C-02 Demolition/deconstruction – complete LCA

Aspect C-02 Demolition/deconstruction – complete LCA
Description
The deconstruction and demolition stage involves quantification of the impact related to the end of life of the constructed system. For example, if it is a reinforced concrete building, deconstruction activity will consist mainly in separating the reinforcing steel from the concrete. During this operation, energy is consumed, and pollutants are emitted to the air. In this context, should the demolition and deconstruction stage be considered in the context of a complete LCA?

related study objective

stand-alone LCA comparative assertion

related study phase

goal and scope definition inventory analysis (LCI) impact assessment (LCIA) interpretation reporting

relevant for

new buildings existing buildings construction products screening LCA simplified LCA complete LCA
Provisions The demolition and deconstruction aspects should be included for a complete LCA. Generic or specific data should be taken from LCA databases or other relevant sources if available, unless they fall under cut-off rules.
Rules from:
EN 15978:
8.7.2 Scenarios for deconstruction – Module C1

EN 15804:
6.2.6 C1-C4 End-of-life stage information modules

Guidance
The practitioner should use detailed calculation (based on specific data) for a complete LCA. The energy, materials and related emissions of these processes should be included. However, very few LCA data are currently available in every national context. One option is to use existing generic LCA data on the impact of demolition and the deconstruction process (e.g. the impact of sorting the reinforcing steel from the concrete at the end of life of the building). Such generic LCA data can be found e.g. in the Ecoinvent database or in the Greenest Building, which provides indicative demolition energies for various building types (see exhibit 2). The practitioner should be aware that the data on demolition process may not be fully adapted to the context. Another option is to define generic data with stakeholders (collection of specific data). For most construction projects this aspect is likely to fall under the cut-off rules, and may be omitted.

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