iSpec LLC

Stands for the Americans with Disabilities Act — a federal law requiring buildings and public spaces to be accessible to people with disabilities. ADA compliance affects layout, clearances, fixture heights, and door widths in both commercial and residential construction.

Granular materials such as sand, gravel, or crushed stone used as a base layer, mixed into concrete, or applied as a surface material. The size and type of aggregate affects the strength and finish of concrete.

A one-way mechanical valve that allows air into a drain line to prevent siphoning of the trap seal, eliminating the need for a traditional vent pipe through the roof. AAVs are commonly used to vent island and peninsula sinks where conventional venting is impractical.

A pneumatic button installed at the countertop that uses air pressure to toggle a garbage disposal on and off. Air switches eliminate the need for a traditional wall switch near the sink.

A person learning a skilled trade through on-the-job training combined with classroom instruction. Apprenticeships in construction trades such as electrician, plumber, and carpenter typically last three to five years.

A method of alternative dispute resolution in which a neutral third party reviews the facts of a dispute and issues a binding or non-binding decision. Many construction contracts include arbitration clauses as an alternative to litigation.

The licensed architect legally responsible for the design documents submitted for a building permit. They ensure the design meets all applicable codes and standards.

Updated construction drawings that reflect all changes made during the building process, showing the project exactly as it was constructed rather than as originally designed.

A drilling tool with a helical shaft used to bore holes in soil, wood, or other materials. In construction, power augers are commonly used to drill holes for fence posts, deck footings, and pier foundations.

A protective and decorative surface installed on the wall between a countertop and upper cabinets, most commonly in kitchens and bathrooms. Backsplashes are typically made of tile, stone, glass, or metal and protect the wall from water and grease.

An exhaust fan installed in a bathroom ceiling or wall to remove moisture, odors, and steam. Modern bath fans may include built-in features such as lighting, humidity sensors, or Bluetooth speakers.

A horizontal structural member that spans an opening and supports loads from above, such as floors, roofs, or walls. Beams are typically made of wood, steel, or engineered lumber.

The location where a structural member such as a beam or header transfers its load to the support below — typically a column, post, or foundation. Bearing points must be designed to handle the concentrated weight without crushing or shifting.

A wall that carries the structural weight of the building above it down to the foundation. Removing a bearing wall without proper support can compromise the integrity of the entire structure.

A formal proposal submitted by a contractor outlining the cost and scope of work for a project. Always compare multiple bids to ensure competitive and fair pricing.

An exterior siding style made of wide vertical boards with narrow strips (battens) covering the seams between them. Board and batten is a traditional look commonly used on additions, gables, and accent walls.

A financial guarantee that a contractor will fulfill their contractual obligations. Common types include bid bonds, performance bonds, and payment bonds — all of which protect the project owner if the contractor fails to perform.

A violation of the terms of a contract. In construction, a breach may occur when a contractor fails to complete work on time, delivers substandard work, or does not meet specified requirements outlined in the contract documents.

The process of finishing or customizing an interior space, commonly used in commercial construction when a tenant transforms a raw space to suit their needs.

A set of regulations established by local or state governments that governs the design, construction, and safety standards of buildings. All projects in Columbus, Ohio must comply with applicable building codes.

A recessed light fixture installed into a ceiling so that the housing sits above the ceiling plane and the light shines downward through a round opening. Can lights provide clean, unobtrusive ambient or task lighting.

A structural condition where a beam, joist, or floor system extends beyond its supporting wall or foundation. Cantilevered sections are supported on only one end and must be engineered to handle the unsupported load without deflection.

A skilled tradesperson who works with wood and other structural materials to build, install, and repair structures. Carpenters handle framing, finish work, cabinetry, trim, and formwork.

A heavy, durable pipe material used in drain, waste, and vent systems. Cast iron is valued for its sound dampening and fire resistance but is susceptible to corrosion over time, especially in systems that sit unused.

A flexible sealant applied to joints, seams, or gaps in a structure to prevent air, water, or insects from penetrating. Caulking is used around windows, doors, plumbing penetrations, and exterior trim.

The overhead interior surface of a room. Ceilings can be flat, vaulted, coffered, or dropped, and are typically finished with drywall, plaster, or tile.

A rigid panel made of cement and reinforcing fibers used as a tile substrate in wet areas such as showers, tub surrounds, and kitchen backsplashes. Cement board resists moisture and provides a stable surface for thin-set tile adhesive.

