| A | B | C | D | E | F | 
| G | H | I | J | K | L | 
| M | N | O | P | Q | R | 
| S | T | U | V | W | X | 
| Y | Z | 
| K Back to top  | 
| key A groove in the top of a footing.  | 
| keys Little fingers of plaster that squeeze through lath.When they harden, these hold the plaster in place.  | 
| keystone An angular block centered over a door or window in a header or mantle.  | 
| kick-out clause A clause in a sales contract that allows a seller to accept one buyer’s contingent offer, then back out without penalty if a second buyer makes a better offer.  | 
| kit home A structure that contains prefabricated components and is put together by a contractor.  | 
| K Back to top  | 
| knee wall A wall-like structure that supports roof rafters.  | 
| knob-and-tube wiring An old-fashioned wiring system that has been replaced by fuses and circuit breakers.  |