Glossary, 134 terms
Home inspection terms: B
Each definition is the Key Term from the lesson named under it. Where two lessons define a term for different uses, both are here.
- Back hangs (rear track hangers)
- Angle iron pieces that fasten garage door tracks to the ceiling.
Lesson 7, Garage Vehicle Doors and Operators - Back rail
- A solid wood rail at the back of a better quality cabinet, through which the fasteners should go.
Lesson 18B, Cabinets, Countertops and Smart Home Scope - Backdraft
- Combustion products flowing into the house instead of out of the flue.
Lesson 39B, Combustion Air, Masonry Chimney Construction, Liners, Flue Area and Defects - Backdraft damper
- A damper in a kitchen exhaust duct, located at the fan or at the termination hood.
Lesson 16B, Dryer, Kitchen and Bathroom Exhaust - Backdrafting
- 1. The flow of combustion products from a fuel-burning appliance into the house.
Lesson 29, Air Distribution Systems, Ducts, Returns and Filters - 2. Combustion gasses that cool in a chimney or vent, become too heavy to rise to the top, and fall back into the house.
Lesson 30, Heating Fundamentals, Combustion and Capacity - 3. Combustion gasses falling back down a chimney or vent, which can let combustion products into the house.
Lesson 32A, Category I Gas Vent Systems and Vent Defects - 4. Combustion gasses falling back down a vent or chimney instead of leaving through it.
Lesson 32D, Oil Vent Systems - 5. Combustion gasses dropping back down a flue.
Lesson 40B, Draft Problems, Fireplace Inserts, Wood and Pellet Stoves - Backer block
- A wood block against the web of a carrying I-joist at a joist hanger, tight to the bottom flange with a top-mount hanger and to the top flange with a face-mount hanger.
Lesson 12B, I-Joists, SCL, Glulam and Floor Trusses - Backer flashing
- Flashing installed with counterflashing on the up-slope side of a rectangular skylight.
Lesson 10B, Skylights - Backfed circuit breaker
- The breaker through which a solar or wind system feeds electricity into a house panelboard.
Lesson 27B, Alternative Energy Systems: Solar PV, Wind and Solar Water Heating - Backfeeding
- Electricity flowing from a generator into the utility grid when the house is not disconnected from the grid.
Lesson 27A, Smoke and Carbon Monoxide Alarms, Load Controllers and Generators - Backflow
- 1. Contaminated flow into the water supply from an unintended source.
Lesson 34A, Plumbing Scope and Plumbing Terms - 2. Flow between a contaminate source and the water supply pipes through a cross-connection.
Lesson 35E, Standpipes, Floor Drains and Backflow Prevention - Backflow preventer
- A device that stops backflow.
Lesson 34A, Plumbing Scope and Plumbing Terms - Backflow preventers
- Mechanical devices that stop backflow where an air gap is impractical or impossible.
Lesson 35E, Standpipes, Floor Drains and Backflow Prevention - Backflow prevention device
- A device that should protect the water supply to an evaporative cooler; it is not often installed.
Lesson 28B, Cooling Systems: Inspecting Equipment and Typical Defects - Backpressure
- 1. An uncommon condition, which can occur when outside pressure exceeds water supply pressure.
Lesson 34A, Plumbing Scope and Plumbing Terms - 2. A cause of backflow in which the contaminate source is at a higher pressure than the supply pipes.
Lesson 35E, Standpipes, Floor Drains and Backflow Prevention - Backsiphonage
- 1. An uncommon condition, which can occur when negative pressure in supply pipes draws contaminants in.
Lesson 34A, Plumbing Scope and Plumbing Terms - 2. A cause of backflow in which negative pressure in the supply pipes draws water into them.
Lesson 35E, Standpipes, Floor Drains and Backflow Prevention - Backspan
- 1. The length of a cantilevered joist inside the house, 2 feet or more for each 1 foot of cantilever span.
Lesson 6A, Stoops, Porches and Balconies - 2. The part of a cantilevered floor on the inner side of its supporting wall.
Lesson 12A, Floor Framing, Spans, Bearing, Notching and Boring - Backsplash
- 1. The wall area from a countertop up to the wall cabinets.
Lesson 18B, Cabinets, Countertops and Smart Home Scope - 2. The wall behind a cooktop or range and at its sides.
Lesson 41A, Appliance Scope and Terms, Cooktops, Ranges, Ovens and Dishwashers - Backup (emergency) heating coils
- Heating coils, also called strips, installed with a heat pump in climates that often go below freezing; they resemble large toaster heating elements.
