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In architecture a jack rafter is one of the shorter rafters used in constructing a hip or valley roof; in the United States, the term applies to any secondary roof timber, like the common rafters resting on purlins in a trussed roof; and also, one of the pieces simulating extended rafters, used under the eaves in some styles of building.
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In architecture the term jack timber is applied to any timber, such as a rafter, rib, or studding, which, being intercepted, is shorter than the others.
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In architecture a jack truss is a minor truss used in a hip roof, where the roof does not have its full section.
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In architecture, Jacobean refers to a style of architecture popular during the reign of James I which was characterised by the grafting of Classical details onto mediaeval-style buildings.
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In architecture a jamb is the vertical side of any opening, such as a door or fireplace; hence, less properly, the term applies to any narrow vertical surface of a wall, such as the wall of a chimney- breast or of a pier, as distinguished from its face.
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The Jamieson Pot is an ornamental clay chimney pot usually 60 or 75 cm tall, with a distinctive two part body.
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Jaspe papers are wallpapers with a soft, irregular pattern giving the appearance of the surface having been combed or brushed.
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A jedding axe is a stone mason's tool, having a flat face and a pointed part.
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In architecture a jerkinhead is the hipped part of a roof which is hipped only for a part of its height, leaving a truncated gable.
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In architecture a jesse window is a window of which the glazing and tracery represent the tree of Jesse.
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In architecture a jetty is a part of a building that jets or projects beyond the rest, and overhangs the wall below.
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In architecture a jib door is a door made flush with the wall, without dressings or mouldings, often as a disguised or concealed door.
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In architecture a joggle is a notch or tooth in the joining surface of any piece of building material to prevent slipping; sometimes, but incorrectly, applied to a separate piece fitted into two adjacent stones, or the like.
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In architecture a joggle joint is a joint in any kind of building material, where the joining surfaces are made with joggles.
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In scaffolding, a joint pin or spigot, is an internal connection used for joining two metal tubes together, end to end. Joint pins are fitted with a screw by which the device can be expanded to grip the inside of the tubes firmly.
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A jointer is a bent piece of iron inserted to strengthen the joints of a wall.
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A jointing rule is a long straight rule, used by bricklayers for securing straight joints and faces.
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In architecture a joist is a piece of timber laid horizontally, or nearly so, to which the planks of the floor, or the laths or furring strips of a ceiling, are nailed. The joints are called varying names according to their position or use, a binding joist, bridging joist, ceiling joist, trimming
joist, etc.
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In architecture a jube is a chancel screen or rood screen. The term is also applied to the gallery above such a screen, from which certain parts of the service were formerly read.
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A Judas slit, or Judas hole, is a peep-hole in a prison cell door through which a prison guard can look into the cell.
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In architecture a jump is an abrupt interruption of the level in a piece of brickwork or masonry.
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A jumper is a long drilling tool used by masons and quarrymen.
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Abbreviations
Architecture
