Jettying (jetty, jutty, from Old Frenchgetee, jette)[1] is a building technique used in medievaltimber-frame buildings in which an upper floor projects beyond the dimensions of the floor below. This has the advantage of increasing the available space in the building without obstructing the street. Jettied floors are also termed jetties.[2][3] In the U.S., the most common surviving colonial version of this is the garrison house.[4] Most jetties are external, but some early medieval houses were built with internal jetties.[5]
^Noble, Allen George, and M. Margaret Geib. Wood, brick, and stone: the North American settlement landscape. Amherst: University of Massachusetts Press, 1984. 22.