An official document issued by a local government agency confirming that a building meets all codes and is safe for occupancy. Required before moving into a newly constructed or significantly renovated space.

A horizontal molding installed on a wall at roughly the height of a chair back — typically 30 to 36 inches above the floor. Chair rail serves as both a decorative element and a transition between different wall treatments above and below.

A written amendment to the original construction contract that documents any changes to the scope, cost, or timeline of a project. Always get change orders in writing.

A hand tool with a flat, sharpened metal blade used to cut, shape, or carve wood, stone, or masonry. Chisels are used in finish carpentry, masonry work, and demolition.

A concrete masonry unit made with coal cinders or lightweight aggregate, commonly used for foundation walls and exterior walls in older residential construction. Modern equivalents are typically called CMU or concrete block.

Stands for concrete masonry unit — a precast concrete block used to build walls, foundations, and structural partitions. CMU is one of the most common materials in commercial construction, used in everything from fire-rated walls to infill applications.

A set of rules and standards established by government authorities that govern the design, construction, and maintenance of buildings. Building codes exist to protect public health, safety, and welfare.

A vertical structural support member that transfers load from beams or slabs above down to the foundation below. Columns can be made of wood, steel, or concrete.

The act of meeting the requirements of applicable building codes, regulations, and standards. All construction work must be in compliance before inspections can be passed and certificates of occupancy issued.

A building material made from a mixture of cement, water, sand, and aggregate that hardens into a strong, durable solid. Concrete is used for foundations, slabs, walls, and structural frames.

A reserved portion of the project budget set aside to cover unexpected costs or changes that arise during construction. Typically 10–15% of the total project cost.

A legally binding agreement between two or more parties that outlines the terms, conditions, obligations, and expectations of a construction project. A well-written contract protects both the owner and the contractor.

The complete set of documents that define the terms of a construction project, including drawings, specifications, and the signed agreement between owner and contractor.

A construction delivery method where the contractor builds the structural framework and exterior of a building, leaving interior finishes for a later phase or tenant.

A large piece of equipment used to lift and move heavy materials on a construction site. Cranes are essential for placing steel beams, roof trusses, precast concrete panels, and other oversized loads.

A shallow, unfinished area beneath the first floor of a building that provides access to plumbing, electrical wiring, and structural components without a full basement.

A decorative trim installed at the joint where walls meet the ceiling. Crown molding is available in wood, MDF, plaster, and polyurethane and is used to add a finished, polished look to a room.

The permanent, fixed weight of a building's structural components, such as beams, floors, and walls. Engineers account for dead loads when designing a structure.

A project delivery method where a single contractor is responsible for both the design and construction of a project, streamlining communication and reducing costs and timelines.

A roofed structure containing a window that projects vertically from the slope of a roof, adding light, ventilation, and usable space to an upper floor or attic.

A ventilation system that pulls cooking fumes downward and exhausts them through ductwork routed under the floor, rather than through an overhead hood. Downdraft vents are commonly used on peninsula and island cooktops where a range hood would block sight lines.

A complete collection of architectural and engineering drawings used to guide the construction of a project, including floor plans, elevations, and structural details.

A 90-degree plumbing fitting with mounting flanges that allow it to be screwed directly to a stud or blocking inside the wall. Drop elbows are most commonly used to secure the water supply connection behind a shower head.

A panel made of gypsum plaster pressed between two sheets of heavy paper, used to form interior walls and ceilings. Also called gypsum board or sheetrock, drywall is the most common interior wall finish in residential and commercial construction.

A horizontal siding profile where each board has a concave notch along the top edge, creating a shadow line and adding visual depth to the exterior of a home. Dutch lap is a traditional style found on many older homes.

The lower edge of a roof that overhangs the wall of a building. Eaves direct rainwater away from the structure and provide shade to windows and walls below.

A means of exit from a building or room in the event of an emergency. Building codes specify minimum requirements for egress windows, doors, and pathways to ensure occupants can safely evacuate.

The main distribution box where incoming electrical power is divided into individual circuits that serve different areas of the building. The panel contains circuit breakers that protect each circuit from overload.

A licensed tradesperson who installs, maintains, and repairs electrical systems in buildings. Electricians work from blueprints to run wiring, install panels, outlets, fixtures, and ensure compliance with electrical codes.

