WALLPLATE
Wall plate
A plate or wall plate is a horizontal, structural member in wooden building framing. A plate in timber framing is "A piece of Timber upon which some considerable weight is framed...Hence Ground-Plate...Window-plate 1..." etc. Also called a wall plate, raising plate, or top plate, The terms sole plate or sill plate are used for the members at the bottom of a wall at the foundation but are most often just called a sole or sill without the word plate.The above text is a snippet from Wikipedia: Wall plate
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