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Keystone:
A wedge-shaped or trapezoidal structural piece that forms the center unit at the top of a masonry arch.
Kick Plate:
A metal strip placed at the lower edge of a door to protect the finish.
Kite Winder:
A triangular or kite-shaped step in a circular stairway that occurs where the direction of the stairway changes.
Knee Brace:
A diagonal member (usually at a 45 degree angle) that is attached from a piling to a main structural beam or girder and serves to stiffen the foundation.
Knee Wall:
A wall that acts as a brace by supporting roof rafters at an intermediate position along their length.
Knob and Tube Wiring:
Old electrical wiring on ceramic knobs and tubes secured to structural members of a property.
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