Step-by-Step
vyzn spreads each component's environmental impact over its service life: a metric "per m² per year" equals total impact of the component ÷ amortization period ÷ EBF.
The amortization periods are defined by SIA 2032 (Appendix C) per eBKP-H element group, staggered at 60/40/30/20 years (e.g., load-bearing construction 60, building services 20).
As a result, short-lived components like building services weigh more per year than long-lived construction with the same total impact.