| A counter, shelf, or shelving for bottles and glasses extending along the wall of a barroom behind the bar.
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| A short piece of gypsum wallboard adhesively laminated behind the joints between each framing member to reinforce the joint.
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| Specially designed clips attached to the back of gypsum board that fit into slots or other formations in the framing to hold the gypsum board in place; often used in demountable partition designs.
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| 1. Rough masonry built behind a facing or between two faces. 2. Filling over the extrados of an arch. 3. Masonry in spaces between structural timbers, sometimes called Nogging. 4. The filling with earth of the excavations after the concrete and masonry work below finish grade is completed.
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| The forming of a bevel or groove on the other side of a partially welded joint to assure complete penetration upon subsequent welding from that side.
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| Mounted tile with perforated paper, fiber mesh, or other suitable bonding material applied to the backs or edges of the tile so that a relatively large portion of the tile area is exposed to the setting bed.
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| In roofing, the nailing of felts under the overlap to prevent slippage of the felts.
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| 1. In plumbing, a higher air pressure at the sewer side of the trap than on the fixture side of the trap; water can, under certain conditions, be forced out of the trap in the wrong direction towards the fixture. 2. In a refrigerating system, the pressure on the low side of the system, also called suction pressure or low-side pressure.
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| A coat of paint applied to the back of woodwork and exterior siding to prevent moisture from entering the wood and causing the grain to swell.
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| Small toothed, joint-cutting saw with a metal back strip to keep the saw rigidly in line.
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| While all carpet seams are located on the back or underside of the carpet, those made when the carpet is turned over or face-down are called back seams, while those made with the carpet face-up are called face seams.
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| The flow of water or other liquids, mixtures, or substances into the distributing pipes of a potable supply of water from any sources other than its intended course, due to a negative pressure in such pipe.
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| A protective panel installed on the wall behind a counter, sink or lavatory.
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| A branch vent installed for the purpose of protecting fixture traps from siphoning; back vents include most of the vents not installed specially to permit circulation between vent stacks and soil or waste stacks.
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| The wall facing an observer who is standing at the entrance to a room, shower, or tub shower.
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| 1. The part or surface behind the front; the rear. 2. See Steel Square. 3. The back surface of gypsum board; the opposite side from the face; usually the side that would be concealed or the side in contact with the framing; also referred to as the Code Side.
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| A simple molding sometimes used around the outer edge of plain rectangular casing as a decorative feature.
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| A vertical structure used as a guard against losing thrown objects, usually specified in the design of athletic playing fields and surfaces.
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| An offsetting charge against a bill, often asserted by an owner against a prime contractor or a by prime contractor against a subcontractor based on supposedly defective construction work.
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| A valve that allows flow of a liquid in only one direction; a backflow preventer; a backcheck valve.
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| See Backing Board.
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| The act or process of placing excavated earth in a trench or back against the foundation of a structure, by a man and a hand shovel.
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| Earth or earthen material used to fill the excavation around a foundation; the act of filling around a foundation.
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| In welding, a short pop of the flame from the torch tip followed by immediate reappearance or complete extinguishment of the flame.
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| Any arrangement of pipe or fixtures which can cause backflow to occur.
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| Backcheck valve; a device which prevents sewage from flowing backward into a buildings plumbing system.
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| The unintentional flow of water into the supply pipes of a plumbing system from a non-supply source; back-siphonage is one type of backflow, generally due to a temporary occurrence of negative pressure (suction) in the pipes.
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| The first cut of a plow from which the slice is laid on undisturbed soil.
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| The sound level present in a room or space at any given time above which speech, music, desired signal, or sound must be raised in order to be heard or made intelligible.
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| A gas-welding technique wherein the flame is directed opposite to the progress of welding.
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