A scaled, flat drawing showing the exterior or interior face of a building or wall. Used by designers and contractors to visualize vertical surfaces and finishes.

Stands for ethylene propylene diene monomer — a synthetic rubber membrane used as a roofing material on flat and low-slope commercial roofs. EPDM is durable, weather-resistant, and commonly installed in large sheets that are adhered or mechanically fastened.

A decorative cover plate that fits around a pipe, valve, or fixture where it passes through a wall or floor. Escutcheons hide the rough opening and give the penetration a clean, finished appearance

The process of digging and removing earth to prepare a site for a foundation or underground utilities. Often one of the first physical steps in new construction.

A heavy construction machine with a rotating cab and a hydraulic arm used for digging, demolition, and material handling. Excavators are used to dig foundations, trenches, and grade sites.

The front-facing exterior of a building. The facade is the primary visual face of the structure and typically includes the main entrance, windows, and exterior finish materials.

A detailed document specifying all interior finishes for a project, including flooring, paint colors, tile selections, hardware, and fixtures.

An automatic system mounted inside a commercial kitchen hood that detects and extinguishes grease fires by deploying a chemical agent onto the cooking equipment. The type of suppression system must match the cooking equipment it serves.

Thin strips of metal or other waterproof material installed at joints and intersections in a roof or wall to prevent water infiltration. Common locations include around chimneys, skylights, windows, and roof valleys.

A concrete base placed below the frost line that supports the foundation wall or columns of a structure. Footings distribute the weight of the building across the soil beneath.

The area of land covered by a building's foundation or ground floor. Expanding a building's footprint typically requires additional permits and approvals.

A supervisor who oversees a crew of workers on a construction site. The foreman coordinates daily tasks, ensures work meets quality standards, and communicates between the project manager and field workers.

The structural base of a building that transfers its weight to the ground. Common types include slab, crawl space, and full basement foundations.

The structural skeleton of a building, typically made of wood or steel, that supports walls, floors, and the roof. Framing defines the shape and layout of the structure.

A heating appliance that warms air and distributes it through ductwork to heat a building. Furnaces are powered by natural gas, propane, oil, or electricity and are the most common heating system in residential construction.

The process of attaching strips of wood or metal to a wall, ceiling, or other surface to create a level plane for finishing or a cavity for insulation and wiring. Furring is commonly used on masonry walls to provide a flat surface for drywall.

The triangular portion of a wall between the edges of a sloping roof. Gable ends are a common roof style in residential construction and provide attic ventilation.

Steel pipe coated with a layer of zinc to resist corrosion, once the standard for residential water supply and drain lines. Galvanized pipe is no longer used in new construction and is typically replaced when encountered during renovation due to its tendency to corrode and restrict flow over time.

The primary contractor responsible for overseeing and managing all aspects of a construction project, including hiring and coordinating subcontractors, managing the budget, and ensuring the project is completed on time and to specification.

A safety device that monitors the flow of electrical current through a circuit and shuts off power when it detects current leaking along an unintended path — such as through a person or through water. GFCIs are designed to react fast enough to prevent serious injury or electrocution. The International Residential Code requires GFCI protection on all 125-volt, 15- and 20-ampere receptacles in kitchens, bathrooms, garages, crawl spaces, unfinished basements, outdoor locations, and anywhere within six feet of a sink. GFCIs are the outlets with the small "test" and "reset" buttons on the face.

A large horizontal beam that supports other structural members such as floor joists. Girders are typically made of steel, engineered lumber, or built-up dimensional lumber and carry heavier loads than standard beams.

The process of leveling or sloping the ground around a building site to ensure proper drainage and a stable foundation.

The total floor area of a building measured from the exterior walls, including all interior spaces such as hallways, closets, and mechanical rooms.

A mortar-like material used to fill the joints between tiles, stones, or masonry units. Grout seals the gaps between tiles, prevents moisture infiltration, and provides a finished appearance.

The direct construction costs of a project, including labor and materials. Distinguished from soft costs such as design fees, permits, and financing.

A condition or situation on a construction site that poses a risk of injury or illness to workers. Identifying and mitigating hazards is a core responsibility of every contractor and site supervisor.

A horizontal structural member placed above a door, window, or other opening in a wall to carry the load from above and transfer it to the surrounding framing.

