Every trade builds its own shorthand, and facility maintenance has more than most. This page explains the terms that turn up in our quotes, our closeout reports and the conversations property managers have with us, so nothing on an invoice needs decoding.

112 terms, grouped by trade. If something you have been asked about is missing, tell us and we will add it.

Contracting Locks and doors Carpentry and finishes Painting and surfaces Glass Lighting HVAC Refrigeration Electrical Plumbing Building

Contracting

Contracting terms

Additional insured: Status extending a contractor liability cover to another party, usually the building owner or manager. Distinct from being a certificate holder, which only entitles you to notice. Onboarding documents
Certificate holder: The party a certificate of insurance is issued to, entitling them to notice of cancellation. It does not by itself extend any cover to them. Onboarding documents
Change order: An agreed change to the scope or price after work has been authorized. Approved before the work continues, which is the point at which a scope change stops being a surprise. Reading the invoice
Closeout: The documentation filed when a job finishes. A closeout that says only "repaired unit" cannot support a warranty claim, settle a landlord and tenant dispute, or show that the same asset has now failed three times in a year. What a closeout should contain
COI (certificate of insurance): A one-page document from an insurer confirming a contractor carries active coverage, showing policy limits and dates. Most Miami office towers will not let a technician past the loading dock without one on file, and getting it lodged in advance is the difference between a job happening and a wasted visit. Why buildings ask for one
EIN (employer identification number): A federal tax identification number issued to a business, functioning much like a social security number does for an individual. Clients ask for it when setting a vendor up for payment. Our business details
General liability: Cover for third-party injury and property damage caused by a contractor. TrionX carries it for the work its own employees perform. What a COI proves
Licensed contractor: A contractor holding a state license in a trade Florida regulates, such as electrical, plumbing, HVAC, refrigeration or roofing. Required at any job size, with no small-job exception. What Florida licenses
Make-good: Restoring a surface after another trade has opened it up. A plumbing repair inside a wall is only half finished until the drywall is closed, finished and painted back. General maintenance
Permit: Authority from the building department to carry out specific work, with inspection to follow. A separate requirement from licensing, and both can apply to the same job. When a job needs one
Punch list: The standing list of small outstanding items on a property. Clearing a punch list in one scheduled visit costs far less than calling someone out for each item, because the travel dominates the cost of small jobs. Commercial handyman work
SLA (service level agreement): An agreed response time for a given priority of call. A four-hour SLA means a technician is on site within four hours of the request, not that the repair is finished within four. Questions worth asking a vendor
Trip charge: A fixed charge for attending, covering travel and vehicle time and separate from labor. Legitimate and normal, and worth agreeing before dispatch rather than reading on an invoice. How rates are built
W-9: The IRS form a business gives a client so the client can report payments made to it. Standard onboarding paperwork for any commercial vendor, and the normal moment to share an EIN. Vendor onboarding questions
Work order: The record of a single job, from the request through to completion. A useful work order identifies the specific asset, what was found, what was done, the parts used and what is recommended next. Reading the invoice that follows
Workers compensation: Cover for injury to a contractor own employees while working. The policy that matters most if somebody is hurt on your property, and an exemption is not the same as cover. Who carries what

