Embodied Carbon & Life Cycle Assessment: The Environmental Metrics of Volumetric Steel
Quantifying cradle-to-gate carbon emissions, 98% structural steel recyclability, zero-landfill factory production (EN 15978), and high-performance airtight envelopes in modular housing.
1. Cradle-to-Gate Life Cycle Assessment (LCA) According to EN 15978
As European operational energy codes tighten towards Net Zero Energy, the relative proportion of embodied carbon—the greenhouse gas emissions generated during raw material extraction, manufacturing, transport, and construction—has surged to represent over 50% to 70% of a modern building's whole-life carbon impact.
Under standard EN 15978 (Sustainability of construction works - Assessment of environmental performance of buildings), SERMODULA evaluates the upfront carbon stages (Modules A1 to A5). By utilizing optimized structural steel sections manufactured via Electric Arc Furnaces (EAF) with scrap steel feedstocks, upfront cradle-to-handover embodied carbon is reduced by 30% to 45% compared to conventional in-situ concrete frames. Every structural component is digitally tracked via BIM to provide verified Environmental Product Declarations (EPDs).
2. 98% Structural Steel Recyclability & Circular Economy Architecture
When a traditional concrete or masonry building reaches the end of its useful life, demolition creates hundreds of tons of crushed rubble and dust, the majority of which is downcycled into low-value aggregate or dumped into landfills with high carbon disposal overheads.
Structural steel is an infinitely recyclable permanent material. SERMODULA frames are engineered with bolted mechanical connections, allowing the modules to be either decommissioned and relocated intact or cleanly disassembled. At end of life, structural steel achieves a 98% global recycling efficiency rate without downgrading its metallurgical properties, returning directly into the circular economy as high-grade virgin-equivalent structural steel.
3. Factory Waste Minimization: Cutting Raw Material Scrap Below 2%
Traditional on-site construction is notoriously inefficient, routinely generating 15% to 25% material waste through offcut scraps, rain damage, broken tiles, surplus concrete pours, and damaged packaging, all consigned to site dumpsters.
In the SERMODULA controlled manufacturing facility, advanced nesting software guides automated CNC beam cutting saws, optimizing steel lengths to reduce mill cut-off scraps below 1.5%. Drywall, insulation, and cladding panels are precision-cut in dry indoor conditions. Residual gypsum and steel shavings are segregated at workstations for immediate recycling, eliminating wet sludge runoff and cutting raw construction material consumption.
4. Operational Energy Optimization & BREEAM / LEED Modularity Credits
Beyond upfront embodied carbon, volumetric modular architecture delivers superior operational carbon performance. Because vapor barriers, airtight tapes, and insulation envelopes are installed in dry factory conditions without awkward site scaffolding positions, envelope airtightness achieves exceptional test values (n50 <= 0.6 /h), meeting rigorous Passivhaus standards.
This airtightness, paired with thermal-bridge-free detailing, drastically reduces heating and cooling energy demands over the 50+ year operational life of the dwelling. Furthermore, modular buildings readily qualify for maximum points in green building certification frameworks: BREEAM (Responsible Sourcing and Waste Management), LEED v4 (Material Conservation and Life Cycle Impact Reduction), and DGNB (Deconstruction and Circular Economy).
Sustainability & Carbon Benchmark: In-Situ Concrete vs. Timber Frame vs. SERMODULA Volumetric Steel
Upfront Embodied Carbon (A1-A5)
End-of-Life Recyclability Rate
Construction Material Waste on Site
Airtightness Envelope Test (n50)
| Sustainability Metric | Traditional In-Situ Concrete | Cross-Laminated Timber (CLT) | SERMODULA Volumetric Steel (R16) |
|---|---|---|---|
| Upfront Embodied Carbon (A1-A5) | 420 – 580 kg CO2e/m² | 280 – 380 kg CO2e/m² | 250 – 320 kg CO2e/m² (EAF low-carbon steel) |
| End-of-Life Recyclability Rate | < 25% (mostly downcycled to low-grade gravel) | 50 – 70% (often burned for biomass energy) | >= 98% (infinitely recyclable without quality loss) |
| Construction Material Waste on Site | 15% – 25% sent to municipal landfills | 8% – 12% offsite/onsite cutoffs | < 1.5% (automated CNC nesting in factory) |
| Airtightness Envelope Test (n50) | 2.0 – 4.0 /h (typical leaky penetrations) | 1.0 – 1.5 /h | <= 0.6 /h (certified Passive House standard) |
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