Rawmaterial acquisition: This includes the materials used to produce the 5-PC-ME doors such as LSL, particleboard and HDF and veneer sheets, that are purchased by Lambton doors in customized sizes made specifically for their door product. This step also includes the production of PVAc glues and UV finishing. Product manufacturing: The only parts that require on-site transformation are hardwood edges made from sawn hardwood. The basic steps of door manufacturing are the assembly of door components, surface finishing and machining. The inputs and outputs of a door assembly are respectively electricity for the machinery (glue applicators, presses, trimming, sanding), dust and VOCs emission from glues. Packaging: The door undergoes two types of packaging before being shipped. The first is to protect the door with an plastic film. The second is to prepare pallets for shipping, where 20 doors are gathered and wrapped with stretch films. Transportation of packaging materials to the manufacturing plant, namely polyethylene films, stretch-films and pallet was considered.
Construction: This stage includes the delivery of the product to a building site, installation, as well as transport and disposal of plastic film and pallet in a landfill.
Use: Use of interior doors, in general, does not require energy or cleaning products such as detergents. No maintenance is required. This life cycle stage is empty.
End of life: At the end of their lives, most wood products are disposed into landfills in Canada (Statistics Canada, 2012). Therefore, a landfill of 100% has been considered in this study. The transportation from the building site to the landfill is considered in this stage. Functional unit The closure and separation of two rooms with a communicating surface to be filled of 2.13 m (7 ft) high by 0.91 m (3 ft) wide using a standard interior wooden door with a thickness of 44.5 mm (1,75 in), during the lifetime of the building. The functional unit does not include the possibility to open this volume and using it for passing through the wall. Reference flows Product service life of the door is 40 years. The building is 60 years. Then, the current door will be replaced once during the whole building life to fulfill the functional unit. Reference flows of all life cycle stages have been multiplied by 2.
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