Demolition, delayed start and renovation: which function should you use?
LCAbyg has several settings that resemble each other but do something different to how a building product is calculated in the building model. If the wrong one is chosen, the result can be wrong without it being obvious in the calculation.
| Situation | Function | What it does |
|---|---|---|
| An existing building product is removed from the building | Demolition | Skips A1-A3, moves the disposal to the start year, see Demolition of existing building products |
| A building product is only installed later in the study period | Delayed start | Moves A1-A3 to the specified year, see Delayed start |
| An existing building product is demolished and a new one is put up later in the period | Demolition + delayed start combined | The disposal is moved to the delayed year, see Demolition of existing building products |
| A building product’s data should not count towards the result | Reuse enabled | Zeroes the building product’s environmental impact in every module |
The renovation flag zeroes everything
Section titled “The renovation flag zeroes everything”The renovation flag on a building product is not a marker that the building product forms part of a renovation project. It zeroes the building product’s full environmental impact, in all modules. It is therefore a different function from the project type “Renovation”, which is set on the project itself and does not affect any individual building product. A user who thinks “this is a renovation project, so I’ll set the renovation flag on everything” thereby zeroes their entire model.
Four ways to make a building product contribute nothing
Section titled “Four ways to make a building product contribute nothing”Demolition, a delayed start beyond the study period, reuse enabled, and service life 0 (in BR23) can all four make a building product contribute nothing to the result, but they do so for entirely different reasons and suit entirely different situations. See Service life 0 and calculation mode for the last of the four.