Locks and doors

Locks and doors terms

Access control: Any arrangement granting entry by something other than a mechanical key, such as a keypad, card reader or fob. Usually fitted alongside conventional locks rather than replacing them. Locks and access control
Backcheck: The resistance a door closer applies near the end of the opening arc, which stops the door being thrown into the wall behind it. One of the three adjustments on most commercial closers. Reading a failing closer
Change key: The key that opens one door in a master key system and nothing else. This is the level most tenants and most staff should be holding. How the hierarchy works
Continuous hinge: A hinge running the full height of a door, spreading its weight along the whole edge instead of concentrating it on three knuckles. Usually the right answer on a high-traffic entrance. Why doors drop
Cylinder: The part of a lock the key turns. Rekeying changes the pins inside it and leaves the rest of the hardware on the door untouched. Rekey or replace
Dogging: A feature holding an exit device latch retracted so the door pushes open freely. Useful during trading hours on an unrated door, and never permitted on a fire rated one. What an inspector checks
Door closer: The mechanism controlling how a door shuts. Across commercial property these generate more service calls than broken glass does, because a door gets used hundreds of times a day. What a failing closer tells you
Door coordinator: A device on a pair of doors ensuring the leaves close in the correct order so the latch can engage. A common finding when a pair no longer latches reliably. Fire door inspection
Electric strike: A strike plate that can be released electrically, letting a door be opened by a reader or a button. Available in both power-off behaviors, and often configurable on site. Fail-safe or fail-secure
Fail-safe: An electric lock that unlocks when power is removed, so it needs power to stay locked. Safe refers to life safety, meaning people can still get out. What happens in a power cut
Fail-secure: An electric lock that stays locked when power is removed, so it needs power to release. Correct where free exit is guaranteed mechanically by a handle on the inside. What happens in a power cut
Fire door assembly: A rated door, frame, hinges, closer and latch certified to perform together. The door has to close and latch under its own power for the rating to hold, which is what an inspector tests. Closers and latching
Floor closer: A door closer set into the floor beneath the door, with a pivot at the bottom edge instead of an arm on the frame. Common on glass and heavy entrance doors, and a failing one shows as oil on the floor and a door that drifts shut or will not latch. A glass door that drags
Hold-open device: A device holding a fire door open and releasing it on alarm activation, so the door closes when it matters. A wedge is not a hold-open device. Fire door inspection
Key register: The record of every key issued against a system: its stamp, the doors it operates, who holds it, and the dates it went out and came back. A master key system cannot be audited without one. Keeping the register straight
Magnetic lock: A lock holding a door with an electromagnet and no mechanical latch. Inherently fail-safe, and carrying requirements around exit request, marked release and alarm release. Fail-safe or fail-secure
Master key system: A hierarchy of keys in which one key opens a defined group of doors while each door keeps a key of its own. Depends on a controlled keyway and a maintained register to stay meaningful. Setting one up
Opening force: How much effort it takes to open a door, measured with a gauge at the handle. Limited on accessible routes, and usually pushed over the limit by a closer wound up to force a latch. The accessibility limit
Panic hardware: A push bar that releases an exit door in a single motion without a key. Required on certain exits according to occupancy and occupant load, and among the first things an inspector checks. Doors and hardware
Rekeying: Repinning a cylinder so that a different key operates it. Every key cut to the previous combination stops working, which is what makes it the standard response to a departure. When rekeying is enough
Request-to-exit: A sensor or button releasing an electrically locked door from the inside, so leaving needs no credential. One of the provisions that makes a magnetically locked door acceptable. Electric locking behavior
Restricted keyway: A keyway whose blanks are supplied only to the registered holder of the system, so duplication needs that holder’s authorization rather than a walk to a hardware counter. Why the keyway matters
Strike plate: The plate in the frame the latch engages. Filing it to make a misaligned door latch is a temporary fix that hides the real fault from whoever looks next. Alignment work

Carpentry and finishes

Carpentry and finishes terms

Backing: Timber or steel fixed inside a wall before it is closed up, so that something can be screwed to that spot later. Its absence is why a heavy fixture cannot always go where you want it. Office turnover carpentry
Ceiling grid: The metal framework a suspended ceiling sits in. Bent sections and cut tiles around services are among the most visible signs of a build-out that was removed carelessly. Turnover punch lists
Corner bead: The metal or plastic edge fixed to an external drywall corner before finishing. Damaged bead is why a corner looks chewed, and patching over it without replacing it never lasts. Drywall repair after a leak
Drywall: Gypsum board fixed to studs to form a wall or ceiling surface. It wicks water upward from a wet base, which is why a wall can look dry at eye level and not be. Repair after a leak
Joint compound: The filler used over drywall joints and repairs. Applied in three thin coats rather than one thick one, with sanding between, which is most of the difference between a patch you see and one you do not. Patching that does not show
Millwork: Fitted joinery made for a specific space: counters, cabinetry, shelving and paneling. Distinct from stock units, and repaired rather than swapped when it is damaged. Salon cabinetry and finishes
Substrate: Whatever a finish is applied to: the board behind paint, the wall behind tile, the masonry behind stucco. Most finish failures are substrate failures wearing a different name. When paint is the wrong answer
Taping: Bedding paper or mesh tape into compound across a drywall joint so the seam does not crack. Relying on filler alone is why a patch reappears as a hairline in a year. Patching that does not show
Texture matching: Reproducing an existing wall finish, such as orange peel or knockdown, across a repair. Matched in both pattern and coarseness, and worth testing on a scrap first. Repair after a leak

