Four case scenarios-definitions and differences regarding key CE parameters
| Feature | Scenario 1 | Scenario 2 | Scenario 3 | Scenario 4 |
|---|---|---|---|---|
| Site condition | New/undeveloped site | New/undeveloped site | Repurposed land (previous residential site) | Previously occupied site |
| Structural system | In-situ reinforced concrete frame | Prefabricated steel frame | Prefabricated glulam timber frame | Modular reuse of existing building |
| Foundation material | 0% recycled steel, no recycled concrete | 60% recycled steel, 3% recycled concrete | 90% recycled steel, 3% recycled concrete | 100% reused components (where applicable) |
| Wall assembly | Brick cladding, cement mortar | Steel sandwich panels, steel cladding | OSB, glulam, bio-based hempcrete | OSB and glulam, timber cladding |
| Insulation material | Glass wool (not disassemblable) | Mineral rock wool (disassemblable) | Bio-based sprayed hempcrete | Sheep’s wool batts (80% recycled) |
| Flooring | Nylon carpet, ceramic tiles | Nylon carpet (25% recycled), ceramic tile | Timber flooring, ceramic tiles (70% recycled) | Cork flooring (100% reused) |
| Design for disassembly | No modularity or adaptability (welded joints) | Some prefabrication, bolted steel joints | Modular glulam structure with repair-friendly connectors | Modular components with dry mechanical connections |
| Reuse and recycling | Minimal recycling (steel only), no reuse | Recycled content in steel and some finishes | High recycled content, bio-based and decomposable materials | Highest reuse/recycled materials across components |
| Waste scenarios | Most waste landfilled | Most waste landfilled, steel recycled | Reduced waste via prefabrication and bio-based decomposition | Take-back systems in place, reuse and recycling prioritized |
| Flexibility/Extendibility | None | Limited (some replaceable parts) | Designed for future repairs and replacements | Highly flexible, disassemblable, and reconfigurable |
| Feature | Scenario 1 | Scenario 2 | Scenario 3 | Scenario 4 |
|---|---|---|---|---|
| Site condition | New/undeveloped site | New/undeveloped site | Repurposed land (previous residential site) | Previously occupied site |
| Structural system | Prefabricated steel frame | Prefabricated glulam timber frame | Modular reuse of existing building | |
| Foundation material | 0% recycled steel, no recycled concrete | 60% recycled steel, 3% recycled concrete | 90% recycled steel, 3% recycled concrete | 100% reused components (where applicable) |
| Wall assembly | Brick cladding, cement mortar | Steel sandwich panels, steel cladding | OSB, glulam, bio-based hempcrete | OSB and glulam, timber cladding |
| Insulation material | Glass wool (not disassemblable) | Mineral rock wool (disassemblable) | Bio-based sprayed hempcrete | Sheep’s wool batts (80% recycled) |
| Flooring | Nylon carpet, ceramic tiles | Nylon carpet (25% recycled), ceramic tile | Timber flooring, ceramic tiles (70% recycled) | Cork flooring (100% reused) |
| Design for disassembly | No modularity or adaptability (welded joints) | Some prefabrication, bolted steel joints | Modular glulam structure with repair-friendly connectors | Modular components with dry mechanical connections |
| Reuse and recycling | Minimal recycling (steel only), no reuse | Recycled content in steel and some finishes | High recycled content, bio-based and decomposable materials | Highest reuse/recycled materials across components |
| Waste scenarios | Most waste landfilled | Most waste landfilled, steel recycled | Reduced waste via prefabrication and bio-based decomposition | Take-back systems in place, reuse and recycling prioritized |
| Flexibility/Extendibility | None | Limited (some replaceable parts) | Designed for future repairs and replacements | Highly flexible, disassemblable, and reconfigurable |
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