K

Keystone

The piece, usually wedge shaped, at the top of an arch.

Kick Plate

A metal, wood or plastic strip, placed at the lower edge of a door or on a riser of a step to protect it from damage by accidental kicking.

Kiln-Dried-Lumber

Lumber that has been kiln-dried, generally to a moisture content of 6 to 12 percent.

King Post

The central upright piece in a roof truss.

Knee Wall

A low wall resulting from one-and-one-half-story construction.