Key stone - It is the highest central wedge shaped block of an arch.

King closer - It is a brick which is cut in such a way that the width of one of its end is half that of a full brick. It is formed by cutting off the triangular piece , between the centre of one end and the centre of one side.

King post roof truss - It is a form of roof truss which is commonly used for spans varying from 5m to 9m.

Knotting - Knots exude resin. Knotting is the process of sealing the knots by suitable means so that the resin from the knots may not destroy the paint film by way of cracking , peeling or brown discoloration.