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Biogenic Wall Systems for NZEB Single-Family Houses: Life-Cycle Carbon, Primary Energy Use and Architectural Implications

生物起源の壁システムによるNZEB一戸建て住宅: ライフサイクルカーボン、一次エネルギー使用量、建築的影響 (AI 翻訳)

Bartosz Dendura, Mateusz Budziakowski, Anna Bąk, Konrad Franczak

Buildings📚 査読済 / ジャーナル2026-05-01#炭素会計Origin: EU
DOI: 10.3390/buildings16091803
原典: https://doi.org/10.3390/buildings16091803

🤖 gxceed AI 要約

日本語

本研究は、炭素集約的なエネルギー環境におけるNZEB一戸建て住宅の外皮材料選択が環境に与える影響を、EN 15804+A2に基づくLCAで比較した。3つの壁システム（セラミック、無垢ログ、木材-ストロー）を同一の断熱性能条件下で評価し、生物起源材料はA1-A3モジュールで負のGWPを示したが、構造設計が資源効率に大きく影響した。木材-ストローシステムが最も資源効率が高く、無垢ログは炭素貯蔵に優れた。

English

This study compares the environmental impact of envelope material choices for NZEB single-family houses in a carbon-intensive energy context using LCA based on EN 15804+A2. Three wall systems (ceramic, solid log, timber-straw) were assessed under identical thermal performance. Biogenic materials achieved negative embodied GWP in modules A1-A3, but structural design significantly influenced resource efficiency. The timber-straw system was most resource-efficient, while solid log maximized carbon storage.

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

📝 gxceed 編集解説 — Why this matters

日本のGX文脈において

日本のZEH（ネット・ゼロ・エネルギー・ハウス）基準において、外皮の炭素収支評価はまだ発展途上である。本論文は木質系材料のカーボンストック効果を定量的に示し、日本の木造住宅におけるLCA手法や材料選択の参考となる。

In the global GX context

This paper contributes to the global discourse on building decarbonization by providing a controlled LCA comparison of biogenic envelope systems. It highlights the trade-off between carbon sequestration and resource efficiency, relevant for NZEB policies worldwide, especially in regions with carbon-intensive grids.

👥 読者別の含意

🔬研究者:Provides a controlled LCA comparison of biogenic wall systems, useful for methodology refinement in building carbon accounting.

🏢実務担当者:Offers quantitative guidance on material selection for low-carbon NZEB envelopes, balancing carbon storage and resource use.

🏛政策担当者:Demonstrates the carbon benefits of biogenic materials in building codes and the importance of considering structural efficiency in carbon calculations.

📄 Abstract（原文）

This study examines the environmental implications of envelope material choices for Nearly-Zero-Energy Building (NZEB) single-family houses in carbon-intensive energy contexts. Using a comparative Life Cycle Assessment (LCA) based on EN 15804+A2, a 100 m2 house was analysed over a 50-year lifespan across three archetypes: ceramic masonry (Design 1), solid log (Design 2), and timber–straw (Design 3). By maintaining a common steady-state thermal standard (U ≤ 0.20 W/(m2·K)) across all variants, the study provides a controlled comparison in which differences in GWP and non-renewable primary energy use primarily reflect material choices rather than insulation level. While both biogenic designs achieved negative embodied Global Warming Potential (GWP) in modules A1–A3 due to carbon sequestration, the results also show that structural concept and detailing strongly influence resource efficiency. Design 3 required substantially less timber volume than Design 2 while maintaining a comparable thermal standard and the lowest PENRT_A1–A3. Under the fixed operational assumptions adopted in this comparative study, module B6 remained the dominant single life-cycle contributor in all variants. The timber–straw system is therefore interpreted here as the more resource-efficient envelope strategy, whereas the solid-log solution primarily maximises timber-based carbon storage.

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