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Term Definition
Flaked. Irregularities left on the edge of the tile mainly due to the use of machine cutting tools.  
Flaking. Detachment of small pieces of paint film.  
Flame Spread Classification. A standard measurement of the relative surface burning characteristics of a building material when tested.  
Flame Spread Rating. A measure of the rapidity with which fire will spread across the surface of a material.  
Flame Spread. The propagation of a flame away from the source of ignition across the surface of a liquid or a solid, or throughout the volume of a gaseous mixture.  
Flame Test for Leaks. Tool which is principally a torch; when a halogen mixture is fed to the flame, this flame will change color in the presence of heated copper.  
Flameproof Tile. Tile that has been made resistant to flame.  
Flameproofing. An act or process of making an object resistant to the action of flame.  
Flammable Liquids. Liquids having a flash point below 140° F. (60° C.) and a vapor pressure not exceeding 40 psia (2.81 kg/cm2) at 100° F. (38° C.).  
Flammable. Capable of being easily ignited; same as inflammable; the opposite is nonflammable.  
Flange. A rib or rim on an object for strength, for guiding, or for attachment to another object.  
Flanged Pipe. A pipe that has been fitted with a projecting ring, ridge or collar, to strengthen, prevent sliding, or accommodate attachments.  
Flanking Paths. Paths by which sound travels around an element that is intended to impede it.  
Flapper Valves. Thin metal valve used in refrigeration compressors which allows gaseous refrigerants to flow in only one direction.  
Flare Header. 1. A brick burned on one end to a darker color than the face. 2. A header of darker color than the field of the wall  
Flare Nut. Fitting used to clamp tubing flare against another fitting.  
Flare. An enlargement at the end of a piece of flexible tubing by which the tubing is connected to a fitting or another piece of tubing; this enlargement is made at about a 45 degree angle; fittings grip it firmly to make the joint leakproof and strong.  
Flash Cove. A detail in which a sheet of resilient flooring is turned up at the edge and finished against the wall to create an integral baseboard.  
Flash Gas. Instantaneous evaporation of some liquid refrigerant in evaporator which cools remaining liquid refrigerant to desired evaporation temperature.  
Flash Point. The temperature at which the material gives off flammable vapor in sufficient quantity to ignite momentarily on the application of a flame under specified conditions.  
Flash Set. The rapid development of rigidity in a mixed portland cement paste, mortar, or concrete usually with the evolution of considerable heat, which rigidity cannot be dispelled nor can the plasticity be regained by further mixing without addition of water; also referred to as Quick Set or Grab Set.  
Flash Weld. Resistance type weld in which mating parts are brought together under considerable pressure while a heavy electrical current is passed through the joint to be welded.  
Flashback. In welding. a recession of the flame into or back of the mixing chamber of the torch.  
Flashing Block. In masonry, metal flashing used to block a parapet wall and prevent roof leaks around such a wall.  
Flashing Cement. A plastic mixture of cutback bitumen and mineral stabilizers, asbestos fibers or other inorganic fibers, used for reinforcing, mixed with a solvent and used as an adhesive.  
Flashing, Roof. see Roof Flashing.  
Flashing, Step. see Step Flashing.  
Flashing, Through-Wall. see Through-Wall Flashing.  
Flashing. 1. A thin, continuous sheet of impervious material such as metal, plastic, rubber, or waterproof paper used to prevent the passage of water through a joint in a wall, roof, or at a chimney; the material used and the process of making watertight the roof intersections and other exposed places on the outside of a structure. 2. Nonuniform appearance on surfaces in which coating dries with spotty differences of color or gloss.  
Flat Arch. An arch or span constructed with a flat top and bottom; steel angle iron is usually used to help support this arch.  

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