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In architecture, a jamb (), is the side-post or lining of a or other aperture. The jambs of a window outside the frame are called . Small shafts to doors and windows with caps and bases are called ; when in the inside arris of the jamb of a window, they are sometimes called .
A doorjamb, door jamb, or sometimes doorpost is the vertical portion of the door frame onto which a door is secured. The jamb bears the weight of the door through its , and most types of door latches and extend into a recess in the doorjamb when engaged, making the accuracy of the plumb (i.e. true vertical) and strength of the doorjambs vitally important to the overall operational durability and security of the door.
The word jamb is also used to describe a wing of a building, perhaps just in Scottish architecture. John Adam added a 'jamb' to the old Leith Customs house in the Citadel of Leith in 1754–1755.Edinburgh City Archives. Dean of Guild Court papers, warrant granted to John Adam on 27 June 1764 when he presented a full set of building accounts.
In and vaults, the soffit is the curved inner surface of the arch or vault located above the impost, as opposed to the outer surface called the arch or vault crest.Wilfried Koch (2012). 9783653017625, Peter Lang GmbH, Internationaler Verlag der Wissenschaften. . ISBN 9783653017625
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