Lesson 28B, Cooling Systems: Inspecting Equipment and Typical Defects - Backup heat strips
- Electric heat strips that should activate when the outside air holds too little heat for a heat pump, usually in the 30s F.
Lesson 28A, Cooling Systems: Understanding the System - Backwash
- The softener cycle that flushes calcium and magnesium off the beads with brine and leaves sodium in their place.
Lesson 35F, Water Treatment Devices and Hot Water Circulation - Backwash disposal tube
- The tube that carries softener backwash water to a receptor.
Lesson 35F, Water Treatment Devices and Hot Water Circulation - Backwater valve
- 1. A building drain valve that keeps public sewer sewage from flowing into the house.
Lesson 34A, Plumbing Scope and Plumbing Terms - 2. A check valve in the drain that lets sewage leave the house and closes against sewage from a blocked public sewer.
Lesson 38E, Sewage Ejectors, Backwater Valves and Sump Pumps - Baffle
- 1. A part at the eaves that holds insulation back from the ventilation openings.
Lesson 15A, Insulation Defects, Water-Resistive Barriers, Radiant Barriers and Fenestration - 2. A cardboard or foam plastic piece at the eaves that keeps insulation out of the ventilation path.
Lesson 16C, Attic Ventilation and Closed Attics - 3. A screw-shaped part inside the flue of most gas water heaters that slows combustion gasses so more heat passes to the water.
Lesson 36B, Electric and Gas Storage Tank Water Heaters - Balanced (HRV or ERV)
- Describes exhaust and supply air flows adjusted to match, usually with dampers in the ducts.
Lesson 16A, Mechanical Ventilation, HRV and ERV, Whole-House Fans - Balcony
- 1. An outdoor platform at or above the second story, on posts or cantilevered.
Lesson 4A, Exterior Scope and Terms, Adhered Masonry Veneer, Metal and Asbestos Cement Siding and Brick Veneer - 2. An outdoor platform at or above the second story, reached by a door from the house.
Lesson 6A, Stoops, Porches and Balconies - Ball faucet
- A faucet with one handle on a rounded body, pushed up for flow and turned side to side for temperature.
Lesson 34D, Faucets, Shower Valves, Hose Bibbs and Aerators - Ball float trap
- One of two traps that may serve as the main vent; the other is the inverted bucket trap.
Lesson 33D, Steam Distribution Components, Vents and Traps - Ball or float
- The part of the fill valve assembly that rises with the tank water and closes the fill valve.
Lesson 35D, Toilets and Bidets - Ball valve
- A full-open valve with a rotating ball, drilled through its center, between two gaskets; it seals well when closed and gives poor flow control.
Lesson 34C, PB, Brass and Lead Pipe, Water Connectors and Valves - Ballast
- 1. Gravel spread over a built-up roof membrane.
Lesson 9A, Low Slope Roofing: Built-Up Membranes and Roll Roofing - 2. A component that delivers the burst of energy a fluorescent bulb needs to start.
Lesson 26B, Switches, Lights and Ceiling Fans - Balloon framing
- 1. A framing system in which stud walls rise from the foundation up to the ceiling joists and upper floors bear on ledger strips.
Lesson 12A, Floor Framing, Spans, Bearing, Notching and Boring - 2. A wall framing system in which the walls go up first and extend to the ceiling joists.
Lesson 12C, Wall Systems, Fireblocking and Fire Separation - Balusters (pickets)
- The vertical fill-in components of a guard.
Lesson 18A, Stairs, Ramps, Handrails and Guards - Band board
- The house framing member at the edge of the floor that a deck ledger is fastened to.
Lesson 6B, Deck Materials, Flashing, Ledger Attachment and Deck Stairs - Banded coupling (elastomeric coupling)
- A connector that secures a pipe joint with stainless steel bands.
Lesson 37A, DWV Rules and Pipe Materials - Barometric damper
- 1. A damper in a jumper duct, identified by a weighted rod, that opens and closes to equalize pressure.
Lesson 29, Air Distribution Systems, Ducts, Returns and Filters - 2. A draft regulator in the vent system of an oil-fired appliance.
Lesson 32C, Oil Burners - 3. A round plate of metal on two hinges in the vent connector that controls draft; also called a draft regulator.
Lesson 32D, Oil Vent Systems - Barrier system (EIFS)
- The EIFS type that relies on every component being installed exactly to the manufacturer's instructions and staying sealed against water.
