md-19003-en - Flipbook - Side 5


3. LCA: Calculation rules
3.1
Declared Unit
The declaration applies to 1 kg metal ceiling systems
made of steel.
Declared unit
Name
Conversion factor to 1 kg
Declared unit
Grammage
Value
0.146
1
6.83
Unit
kg
kg/m2
3.2
System boundary
The Life Cycle Assessment considers the system
boundaries "cradle to grave" and follows the modular
construction system described by /EN 15804/. The
LCA takes into account the following
modules:












A1: Raw material supply (Production of
precursors, packaging)
A2: Transport of precursors
A3: Manufacturing (Energy usage, utilization
of production residues)
A4: Transport from the gate to the site
A5: Assembly (Installation, recycling of
packaging)
B1: Use
B4: Replacement
B5: Refurbishment
C1: De-construction demolition
C2: Transport to waste-processing facility
C3: Waste processing for reuse, recovery
and/or recycling
D: Potential for reuse, recovery and/or
recycling as net flows and benefit
3.3
Estimates and assumptions
Specific data regarding the production process was
provided by the members of TAIM e.V.. Missing data
was supplemented by estimates based on comparable
substitutes or data used from the secondary literature
and the database /GaBi 8:2018/. Missing data set were
modeled by the auditor. The thermal utilization of the
packaging in the assembly stage was modeled with an
R1 factor of the waste incineration plant (MVA) with R1
value > 0.6.
3.4
Cut-off criteria
All relevant data, i.e. all applied materials according to
the recipe and the energy used originate from the
production data acquisition and have been considered
within the inventory analysis. For the
considered in- and outputs, the actual transport
distances were used. Material- and energyflows with a
proportion of less than 1 % were collected. Waste of
upstream products, which accumulate in small
quantities (
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