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Term Definition
Bulk. 1. Size; magnitude; large mass or quantity. 2. Large quantities as in bulk cement. 3. To cause to swell or bulge. 4. A small structure projecting from a building, as a booth or stall.  
Bulked Continuous Filament (BCF). Continuous strands of synthetic fiber made into yarn without spinning; often extruded in modified cross section such as multi-lobal, mushroom or bean shape and/or texturized to increase bulk and covering power.  
Bulkhead Formwork. The temporary formwork that blocks fresh concrete from a section of forms or closes the end of a form at a construction joint.  
Bulkhead. 1.A vertical partition separating compartments, as on a ship or aircraft. 2. A structure or partition to resist pressure or shut off water, fire, or gas. 3. A retaining wall along a waterfront. 4. A projecting structure with a sloping door giving access to a cellar stairway or shaft.  
Bulking Curve. Graph of change in volume of a quantity of sand due to change in moisture content.  
Bulking Factor. Ratio of the volume of moist sand to the volume of the sand when dry.  
Bulking Value. Of a pigment, its ability to add volume to a paint.  
Bulking. Increase in the bulk volume of a quantity of sand in a moist condition over the volume of the same quantity dry.  
Bull Float. A tool comprising a large, flat, rectangular piece of wood, aluminum, or magnesium usually 8 in. (20 cm) wide and 42 to 60 in. (100 to 150 cm) long, and a handle 4 to 16 ft. (1 to 5 m) in length used to smooth unformed surfaces of freshly placed concrete.  
Bull Nose Brick. 1. A brick having one rounded corner. 2. Bricks that have their ends or corners rounded off.  
Bull Nose. 1. In plastering, an external angle that is rounded in order to eliminate a sharp corner; can be made by running with plaster or using a bull nose corner bead with the proper radius. 2. Any material with a rounded edge such as a concrete block, ceramic tile, or brick. 3. See Step Return.  
Bulldozer. A tractor driven machine with a horizontal blade for clearing land, road building, or similar work.  
Bulletin Board. A wall hanging unit upon which information or messages are attached; a thin board, often of cork, hung on a wall for the attachment of public announcements.  
Bulletproof Glass. A protective laminated glass sheet, heat and pressure-bonded with resin sheets to resist the passage of bullets.  
Bulletproof Partition. A dividing wall which has been rendered bulletproof by using specific materials in its construction.  
Bulletproof. Manufactured to prevent breakage or penetration from a strong external force.  
Bullnose Block. A concrete masonry unit which has one or more rounded external corners.  
Bullnose, Corner. A type of ceramic tile bullnose trim with a convex radius on two adjacent edges.  
Bullnose, Glazed. A ceramic trim tile with a convex radius on one edge that has been given a glassy or glossy surface.  
Bulls Eye. 1. A small circular window or opening; a bulls eye window. 2. A small thick disc of glass inserted, as in a deck, to let in light.  
Bumper, Dock. Thick rubber units placed under loading dock openings to absorb the shock and prevent damage when trucks back in for loading or unloading.  
Bumper, Door. Rubber tip devices mounted on walls or baseboards that prevent door knobs from marring walls.  
Bund Wall. A wall built around a tank to contain its contents should the tank or its piping spring a leak.  
Bundle. Two pieces of gypsumboard packaged face to face.  
Bundled Bars. A group of not more than four parallel steel reinforcing bars in contact with each other, usually tied together.  
Bundling Tape. End tape to secure two pieces of gypsum board into a bundle.  
Bunker. Space where ice or cooling element is placed in commercial installations.  
Buoyant Uplift. The force of water or liquefied soil that tends to raise a building foundation out of the ground.  
BUR. Built-Up Roofing.  
Burden. The amount of money that has to be added to cover overhead.  

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