A pattern made of rectangular units arranged in a staggered zigzag, commonly used in tile backsplashes and flooring. The interlocking pattern adds visual texture and is a popular choice for kitchens and bathrooms.

The exhaust ventilation assembly installed above commercial cooking equipment to capture and remove grease-laden vapors, smoke, and heat. Hood systems are typically installed by a specialized contractor and must be coordinated with the cooking line layout.

A pump that circulates hot water through the supply lines so hot water is available at every fixture without waiting for it to travel from the water heater. Essential in commercial kitchens where the tank may be located far from the fixtures.

Stands for Heating, Ventilation, and Air Conditioning. Refers to the systems that regulate temperature, airflow, and air quality within a building.

A lifting device that uses hydraulic pressure to raise heavy loads. In construction, hydraulic jacks are used to lift structures, level sagging floors, set beams, and temporarily support loads during structural repair work.

An engineered wood framing member shaped like the letter I, with a plywood or OSB web sandwiched between two LVL or solid lumber flanges. I-joists are lighter, straighter, and capable of spanning longer distances than dimensional lumber.

A contractual obligation in which one party agrees to compensate another for losses, damages, or legal costs arising from specified events. Indemnification clauses are standard in most construction contracts.

An official review of construction work by a local building authority to verify it meets applicable codes and approved plans. Inspections are required at key phases — including foundation, framing, rough-in, and final — before work can proceed.

Material used to reduce heat transfer through walls, ceilings, and floors. Common types include fiberglass batts, spray foam, and rigid foam board. Proper insulation improves energy efficiency and occupant comfort.

A horizontal framing member used to support a floor or ceiling. Joists run parallel to each other and transfer loads to beams, walls, or foundations below.

A metal bracket used to connect the end of a joist to a beam, header, or ledger board. Joist hangers provide a secure structural connection and eliminate the need for the joist to rest on top of the supporting member.

An enclosed box where electrical wires are connected, spliced, or branched. Junction boxes must remain accessible after construction — they cannot be permanently buried behind drywall or other finished surfaces.

A short wall, typically under four feet tall, that extends from the floor to a countertop, bar surface, or the underside of a sloped ceiling. Knee walls are commonly used in attics, bars, and kitchens to define spaces without closing them off.

An early method of electrical wiring that uses ceramic knobs and tubes to run individual conductors through framing. Knob-and-tube wiring is outdated and most municipalities require it to be removed when exposed during renovation.

A general construction worker who performs manual tasks such as site cleanup, material handling, demolition, and assisting skilled tradespeople. Laborers are essential to keeping a job site running efficiently.

A synthetic countertop or flooring material made by bonding layers of paper or fabric with resin under heat and pressure. Laminate is an affordable and widely available option, though it is less durable than stone or solid-surface alternatives.

A stone countertop finish that has a soft, textured surface with a matte sheen, created by brushing the stone with diamond-tipped brushes after honing. Leathered finishes hide fingerprints and water spots better than polished stone while adding a tactile quality.

A tool used to determine whether a surface is perfectly horizontal (level) or vertical (plumb). Levels range from simple bubble vials to digital laser levels used on large commercial projects.

Legal responsibility for damages, injuries, or losses that occur as a result of construction work. Contractors carry liability insurance to protect themselves and their clients from financial losses due to accidents or errors.

A legal claim placed on a property by a contractor, subcontractor, or supplier who has not been paid for work or materials provided. A lien can prevent the property from being sold or refinanced until the debt is resolved.

A legal document signed by a contractor or subcontractor confirming they have received payment and waiving their right to place a lien on the property for that portion of work.

A predetermined amount of money specified in a contract that a contractor must pay to the owner for each day a project extends beyond the agreed completion date. Liquidated damages clauses incentivize on-time delivery.

A wall that supports the weight of the structure above it. Removing or modifying a load-bearing wall requires careful engineering and structural reinforcement.

Wood that has been processed and cut into standardized planks and boards for use in construction. Dimensional lumber such as 2x4s and 2x6s forms the structural framing of most residential buildings.

Stands for laminated veneer lumber — an engineered wood product made from thin layers of wood veneer glued together with the grain running in the same direction. LVL is used for beams, headers, and other structural members where high strength and long spans are needed.

Stands for luxury vinyl plank — a durable, water-resistant flooring material designed to look like hardwood. LVP is a popular choice for rentals, kitchens, and high-traffic areas because it holds up to wear and moisture better than real wood.

