Data sources The LCA study collected primary data from Lambton doors manufacturing operations in 2012 continuously until 2014. When primary data were not available, the unit processes were selected from the ecoinvent v2.2 database. In unit processes, electricity grid mixes and transportation have been adapted to the specific context (Quebec, Canada, US or North-America). Besides all background unit processes from ecoinvent have been adapted to a North-American background grid mix. A report from the Consortium for Research on Renewable Industrial Materials (CORRIM) on prefinished engineered wood flooring manufacture has been used for the modeling of hardwood veneer production (Bergman and Bowe, 2011). The ecoinvent report on LCI of chemicals has also served as a reference for created chemical processes for coating (Althaus et al., 2007). The lifetime of the building was set as 60 years, in compliance with FPInnovations PCR. Cut-off rules According to the PCR, mass and energy flow contributing to less than 1% of the total mass or energy flow can be excluded, provided its environmental contribution is minor (<2%). However, no cut-offs have been applied in the calculations. Allocation For the door production, it has been possible to break down the majority of production processes to avoid allocation. Hardwood edges production is a multi-output process and mass allocation factors of 71% and 29% have been applied respectively to “hardwood edges” and co-product “wood residue”. Production of wood dust has been considered as a co-product of door production and economic allocation has been applied since wood dust is sold to another company. However, compared to doors prices, wood dust price is very negligible (factor 10-4) and allocation factors have been set to 100% and 0% for doors and dust respectively. Exclusions This LCA does not include hardware environmental impacts (production, transportation, nor installation). Geographical coverage This study is conducted in a Quebec context, as Lambton Doors is based in Quebec. Some background processes are representative of a North American context.
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