Lesson 4B, Fiber Cement, Hardboard, Insulbrick, Stucco, EIFS, Vinyl, Wood and Wood Structural Panel Siding - Base (baseboard, base molding)
- Trim along the wall at the floor.
Lesson 17A, Interior Walls, Ceilings, Drywall, Plaster and Trim - Base cabinet
- A cabinet that sits on the floor.
Lesson 18B, Cabinets, Countertops and Smart Home Scope - Base cap
- A small molding along the top of the base.
Lesson 17A, Interior Walls, Ceilings, Drywall, Plaster and Trim - Base flashing
- The component of a two component system installed over the underlayment, with a vertical leg and a horizontal leg.
Lesson 10A, Roof Flashing: Penetrations, Sidewalls and Headwalls - Base membrane
- A modified bitumen sheet laid beneath the cap membrane; a system may have one or more.
Lesson 9B, Low Slope Roofing: Modified Bitumen, Foam and EPDM - Baseboard device
- A distribution device made of a horizontal tube with multiple fins that add surface area; also called a baseboard radiator or baseboard heater.
Lesson 33D, Steam Distribution Components, Vents and Traps - Baseboard device (baseboard heater, baseboard radiator)
- A horizontal tube, usually copper, with fins that draw heat out of the tube by conduction.
Lesson 33B, Hot Water Heating Systems - Baseboard heater (baseboard convector, linear convector)
- The most common distributed electric heater style, installed along the baseboard.
Lesson 33A, Electric Heating Systems - Basement
- An area of a house entirely or partially below grade.
Lesson 11C, Basement Foundations, Materials, Waterproofing and Defects - Basement (cellar)
- A space partly or entirely below grade.
Lesson 11A, Structural Scope and Terms - Basement wall
- A wall that encloses conditioned space and has 50 percent or more of its area below grade.
Lesson 14A, Insulation Scope and Terms, R-Value and How Insulation Works - Batch collector (integral storage)
- A collector that heats and stores water in a black tank inside an insulated box.
Lesson 27B, Alternative Energy Systems: Solar PV, Wind and Solar Water Heating - Bathroom group
- A set of fixtures made up of a sink, a toilet, a bidet, and a bathtub or a shower stall.
Lesson 38C, Vent Systems, Vent Connections and Air Admittance Valves - Bathtub
- A plumbing fixture for personal hygiene by immersion, filled and then drained after every use.
Lesson 35A, Bathtubs - Batt insulation (blanket insulation)
- Insulation sold in rolls and usually installed between framing members.
Lesson 14C, Insulation Materials - Batten
- A wood board, usually 1x2 inch, used to attach and support tiles.
Lesson 8A, Steep Slope Roofing: Asphalt Shingles and Tile - Bay window
- Any window that projects beyond the wall of a building.
Lesson 5B, Windows, Window Flashing, Glazing, Window Wells, Escape Openings and Fall Protection - Beam (girder)
- A member that carries loads passed to it by joists, rafters, and other beams.
Lesson 11A, Structural Scope and Terms - Bed joint
- A horizontal mortar joint in brick or stone veneer.
Lesson 4A, Exterior Scope and Terms, Adhered Masonry Veneer, Metal and Asbestos Cement Siding and Brick Veneer - Bed molding
- 1. Thin, decorative molding at the soffit-to-frieze joint and where interior walls meet ceilings.
Lesson 4A, Exterior Scope and Terms, Adhered Masonry Veneer, Metal and Asbestos Cement Siding and Brick Veneer - 2. Trim that often finishes the joint between the soffit and the house wall.
Lesson 4C, Exterior Trim, Flashing and Sealants, Eaves and Cornice - Bell
- The hub of a clay pipe.
Lesson 37A, DWV Rules and Pipe Materials - Bell trap
- A prohibited trap whose bell-shaped device is fixed to the floor drain cover; very old houses occasionally have one at a floor drain.
Lesson 38A, Traps and Fixture Drains - Bench trial
- A trial decided by a judge, who weighs the facts and applies the law.
Lesson 21A, Business Law, Claims and Liability - Bend
- 1. A drainage fitting that turns the flow, named by degrees or by a fraction of a circle.
Lesson 34A, Plumbing Scope and Plumbing Terms - 2. A fitting that joins two pipes and changes the flow direction; also called an elbow.