Painting and surfaces

Painting and surfaces terms

Adhesive failure: Sealant that has let go of one side of a joint, leaving a visible gap along the edge. Water goes straight in behind it while the bead still looks intact from a distance. Reading a failed joint
Backer rod: Foam rod fitted into a joint before sealing, setting the depth so the sealant bonds to two faces rather than three. Without it the bead tears instead of stretching. Sealing a joint properly
Biological growth: Algae, mold and mildew on shaded and north-facing surfaces. Routine in this climate rather than a sign of neglect, and it returns within a year unless it is killed at the root. What washing fixes
Chalking: Powdery residue on an exterior wall, left on the hand when you run it down the surface. The binder has broken down under ultraviolet, and it is the point at which a wash and recoat is still straightforward. When to repaint
Cohesive failure: Sealant that has split down its own middle rather than letting go of the substrate. Usually means the joint was too narrow for the movement it has to absorb. Reading a failed joint
Efflorescence: White crystalline deposit on masonry, left when water moves through the material and evaporates at the surface. A symptom of water movement rather than a cosmetic problem. Sealing where water is getting in
Elastomeric coating: A thick flexible exterior coating able to bridge hairline cracking as a wall moves. Common on Florida stucco, and dependent on preparation in a way ordinary paint is not. Condo common area painting
Sealant joint: The flexible seal where two materials meet or where a building is designed to move. The shortest-lived component in the envelope, and the first place water gets in. The maintenance nobody schedules
Soft washing: Cleaning at low pressure using a solution and dwell time, so chemistry lifts the growth and water only rinses. The correct method on stucco, paint and any surface with sealant joints. Pressure, and its limits
Stain-blocking primer: A primer that seals soluble deposits so they cannot bleed through the finish coat. Skipping it is the usual reason a repaired water stain reappears within a month. Why the stain came back

Glass

Glass terms

Annealed glass: Ordinary untreated glass, which breaks into large sharp shards. Not permitted in safety-glazing locations such as doors, sidelights and low glazing. Which glass goes where
Board-up: Temporary paneling securing a broken opening until glass can be measured, ordered and fitted. A separate job from the replacement, running on a much shorter clock. What happens in a board-up
Design pressure: The wind load a product must be rated for at a specific position on a specific building. Corners and upper floors carry higher pressures than the middle of a low elevation. Permits and approvals
Glazing bead: The strip that holds a pane in its frame, snapped or screwed in around the glass. It comes out first when a pane is replaced, and a bead that is bent or missing leaves the glass loose in the opening. What re-glazing involves
Impact-rated: Glazing certified to withstand windborne debris, required in parts of South Florida under the building code. Not interchangeable with ordinary tempered glass. Storefront glass Downtown
Insulated glass unit: Two or more panes separated by a sealed gap, made to control heat transfer. An assembly rather than a glass type, and the panes inside it can be tempered or laminated. Which glass goes where
Laminated glass: Two panes bonded to an interlayer, so the glass holds together when broken. Used where security or impact resistance matters, including hurricane-rated openings. Identifying a pane from how it broke
NOA (notice of acceptance): Miami-Dade County product approval, covering a specific product in a specific configuration including glass, frame and anchors. It approves the assembly rather than the material. What needs a permit
Patch fitting: A metal fitting clamped to the edge or corner of a frameless glass door, holding the door on its pivot and carrying the lock or closer. A loose fitting lets the door drop, and a dropped door can chip or crack its own glass. A glass door that drags
Re-glazing: Replacing the glass in an existing frame without altering the opening. Maintenance rather than construction, which is why it needs no permit and no contractor license. Commercial glass
Sealed unit failure: Breakdown of the perimeter seal on an insulated unit, letting moisture condense between the panes. It cannot be cleaned or repaired, so the unit is replaced. Why the glass is fogged
Tempered glass: Heat-treated safety glass that breaks into blunt granules rather than shards. Standard for most commercial storefront openings. Commercial glass

