Editing Jettying (section)

===Horizontal elements===
[[File:Dragon-encorbellement-Prieuré de Saint-Arnoult-21-09-2007.jpg|thumb|Jetties in French are called ''encorbellements'' and may be decoratively carved; Prieuré de Saint-Arnoult, France]]
The horizontal elements of jetties are:
* the jetty breastsummer (or bressummer), the sill on which the projecting wall above rests; the bressummer stretches across the whole width of the jetty wall
*the dragon-beam which runs diagonally from one corner to another, and supports the corner posts above and is supported in turn by the corner posts below
*the jetty beams or joists which conform to the greater dimensions of the floor above but rest at right angles on the jetty-plates that conform to the shorter dimensions of the floor below. The jetty beams are morticed at 45° into the sides of the dragon beams. They are the main constituents of the cantilever system and they determine how far the jetty projects
*the jetty-plates, designed to carry the jetty-beams or joints. The jetty-plate itself is supported by the corner posts of the recessed floor below.