Wall

Walls and roofs are most important for heat gain into site office because the office only has two stories and the window areas are relatively less in site office. The material of the exterior walls are the combination of an aluminum sheet, 90mm plastic foam sheet and 12mm-plywood sheet while for the partitions, they are the combination of a skeleton of wood timber and 12mm-plywood sheet on the sides. From a previous study, it has been found that when using polystyrene expanded or polyurethane expanded insulation, the building will have a relative low U-value and load component.

Base cases: walls with aluminum and steel siding sheet + air layer + plywood

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