Lighting

Lighting terms

Ballast and driver: The components regulating current to a lamp. Fluorescent fittings use a ballast, LED fittings use a driver, and both fail well before the fixture itself does. Lighting maintenance
Exit and emergency lighting: Fixtures that illuminate escape routes when power fails. They carry specific testing and record-keeping requirements, and a fire marshal will check them early. 24/7 emergency response
Group re-lamping: Replacing a whole run of lamps at once rather than individually as each fails. One mobilization instead of six, and it ends the trickle of complaints from a slowly darkening space. Lot lighting in Kendall
High-bay: A fixture designed for ceilings above roughly twenty feet, typical in warehouses. Replacement is an access problem before it is an electrical one, since it needs a lift and a cleared aisle. Warehouse lighting
LED retrofit: Converting existing fittings to LED. Payback depends on run hours and electricity rate, so a parking lot burning dusk to dawn pays back far faster than an office lit forty hours a week. Working out the payback

HVAC

HVAC terms

Air handler: The part of a system that moves conditioned air through the ductwork, containing the blower and the evaporator coil. In a split system it sits indoors while the condenser sits outside. Where a blocked condensate line ends up
Condensate line: The drain carrying water away from the evaporator coil. A blocked line is a nuisance overflow in mild weather and a ceiling collapse during a humid Miami August. The tower version of this failure
Condenser coil: The outdoor coil that rejects heat from the refrigerant. Coastal Miami properties corrode these faster than the manufacturer schedule assumes, and a fouled or corroded coil forces the compressor to work against high head pressure. Checking a unit that is not cooling
Curb: The raised frame a rooftop unit sits on. The seal between unit and curb is what keeps water out, and it degrades faster under Miami sun than most maintenance plans assume. Before the season
Head pressure: The pressure the compressor works against on the discharge side. Persistently high head pressure, usually from a dirty coil or restricted airflow, is the most common route to a burnt-out compressor. Why coils matter after a storm
Make-up air: Conditioned outside air deliberately supplied to replace what an exhaust hood removes. Without enough of it a kitchen runs under negative pressure and pulls hot air in from everywhere else. Kitchen ventilation
Preventive maintenance: Scheduled servicing intended to prevent failures rather than react to them. On refrigeration in particular the arithmetic is straightforward, since the stock inside one walk-in is usually worth more than a year of scheduled visits. Building a schedule that gets followed
RTU (rooftop unit): A packaged air conditioning unit mounted on a roof, containing compressor, condenser and air handling in one cabinet. The standard arrangement for retail, restaurant and light industrial buildings across Miami-Dade. Commercial HVAC in Miami
Short cycling: Equipment starting and stopping rapidly instead of running a full cycle. Each start draws high current, so a compressor cycling six times an hour will not last as long as one cycling twice. What to check when cooling stops

Refrigeration

Refrigeration terms

Blast chiller: Equipment that pulls cooked product down through the temperature danger zone quickly, in a window set by food safety rules. A unit that still gets cold but no longer chills fast enough is a compliance failure even though nothing looks broken. Production refrigeration in Hialeah
Defrost cycle: The programmed period when an evaporator is warmed to clear accumulated ice. Set for the wrong load or defeated by a failed heater, it produces ice build-up that gets blamed on the refrigeration rather than the control. Signs a walk-in is about to fail
Door gasket: The flexible seal around a refrigeration door. Cheap, dull, and behind a surprising share of compressor failures, because a unit running continuously to compensate for a leaking door eventually gives up. Cooler door hardware
Refrigerant leak: Gradual loss of charge from a sealed system. Performance declines slowly rather than stopping, so the compressor works harder for months before anyone notices, which is why leak detection belongs on a scheduled visit. Spotting one early
Temperature danger zone: The band between roughly 41 and 135 degrees Fahrenheit, where bacteria multiply fastest in food. Refrigeration exists to keep product below it and hot holding to keep product above it, so an excursion into the zone is what a health inspector is really looking for in a log. A walk-in that is climbing tonight
Temperature log: The record of readings taken from refrigerated equipment. Required for health department files, and genuinely predictive: a slow upward drift across several weeks is what a failure looks like before it happens. Grocery refrigeration
Walk-in cooler: A refrigerated room used for bulk food storage. Failures rarely happen without warning, and the early signals are usually a door that has stopped sealing or a condenser nobody has cleaned. Restaurant refrigeration

