In United States buildings market, sash windows are the widespread adoption mainstream of window type.
American sash windows have two types as single and double hung windows. Single one is fixed glass panes directly on the frame, only make the bottom frame lift. This kind of windows has lower material cost, and can get better tightness and water tightness ability. Single sash windows just need a set of hardware and are more affordable. Sash windows, as double hung windows double, hung windows have two lifted glass frames. The selection of their ventilation parts more flexible. It is convenient to clean glass indoors, and easy to disassembled and maintained.
Sash windows, as vertical lifting window, make the stress concentration on the window but not wall body and window frame. So, the load of sash windows is far less than casement ones. So it is reasonable to narrow profile cross-section and visible surface, then relatively save building materials and project cost. materials, reduce cost, at the same time, it also increased rate of perspective.
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