-09-24 04:41:26 · last seen 2026-09-24 04:41:27