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Term Definition
Joint, Butt. see Butt Joint  
Joint, Contraction. see Contraction Joint.  
Joint, Control. see Control Joint.  
Joint, Expansion. see Expansion Joint.  
Joint. 1. The location where two or more members are to be joined. 2. The point of connection between structural members. 3. The seam produced by the placement of two pieces of gypsum board together but not necessarily in the same plane. 4. The junction of two pieces, as of wood or veneer. 5. The location at which two pieces of pipe or a pipe and a fitting are connected together.  
Jointer. 1. A metal hand tool used to cut a joint partly through fresh concrete. 2. In masonry, a tool used by bricklayers to form the various types of mortar joints between the courses of masonry, as the V, the concave, and weather joints. 3. An electrically powered machine for making joints.  
Jointing, A. see Joining.  
Jointing. 1. Smoothing and straightening the edge of a wood board. 2. Jointing is done automatically by a jointer. 2. Grinding or filing the teeth or knives of power tools to the correct height; circular saws are jointed so that there are no high or low teeth; knives of planers and jointers are jointed so that each knife makes the same depth of cut as all others. 3. The act of facing the mortar joints.  
Joist Anchor. A metal rod incorporated into a masonry wall that extends out to be fastened to a joist or rafter.  
Joist Bridging. 1. The bracing of joists by the fixing of lateral members between them. 2. Pieces fitted in pairs from the bottom of one floor joist to the top of adjacent joists, and crossed to distribute the floor load. 3. Wood pieces of width equal to the joists and fitted neatly between them. 3. Diagonal or longitudinal members used to keep horizontal members properly spaced, in lateral position, vertically plumb, and to distribute load.  
Joist Girder. A light steel truss used to support open-web steel joists.  
Joist Hanger. A metal stirrup that supports the ends of joists so that they are flush with the girder.  
Joist Painting. The act or process of applying paint to seal, protect, or add color to a joist, usually refers to metal joists.  
Joist, Metal. see Metal Joist  
Joist, Sister. see Sister Joist.  
Joist, Wood. see Wood Joist.  
Joist. A, usually horizontal, structural member used as a floor, ceiling or roof framing member.  
Joule. In the international system of units, the amount of energy needed to raise the temperature of 1 kilogram of water 1 degree Celsius.  
Joule-Thomson Effect. The change in the temperature of a gas on its expansion through a porous plug from a higher pressure to a lower pressure.  
Journal, Crankshaft. Part of shaft which contacts the bearing on the large end of the piston rod.  
Journal. 1. A record of current transactions. 2. A log. 3. The part of a rotating shaft, axle, roll, or spindle that turns in a bearing.  
Journeyman. 1. A fully trained and qualified person in a craft or trade such as a carpenter, plumber, or electrician. 2. A plasterer or lather who through training and experience has become thoroughly skilled in his trade; distinguished from an apprentice or a laborer. 3. A painter who has had at least three years experience and schooling as an apprentice.  
Judgment. A final decision of a court.  
Jumbo Brick. A brick that is larger than standard size and measures 8"x4"x4".  
Jumpover. In piping, a double offset used to return the pipe to its original line; also called a Return Off-Set.  
Junction Box. A metal or hard plastic electrical rough-in box, usually square or octagonal, housing only wire or cable connections.  
Jute Padding. A padding made of a durable yarn that comes from plant fiber used as an underlayment for carpet.  
Jute. strong, durable yarn spun from fibers of the jute plant, native to India and Far East, used in the backings of many carpets.  
Juxtaposition of Colors. Placing colors side-by-side, or close together; complementary colors such as blue and orange in juxtaposition accentuate each other.  
Juxtaposition. The placing of things side by side.  

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