Electrical

Electrical terms

Ballast bypass: Removing or bypassing a ballast so an LED lamp is fed directly. Rewiring the fixture, so it is licensed electrical work rather than a relamp, however simple it looks. Relamp or retrofit
Dedicated circuit: A circuit serving one piece of equipment and nothing else. Commercial kitchen equipment, IT rooms and signage generally need one, and sharing a circuit is a common cause of recurring nuisance tripping. When part of a building loses power
Disconnect: A local switch isolating a piece of equipment from its supply. Water in a rooftop disconnect is among the most common causes of equipment failing to start after a storm. What needs an electrician
Nuisance tripping: A breaker repeatedly cutting power without an obvious fault. Usually a capacity problem rather than a faulty breaker, which is why replacing the breaker tends to book the same call again a month later. undefined
Panel: The enclosure distributing electrical supply through a building via circuit breakers. Plenty of older Miami commercial space runs panels sized for far lighter loads than the current tenant imposes. Commercial electrical
Three-phase power: A supply arrangement used for larger commercial and industrial equipment. Common through Doral and Hialeah, where losing a phase can stop an entire production or distribution operation. Three-phase work in Doral

Plumbing

Plumbing terms

Backflow prevention: A device stopping used water being drawn back into the clean supply. Commercial properties are generally required to have these tested on a schedule. Commercial plumbing
Grease trap: A vessel intercepting fats and oils before they reach the sewer. Required on commercial kitchens, inspected by the health department, and unpleasant when neglected. What fails, and why
Hydro-jetting: Clearing a drain line with high-pressure water rather than a mechanical auger. More thorough on grease-heavy restaurant lines, where a cabled clear often reopens the same blockage within weeks. Grease lines in Wynwood
P-trap: The curved section under a fixture that holds standing water and blocks sewer gas from entering the building. A dry trap in a rarely used floor drain is a common source of unexplained smells. A drain or toilet backing up

Building

Building terms

Building envelope: Everything separating conditioned interior from outside: walls, roof, glazing, doors and the joints between them. Coatings and sealant are part of it rather than decoration. Coatings as envelope
Common element: The shared parts of a condominium: structure, roof, corridors, lobbies and systems serving more than one unit. Association responsibility, funded through assessments. Association or owner
Facility management platform: Software a national client uses to dispatch and track work orders across many sites. Vendors are expected to accept work, post updates and file closeout documentation inside the platform. Choosing a vendor
Limited common element: Something serving one unit but sitting outside it, such as a balcony, terrace or assigned space. The category producing the most repair disputes, because responsibility is often split. Association or owner
Means of egress: The route people leave a building by, from any point to the outside. Its hardware, lighting, signage and clearance are all inspected as one system rather than separately. Exit device checks
Multi-tenant: A property let to several occupiers. The first question on any repair is usually administrative rather than technical: whether the fault sits with the structure, the landlord or the tenant. Who pays for what
Negative pressure: A space where more air is extracted than supplied, so air is pulled in from wherever it can be. Doors pull hard, pilot lights blow out and adjoining rooms get dragged in. Why the kitchen is hot
Parapet: The wall extending above roof level at the edge of a building. Its coping and joints sit in the worst position for sun and water, and they leak into the wall below. Roof checks
Scupper: An opening letting water drain off a flat roof through the parapet. Blocked scuppers are the most common route for storm water into a commercial building. Storm preparation
Stack effect: Air movement driven by temperature difference between the inside and outside of a tall building. It puts lobby doors under pressure and can make them measurably harder to open. Doors that open hard
Tenant improvement: Alterations fitting a space to an incoming occupier. Frequently needs electrical capacity, lighting layout and plumbing changes together, which is where a single vendor saves the most scheduling. Build-outs in converted buildings

Commercial maintenance glossary