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General comment The data selected for LCA analysis originates from ITB-LCI questionnaires completed by HSHansen a/s using the inventory data, ITB and Ecoinvent database v. 3.9. No specific data collected is older than five years and no generic datasets used are older than ten years. The representativeness, completeness, reliability, and consistency are judged as good. Data for Polish electricity was supported by Ecoinvent database v. 3.9 and KOBiZE. KOBiZE data is supplemented with Ecoinvent v. 3.9 data on the national electricity mix impact where no specific indicator data is provided. Specific EPDs were used for hydro aluminium extrusion ingot inputs. Environmental characteristics that were not included in these EPDs were taken from the Ecoinvent.
The allocation rules used for this EPD are based on EN 15804 + A2 and ITB-PCR A v 1.6. Production of the curtain wall is a line process conducted in the manufacturing plan located in Glogów Malopolski (Poland). All impacts from raw materials extraction and processing are allocated in A1 module of EPD. Input and output data from the production is inventoried and allocated to the production on the mass basis. Water and energy consumption, associated emissions and generated wastes are allocated to module A3. Energy supply was inventoried for whole production process. Packaging materials were taken into consideration.
Minimum 99.0% input materials and 99.9% energy consumption (electricity, gas, LPG, other) were inventoried in a processing plant and were included in the calculation. In the assessment, all significant parameters from gathered production data are considered, i.e. all material used per formulation, utilized thermal energy, and electric power consumption, direct production waste and available emission measurements. Tires consumption for transport was not considered. Substances with a percentage share of less than 0.1% of total mass were excluded from the calculations. The packaging products (wooden pallets) are included.
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