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.Horizontal elements Jetties in French are called an encorbellement and may be decoratively carved. the less substantial studs of the close studding along the walls above and below the jetty.the more massive corner posts of the timber frame that support the dragon beam from the floor below and are supported in their turn by the dragon beam for the extended floor above.The vertical elements of jetties can be summarized as: An example of a hewn jetty in Glattfelden, Switzerland This is framed on a few cantilevered beams.

Vertical elements Paul Revere House Boston, MA built 1680. hewn jetty also called a false jetty: Framed on projections of the posts rather than on cantilevered beams (or brackets).Structurally, jetties are of several types: Jetties were popular in the 16th century but banned in Rouen in 1520 relating to air circulation and the plague, and London in 1667 relating to the great fire. as a status symbol or '.symbol of wealth and status.'.uses shorter timbers, a benefit due to timber shortages and difficult handling of long timbers especially in city streets.to shelter the lower walls of the house from the weather.the structural advantage of the jettied wall counteracting forces in the joists or tying a stone wall together.The origins of jettying are unclear but some reasons put forward for their purpose are: The overhanging corner posts are often reinforced by curved jetty brackets. Jetty joists in their turn were slotted sideways into the diagonal dragon beams at angle of 45° by means of mortise and tenon joints. The bressummer (or breastsummer) itself rests on the ends of a row of jetty beams or joists which are supported by jetty plates. This is an example of a jetty supported on brackets.Ī jetty is an upper floor that depends on a cantilever system in which a horizontal beam, the jetty bressummer, supports the wall above and projects forward beyond the floor below (a technique also called oversailing). Structure The under-side of jetties in Germany are sometimes decorated and called a windbrett (wind board). Most jetties are external, but some early medieval houses were built with internal jetties. In the U.S., the most common surviving colonial version of this is the garrison house.

This has the advantage of increasing the available space in the building without obstructing the street. Jettying (jetty, jutty, from Old French getee, jette) is a building technique used in medieval timber-frame buildings in which an upper floor projects beyond the dimensions of the floor below. The ends of the multiple cantilevered joists supporting the upper floors can easily be seen.

This article is about the building technique.

Medieval wooden house