A skilled tradesperson who works with brick, stone, concrete block, and other masonry materials. Masons build walls, chimneys, fireplaces, and decorative features using mortar and precision craftsmanship.

Stands for Mechanical, Electrical, and Plumbing — the three major building systems that make a space functional. MEP coordination is critical during both design and construction phases.

Custom wood products crafted for a specific project, such as cabinetry, trim, molding, shelving, and built-in furniture. A hallmark of high-end residential and commercial construction.

The process of identifying, removing, and treating mold growth in a building. Remediation typically involves cutting out materials that are too far gone and treating salvageable framing with antimicrobial solutions.

A workable paste made of cement, sand, and water used to bind masonry units such as brick, stone, or block together. Mortar hardens over time, creating strong, durable joints between units.

A layer of sand-and-cement mortar used to create a sloped surface for setting tile in a shower. Mortar beds allow for custom shower sizes and shapes that prefabricated pans cannot accommodate.

The process of building a completely new structure from the ground up, as opposed to renovating or remodeling an existing building. Requires full permitting, site preparation, and all phases of construction.

Stands for oriented strand board — an engineered wood panel made from compressed layers of wood strands bonded with resin. OSB is commonly used for wall sheathing, roof decking, and subfloor in both residential and commercial framing.

The Occupational Safety and Health Administration — a U.S. federal agency that sets and enforces standards to ensure safe and healthy working conditions. OSHA regulations govern fall protection, hazard communication, personal protective equipment, and more on all construction sites.

An interior non-load-bearing wall that divides a space into separate rooms or areas. Partitions can be moved or removed without affecting the structural integrity of a building.

A section of kitchen countertop and cabinetry that extends from a wall or existing counter, creating a three-sided workspace open on one end. Peninsulas add counter space, storage, and seating without taking up the floor area of a freestanding island.

An official approval issued by a local government authority allowing construction, renovation, or demolition to begin. Pulling the proper permits protects both the owner and contractor and ensures work is inspected and up to code.

Stands for cross-linked polyethylene — a flexible plastic tubing used for hot and cold water supply lines. PEX is commonly used in renovation work as a replacement for deteriorated copper or galvanized pipe.

A foundation system that uses individual concrete or masonry columns to support a structure above the ground. Pier foundations are common in additions, decks, and situations where a full perimeter foundation is not practical or cost-effective.

A wall and ceiling construction method used in homes built before the widespread adoption of drywall. Thin strips of wood called lath are nailed to the framing, and multiple coats of wet plaster are applied over them to form a hard, smooth surface.

A weight suspended on a string used to establish a true vertical reference line. The term "plumb" refers to being perfectly vertical, and is essential in framing, setting posts, and laying masonry.

A licensed tradesperson who installs and maintains piping systems for water supply, drainage, and gas in residential and commercial buildings. Plumbers work closely with inspectors to ensure all work meets code.

An engineered wood panel made from thin layers of wood veneer glued together with alternating grain directions. Plywood is used for structural sheathing, subfloors, roof decking, and cabinetry.

A concentrated force applied at a single location on a structural member, as opposed to a distributed load spread evenly across its length. Point loads occur where beams meet columns, where posts land on foundations, or where heavy equipment sits on a floor.

Stands for polyisocyanurate — a rigid foam insulation board used on roofs, walls, and foundations. Polyiso offers one of the highest R-values per inch of any insulation material and is commonly installed beneath roofing membranes on commercial flat roofs.

A dense, kiln-fired ceramic tile made from refined clay and fired at high temperatures, resulting in a hard and water-resistant surface. Porcelain tile is used for floors, walls, and countertops in both residential and commercial applications.

The individual responsible for overseeing the day-to-day progress of a construction project, coordinating between the owner, design team, and subcontractors to keep the project on schedule and on budget.

A list of outstanding items, touch-ups, or corrections that need to be completed before a project is considered fully finished and final payment is released.

A brand of circuit breaker panel that was common in homes built from the 1950s through the 1980s, identified by breakers that are pushed in to reset rather than flipped. Pushmatic panels are no longer manufactured and do not meet current electrical code, making replacement necessary during renovation.

An engineered stone countertop material made from crushed natural quartz bound with resin. Quartz countertops are nonporous, low-maintenance, and available in a wide range of colors and patterns.

