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Conversely, a window sill may only extend from the internal wall structure to the outside and not be visible from the building's interior. In that case, the window likely has a shelf-like piece of interior trim work—often made of wood, tile, or stone—which is distinct from the exterior window sill.
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The exterior portion of a window sill provides a mechanism for shedding rainwater away from the wall at the window opening. Therefore, window sills are usually inclined slightly downward away from the window and wall, and often extend past the exterior face of the wall, so the water will drip off
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A window sill may span the entire width of a wall from inside to outside, as is often the case in basic masonry construction, making it visible on both the interior and exterior of the building. In such a case, the exterior window sill and interior window sill would be two sides of the same
159:, but it is also referred to as a window sill. In residential buildings, some people use this latter kind of interior window sill or stool to store houseplants, books, or other small personal items.
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Windows may not have a structural sill or the sill may not be sufficiently weather resistant. In these cases, a strip of waterproof and weather resistant material (
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may be used to protect the wall and shed the water. Like the sill, a sill pan will usually be inclined and protrude from the wall.
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and is regarded as part of the window frame. The bottom of a window frame sits on top of the window sill of the wall opening.
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A window sill in the most general sense is a horizontal structural element below a window opening or window unit in
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A Dictionary of
Architecture and Building: Biographical, Historical, and Descriptive
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81:. Window sills serve to structurally support and hold the window in place.
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materials to further increase their water resistance.
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53:Books placed on an interior window sill or stool
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88:Some windowsills are made of
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151:The technical term used by
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193:Sturgis, Russell (1901).
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220:Architectural elements
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147:structural element.
131:Types of window sill
141:framed construction
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59:windowsill
163:See also
125:sill pan
98:concrete
215:Windows
137:masonry
79:window
41:lintel
117:vinyl
113:steel
102:tile
75:cill
37:sill
121:PVC
65:or
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