Search Results for L labeled door A door that carries a certified fire rating issued by Underwritersí Laboratories, Inc. labeled frame A doorframe that conforms to standards and tests required by Underwritersí Laboratories, Inc. and has received its label of certification. labeled window A fire-resistant window that conforms to the testing standards of Underwritersí Laboratories, Inc. and bears a label designating its fire rating. labor and material payment bond (payment bond) A bond procured by a contractor from a surety as a guarantee to the owner that the labor and materials applied to the project will be paid for by the contractor. ladder core A hollow structure of wood or insulation board used as the core of interior doors and built with strips running vertically or horizontally through the core area. lag bolt (coach screw, lag screw) A threaded screw or bolt with a square head. laitance In concrete, a weak, crumbly, and dusty surface layer caused by excessive water that has bled to the surface and subsequently weakened it. lally column A trade name for a pipe column from 3" to 6" in diameter, sometimes filled with concrete. LAM Laminated laminated beam (laminated-veneer lumber) A straight or arched beam formed by built-up layers of wood. The method of lamination may be gluing under pressure, mechanical nailing or bolting, or a combination. laminated wood (laminated veneer lumber) Any of several products formed by built-up layers (plies) of wood. Thin wood veneers may be laminated to a wood subsurface, several plies may be laminated together to form plywood, or thicker pieces may be used to form structural members such as beams or arches. land tile Clay tile laid with open joints and usually surrounded by porous materials. lapping The overlapping of reinforcing bars or welded wire fabric for continuity of stress in the reinforcing when a load is applied. latent defect A defect in materials or equipment that would not be revealed under reasonably careful observation. A patent defect, on the other hand is one which may be discovered by reasonable observation. lateral buckling The failure of any structural column, wall, or beam which has undergone excessive side-to-side (lateral) deflection, movement, or twist. lateral support Any bracing, temporary or permanent, that provides greater support in resisting side-to-side (lateral) forces and deflections. Floor and roof members typically provide lateral support for walls, columns, and beams. lath Strips of wood or metal used as a base for plaster. lavatory A basin, with running water and drainage facilities, used for washing the face and hands. lay-in Describes tile or panels that are installed into metal channels in suspended ceiling systems. leader In a hot-air heating system, a duct that conveys hot air to an outlet. ledge A molding that projects from the exterior wall of a building. ledger A horizontal framework member that carries joists and is supported by upright posts or by hangers. ledger strip On a beam that carries joists flush with its upper edge, the strip of wood attached along the bottom edge of the beam that serves to seat the joists and to support them. let-in brace A diagonal brace inserted or let in to a stud. level A term used to describe any horizontal surface that has all points at the same elevation and thus does not tilt or slope. leveling plate A bearing plate set to an elevation used for setting structural steel. lf Linear foot life cycle A term often used to describe the period of time that a building can be expected to actively and adequately serve its intended function. lift slab A method of concrete construction in which floor and roof slabs are cast at ground level and hoisted into position by jacking. Also, a slab that is a component of such construction. light A pane of glass. lighting panel An electric panel housing fuses and circuit breakers, that serve to protect the branch circuits of lighting fixtures. lightweight block A cement masonry unit manufactured using lightweight aggregate and often used to reduce the weight of partitions. lightweight concrete Concrete of substantially lower unit weight than that made using gravel or crushed stone aggregate. limit control A safety device for a variety of mechanical systems that detects unsafe conditions, sounds an alarm, and shuts off the system. linoleum An inexpensive form of resilient floor covering that is manufactured of ground cork and oxidized linseed oil. Linoleum is applied to a coarse fabric backing and possesses a low resistance to staining, dents, and abrasion. lintel A horizontal supporting member installed above an opening such as a window or a door that serves to carry the weight of the wall above it. lintel block (U-block) A special U-shaped concrete block used with other blocks to form a continuous-bond beam or lintel. Reinforcing steel is placed in the void followed by mortar or grout. litigation The process by which parties submit their disputes to the jurisdiction and procedures of federal or state courts for resolution. LL Live load load (1) The force, or combination of forces, that act upon a structural system or individual member. (2) The electrical power delivered to any device or piece of electrical equipment. load factor In structural design, the factor applied to the working load to determine the designís ultimate load. loading dock seal A flexible pad installed around the door of a loading dock to form a tight seal between the receiving doors and the opening of a truck that is backed into the dock. loading platform (loading dock) A platform adjoining the shipping and receiving door of a building, usually built to the same height as the floor of the trucks or railway cars on which shipments are delivered to and from the dock. lock seam (lock joint) In sheet metal roofing, a joint or seam formed by bending the two adjoining edges over in the form of hooks, which are interlocked. The hooks are then pressed down tightly to form a seam. lockset A complete system including all the mechanical parts and accessories of a lock, such as knobs, reinforcing plates and protective escutcheons. long span steel joist A structural framing joist that provides large open areas within a building. It is usually a very deep beam due to the nature of the building system. lookout A short wooden brace or block that supports an overhanging portion of a roof. loop vent In plumbing, a venting configuration for multiple fixtures, as in a public restroom. loose lintel A lintel that is placed across a wall opening during construction to support the weight of the wall above, but which is not attached to another structural member. louver A framed opening in a wall, fitted with fixed or movable slanted slats. Though commonly used in doors and windows, louvers are especially useful in ventilating systems at air intake and exhaust locations. Lucite The trade name for a strong, clear plastic material manufactured in sheets and other forms. lug Any of several types of projections on a piece of material or equipment. Such projections are used during handling and installation. lumen A unit of luminous flux that defines the quantity of light. lute A straight-edged scraper used to level wet concrete. Search Again