A sloping structural member of a roof frame that extends from the ridge at the top to the wall plate at the bottom, supporting the roof decking and covering materials.

A ventilated enclosure installed above a cooktop or range to capture and exhaust smoke, grease, and cooking odors. Range hoods vent to the exterior through ductwork or recirculate filtered air back into the kitchen.

Light fixtures installed into the ceiling so the housing sits above the ceiling plane, with only the trim ring and lens visible from below. Recessed lighting provides clean, even illumination without hanging fixtures.

The process of improving, updating, or reconfiguring an existing structure or interior space. Can range from cosmetic updates to full structural changes and typically requires permits depending on scope.

A percentage of each payment withheld by the project owner until the project is substantially complete. Typically 5–10% of the contract value, retainage provides the owner leverage to ensure all work is finished to their satisfaction.

A formal document submitted during construction when clarification is needed on the drawings, specifications, or scope of work. RFIs keep communication clear and documented.

A brand name that has become the common term for nonmetallic sheathed electrical cable used in residential wiring. Romex contains insulated copper conductors and a ground wire inside a flexible plastic jacket, and is the standard wiring method in most homes.

The early stage of installing mechanical, electrical, or plumbing systems before walls are closed up. Rough-in work is inspected before being covered with drywall or finishes.

A foundation built from irregularly shaped stones, brick fragments, or other masonry debris set in mortar. Rubble foundations are found in older homes — particularly pre-1900 construction — and often require reinforcement or rebuilding during renovation.

A temporary elevated platform used to support workers and materials during the construction, maintenance, or repair of a structure. Scaffolding must meet strict safety standards to protect workers at height.

A wall-mounted light fixture that directs light upward, downward, or both. Sconces are commonly used in bathrooms, hallways, and accent lighting applications where overhead fixtures are not practical or desired.

A detailed written description of all the work to be performed on a project. A clearly defined scope of work protects both the owner and contractor and reduces the likelihood of disputes.

A substance applied to a surface to block the passage of fluids or air. Sealants are used on concrete, masonry, wood, and metal surfaces to protect against moisture, UV exposure, and wear.

The minimum required distance between a structure and a property line, road, or other boundary as specified by local zoning ordinances. Setbacks regulate how close a building can be placed to adjacent properties and streets.

Panels of plywood or oriented strand board (OSB) fastened to the exterior of a wall or roof frame to provide structural rigidity and a base for the exterior finish or roofing material.

A temporary support system used to hold up a structure or structural element while permanent work is being done beneath or around it. In renovation work, shoring is critical when removing bearing walls or replacing beams.

The mixing valve installed behind the shower wall that controls water temperature and flow. The valve body goes in during rough-in, and the visible trim — handle, escutcheon plate, and diverter — is installed after tile work is complete.

The horizontal piece of lumber that sits directly on top of the foundation and serves as the base for the wall framing above. Sill plates are treated for moisture and insect resistance since they are in direct contact with concrete or masonry.

The process of attaching a new piece of framing lumber alongside an existing damaged or undersized joist to restore or increase its load-carrying capacity. Sistering is a common structural repair in renovation work.

A window installed in a roof or ceiling to allow natural light into the space below. Skylights can be fixed or operable and require proper flashing and waterproofing to prevent leaks around the roof penetration.

A flat, horizontal concrete surface used as a floor or foundation. A slab-on-grade foundation is poured directly on the ground and is common in warmer climates.

A horizontal enclosure typically found where the wall meets the ceiling, often used to conceal ductwork, plumbing, or wiring. In kitchens, soffits are the boxed-out sections above upper cabinets that may need to be removed or reduced during a renovation.

A hardware feature built into cabinet hinges and drawer slides that uses a hydraulic damper to slow the door or drawer before it shuts, preventing slamming. Soft-close hardware is standard in most custom and semi-custom cabinetry.

An HVAC system with separate indoor and outdoor units connected by refrigerant lines. Split systems are common in both residential and commercial construction and include traditional furnace-and-AC setups as well as ductless mini-split heat pumps.

A light-gauge metal framing member used in place of wood studs, primarily in commercial construction. Steel studs are noncombustible, straight, and consistent in dimension, making them the standard for commercial interior partition walls.

A framed system of aluminum and glass panels used to form the front facade of a commercial building at street level. Storefront systems are engineered to hold large panes of glass and are typically installed by a specialized glazing contractor.

