|Aspect||B-15 Replacement with complete LCA|
||The replacement module covers the complete replacement of components and building parts if their reference service life is lower than the reference study period.|
related study objective
|☒ stand-alone LCA||☒ comparative assertion|
related study phase
|goal and scope definition||inventory analysis (LCI)||impact assessment (LCIA)||interpretation||reporting|
|new buildings||existing buildings||construction products||screening LCA||simplified LCA||complete LCA|
|Provisions||The replacement procedure refers only to planned action in response to anticipated losses of performance of building components and building parts. Replacements should be considered when the reference service life (or eventual design life) of a product or building part is lower than the reference study period.A replacement scenario at the building scale should be determined on the basis of:
Building modifications in response to unexpected events (e.g. flood, inappropriate use or vandalism) should be considered as reparation (B3).
According to EN 15978, the boundary for replacement should include:
Water and energy usage related to the replacement process should always be included.
The frequency of replacement should be determined according to the ‘replacement frequency’ aspect of the present guide.
18.104.22.168 Boundary for replacement (Module B4)
8.3 Time related characteristics
8.6.3 Scenarios for maintenance, repair, replacement
6.3.3. Reference service life
22.214.171.124.2 – B4 Replacement
126.96.36.199 B1–B5 use stage related to the building fabric
||The overall replacement scenario should be consistent with respect to the building structure (e.g. replacement of coating is mandatory when replacing the support). In addition, LCA of existing building should take into account actual and established practices (real-life data) specific to that particular building.As replacement scenarios are based on the RSLs of building components and building parts, it should be noted that the RSL could be based on empirical, probabilistic or statistical data, and should always taking into account the intended use (description of use) as described in ISO 15686-1, -2, -7 and -8 [EN 15804, Annex A]. Furthermore, a component manufacturer cannot be held responsible for the actual design of the building or the use and application of the product, environment, workmanship or use[EN 15804, Annex A].Thus:
For an existing building, if a component has failed before its reference service life because of inappropriate maintenance, it may be considered as belonging to the repair module instead
For a new building, replacement frequency and more generally the replacement scenario should be based on service life planning and service life prediction, as described by ISO 15686 series [ISO 15686]. It should be noted that: service life planning can only address foreseeable changes. Since service life planning is concerned with foreseeable risks, it is not applicable to the estimation of obsolescence […] or to defective performance resulting from unforeseeable events or processes [ISO 15686-1, part B.8.2.]. Both cases may be accounted for in the case of existing buildings whenever specific data are available.
The progressive loss of performance of some components has an impact on the overall behaviour of the building (e.g. loss of performance of insulation may lead to an increase of energy demand due to heating). If sufficient data are available these aspects should be addressed by using a sensitivity analysis.