Term Definition
Lap 1 like
Cover the surface of a shingle or roll with another
Lap Joint 3 likes
A joint made by placing one structure partially over another and bonding the overlapped parts.
Lap Siding 3 likes
See Bevel Siding
Lapping 0 likes
Smoothing a metal surface to high level of accuracy with a fine abrasive
Laser2 likes
A machine that produces an intense beam of monochromatic infrared, visible or ultraviolet radiation employed in industry and medicine; used in construction to create accurate sightings, and plumb and level vertical and horizontal alignments
Acronym for Light Amplification by Stimulated Emission of Radiation
Latch3 likes
A beveled metal tongue controlled by a spring-loaded knob or lever that enables door closure by engaging the locking mechanism without a key. Contrasts with dead bolt
Latent Ambiguity 1 like
A term of a contract that appears clear but becomes ambiguous due to external circumstances
Latent Defect 3 likes
Construction defect that is not distinguishable with normal observation
Latent Heat 2 likes
Heat that changes the state of a substance from a solid to a liquid, or a liquid to a gas
Latent Heat Gain 4 likes
Adding heat to an enclosure by increasing the moisture content
Latent Heat of Condensation 1 like
Quantity of heat lost by a pound of a material when it changes from a gas to a liquid
Latent Heat of Vaporization 0 likes
Quantity of heat needed per pound of a substance to change its state from a liquid to a gas
Lateral (Electric, Gas, Sewer, Telephone, and Water) 2 likes
Underground trench and related services (electric, gas, telephone, sewer and water lines) that will be submerged within the trench
Lateral Brace 4 likes
A structural brace that resists lateral motion of a truss or beam
Lateral Branch 0 likes
See Horizontal Branch
Lateral Force 2 likes
A force usually horizontal, such as wind, earthquake, or soil pressure against a foundation wall
Lateral Force Coefficients 2 likes
Factors applied to a structure’s weight to define lateral force for seismic design
Lateral Load 1 like
The horizontal part of the load created by an arch, vault, dome, or frame
A horizontal load placed on a structure such as wind or earthquake
Lateral Pressure 1 like
Horizontal pressure against the side of a high foundation wall such as the force of soil or wind
Lateral Slip Fault 2 likes
A fault whose relative displacement is only horizontal
Lath 1 like
Slender wood, gypsum, metal, or insulating board that is secured to a building frame performing as a base for plaster, tiles, or shingles
Lattice5 likes
Open crisscrossed wood framework or metal strips that have regular, patterned spaces
Leasehold Improvements 1 like
A term used to describe tenant improvements for construction in retail stores and office buildings
Ledger for a Structural Floor 1 like
Wood frame lumber perimeter part; ledger for a structural floor is the part that bolts onto the face of a foundation wall and supports the wood structural floor
Ledger Strip 4 likes
Lumber strip nailed along the bottom of a girder side on which supporting beams or joists rest
Leech Field 0 likes
Process of treating and disposing of sewage in rural areas that do not have access to a municipal sewer system; sewage is filtered and ultimately dispersed into an area of the lot known as a leech field
Let-in Brace 1 like
One inch thick boards inserted diagonally into notched studs; additionally an L-shaped, 10 foot metal strap installed early by the framer to support an exterior wall or wall corner
Level3 likes
Horizontal; also a device that ascertains level
Level Payment Mortgage 2 likes
Mortgage with the same monthly payments over the lifespan of the loan
Lien 4 likes
An impediment that usually uses real or personal property as the security for payment of a debt
Lien Release 2 likes
Document from a contractor to the owner that discharges a mechanic’s or material lien after the issues have been resolved
Lien Waiver 2 likes
Document from a contractor, subcontractor, material supplier or construction professional who has lien rights against an owner’s property, discharging all or part of those rights
Lien waivers are usually employed to process progress payments to prime contractors or subcontractors as a Conditional Lien Waiver, Unconditional Lien Waiver, and Final Lien Waiver
Lien, Mechanic’s or Material 2 likes
The right to take, hold or sell an owner’s property to satisfy outstanding debts to an authorized contractor for labor, materials, equipment or services; See Preliminary Lien Notice
Light 2 likes
Space in a window sash for a pane of glass; also a pane of glass
Limit Switch1 like
limit switch
Safety control that automatically turns off a furnace when it gets too hot; also control blower cycles
Lineal Foot 0 likes
A unit to measure lumber that equals 1 inch thick by 12 inches wide by 12 inches long Examples: 1 inch x 12 inches x 16 feet = 16 board feet, 3 inches x 12 inches 16 inches = 48 board feet
Lintel 1 like
Horizontal structural component that supports the load over an opening such as a door or window
Load Bearing Wall 2 likes
Includes all external walls and any internal wall aligned above a support beam or girder; usually, a wall that has a double horizontal top plate
Loan 1 like
Amount borrowed
Loan to Value Ratio 4 likes
The ratio of the loan amount to the property valuation expressed as a percentage; if a borrower wants a loan of $300,000 on a property valued at $600,000 it has a 50 percent loan to value rate; if the loan were $450,000, the LTV would be 75 percent; the higher the loan to value, the greater the lender’s perceived risk
Lookout 2 likes
Short wood bracket or cantilever supporting the overhang part of a roof
Louver4 likes
A vented opening into a home with a series of horizontal slats that allow ventilation but exclude rain, snow, light, and insects
Lumens 0 likes
Unit to measure total light output; amount of light on a surface of one square foot
Lump Sum Bid 0 likes
Single sum of money to complete a construction without a cost breakdown
Lump Sum Contract 2 likes
Contract between an owner and contractor where the owner agrees to pay the contractor a specific amount of money for completing a scope of work made up of various unspecified items
Product of the day


Detergent, alkali, acid, or another cleaning substance Solvent for cleaning paint equipment



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