|Aspect||B-14 Replacement with simplified 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. Replacement is mandatory for a limited set of building parts and components in the context of a simplified LCA.|
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.The replacement scenario should cover at least the elements in the following list (item marked with a * are suggested):
The replacement of load-bearing structure, exterior and basement walls, floor slabs and foundation should not be considered unless justified, as it usually entails significant building modification.
In any case the boundaries of the maintenance scenario should be clearly stated.
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), and are thus optional in the context of a simplified LCA.
According to EN 15978, the boundary for replacement should include:
However, in the context of a simplified LCA, only the production of the replaced component need be included.
The frequency of replacement may be determined according to the ‘replacement frequency’ aspect of the present guide.
||EN 15978:220.127.116.11 General
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 an 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].
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.