A vertical framing member in a wall, typically spaced 16 or 24 inches apart. Studs form the structural skeleton of walls and provide a surface to attach drywall, sheathing, and other finishes.

A specialized trade contractor hired by the general contractor to perform specific portions of the work, such as electrical, plumbing, HVAC, or tile installation.

The structural layer of plywood or oriented strand board (OSB) fastened to the floor joists beneath the finished flooring. The subfloor provides the flat, stable surface that supports tile, hardwood, LVP, or carpet.

Product data, samples, or shop drawings submitted by the contractor for review and approval by the architect or designer before materials are ordered or installed.

A rectangular ceramic or porcelain tile, traditionally 3 by 6 inches, originally used in New York City subway stations in the early 1900s. Subway tile is one of the most common wall tile choices for kitchens and bathrooms.

The senior field manager on a construction project responsible for day-to-day site operations, scheduling, safety, and quality control. The superintendent serves as the primary on-site representative of the general contractor.

The process of measuring and quantifying materials needed for a project from the construction drawings. Used by contractors and estimators to calculate accurate project costs.

The transfer of heat through a building element that is significantly more conductive than the surrounding materials. Common thermal bridges include wood studs in an insulated wall and uninsulated steel beams — both of which allow heat to bypass the insulation.

A stainless steel sink with three separate basins used in commercial kitchens to wash, rinse, and sanitize dishes and cooking equipment. Required by health departments in virtually all commercial food preparation facilities.

A surveying instrument used to measure horizontal and vertical angles on a construction site. Transits help establish accurate grades, alignments, and elevations before and during construction.

A pre-engineered structural framework made of triangular units used to support a roof or floor. Trusses are manufactured off-site and crane-set into place, making construction faster and more efficient.

A project delivery approach where the contractor handles everything from design through construction, delivering a fully completed and ready-to-use space to the owner.

The process of reviewing a project's design and materials to find cost-saving alternatives without compromising quality, functionality, or aesthetics.

A bathroom fixture that combines a sink basin with a countertop and storage cabinet below. Vanities are available in freestanding, wall-mounted, and built-in configurations and are a primary design element in most bathroom renovations.

A sheet of plastic, foil, or coated material installed to prevent moisture from passing through walls, floors, or ceilings. Vapor barriers are critical when converting unconditioned spaces like porches or basements into livable interior space.

An official exception granted by a local zoning board that allows a property owner or developer to deviate from the standard requirements of a zoning ordinance. Variances require a formal application and public hearing process.

A thin layer of high-quality material applied over a less expensive base. In construction, brick veneer refers to a single layer of brick applied to the exterior of a wood-framed wall for aesthetic purposes only — it does not carry structural load.

A basin that sits on top of a countertop rather than being recessed into it. Vessel sinks are a design choice that creates a furniture-like look in a bathroom and requires a wall-mounted or tall-deck faucet.

A wall treatment in which the lower portion of a wall is covered with wood panels, beadboard, or other material, typically extending 30 to 40 inches above the floor. Wainscoting adds texture and visual interest while protecting the lower wall from wear.

A written guarantee provided by a contractor that their work will meet specified standards and that defects discovered within a defined period after completion will be repaired at no additional cost to the owner.

The plumbing industry term for a toilet, or for the small enclosed room within a bathroom that houses the toilet behind its own door. Most building codes require every dwelling to include a water closet, a lavatory, and a bathtub or shower.

A sheet or liquid-applied material installed behind tile in wet areas to prevent water from reaching the framing and subfloor. Common products include Schluter Kerdi and Laticrete Hydro Ban.

A skilled tradesperson who joins metal parts together using heat and filler material. Welders are used extensively in structural steel construction, pipeline work, and custom metal fabrication.

A brand of structural wall sheathing with a built-in water-resistive and air barrier on its outer face. Zip sheathing eliminates the need for a separate house wrap, and its seams are sealed with manufacturer-specific tape to create a continuous building envelope.

A distressed or abandoned property, often acquired through a sheriff's sale, tax lien, or foreclosure auction. Zombie properties typically require extensive renovation — sometimes including full system replacement and structural repair — before they can be occupied or rented.

Local regulations that govern how land can be used and what types of structures can be built in a given area. Zoning laws affect building height, setbacks, density, and permitted uses.