Lesson 37B, DWV Fittings, Cleanouts and Defects - Bending radius
- The tightest curve recommended for a tube; for CSST it is typically 3 inches at 3/4 inch and smaller and 5 inches at 1 inch and larger.
Lesson 38F, Gas Pipe Materials: Black Steel, Copper and CSST - Benefit of the bargain damages
- Damages for the loss in property value from alleged defects the plaintiff did not know of when the purchase deal was made.
Lesson 21A, Business Law, Claims and Liability - Benefits
- What satisfies a buyer's need or want.
Lesson 22, Ethics, Starting a Business and Marketing - Beveled bearing plate
- An angled plate that lets the flange of an I-joist rafter bear on wood on a steep slope roof.
Lesson 12B, I-Joists, SCL, Glulam and Floor Trusses - Bidet
- A sink shaped like a toilet bowl, used mainly for cleaning the genital and anal areas.
Lesson 35D, Toilets and Bidets - Bifold door
- A door of two or four leaves that fold back beside the jambs on a track at the header.
Lesson 17B, Interior Doors and Floor Coverings - Bimetallic spring
- A coiled spring in an analog thermostat that moves at a known rate as air temperature changes.
Lesson 28C, Cooling Systems: Condensate, Line Sets and Thermostats - Binder (plaster)
- An additive that helps plaster resist cracking; originally animal hair, now fiberglass.
Lesson 17A, Interior Walls, Ceilings, Drywall, Plaster and Trim - Biofouling
- A bacterial film on well equipment; it can block water flow and give the water an unpleasant taste.
Lesson 35H, Cisterns, Water Quality and Fire Sprinklers - Biomass
- A solid fuel such as corn cobs.
Lesson 33E, Steam Boiler Components, Solid Fuel and Related Components - Bird's-mouth cut
- The name sometimes given to the seat cut notch of a rafter whose tail runs past the wall.
Lesson 13A, Roof and Ceiling Framing, Rafters, Ties and Purlins - Bitumen
- Asphalt or coal tar.
Lesson 9A, Low Slope Roofing: Built-Up Membranes and Roll Roofing - Bituminous coating
- A tar-like substance applied to a concrete or masonry foundation wall.
Lesson 11C, Basement Foundations, Materials, Waterproofing and Defects - Black board
- An asphalt-based sheet product used as wall sheathing on older houses.
Lesson 12D, Wood Wall Framing, Bracing and Wall Defects - Black steel gas pipe
- Rigid gas pipe usually sold in 10 foot sections; its color and form may identify it.
Lesson 38F, Gas Pipe Materials: Black Steel, Copper and CSST - Black steel pipe
- Steel pipe like galvanized steel pipe but without the zinc coating, still common for gas distribution.
Lesson 34B, Pipe Supports, Copper, CPVC, Galvanized Steel and PEX - Blast tube
- The tube of an oil burner where oil and air mix; it holds the spinning disk and the cadmium cell.
Lesson 32C, Oil Burners - Blocking
- Horizontal wood pieces fastened between studs to reinforce a cut, notched, or damaged stud.
Lesson 12D, Wood Wall Framing, Bracing and Wall Defects - Blocking (lateral restraint)
- Attachment of floor joists to a rim joist of full depth so that they cannot twist.
Lesson 12A, Floor Framing, Spans, Bearing, Notching and Boring - Blowing agent
- An ingredient mixed into spray foam that controls how much the foam expands.
Lesson 14C, Insulation Materials - Board and batten
- Vertical wood plank siding with wood strips over the vertical joints.
Lesson 4B, Fiber Cement, Hardboard, Insulbrick, Stucco, EIFS, Vinyl, Wood and Wood Structural Panel Siding - Bollard
- 1. A vehicle stop that protects an appliance in a garage from vehicle impact.
Lesson 31A, Gas Appliance Categories and Gas Forced-Air Furnaces - 2. A steel post that protects an appliance in a garage from vehicle impact.
Lesson 36D, Water Heater Installation, Seismic Bracing, Thermal Expansion and Defects - Bond
- A third party's promise to pay a judgment the bonded home inspector does not pay; not insurance.
Lesson 21B, Contracts and Insurance - Bond beam
- A concrete beam that gives a modern rammed earth wall lateral support.
Lesson 12E, CMU, Brick, ICF, SIPs and Uncommon Wall Materials - Bonding
- 1. Joining metal parts not meant to carry current, physically and electrically, so a ground fault has a low resistance path to the breaker or fuse.
Lesson 23A, Electrical Terms and Basic Electricity - 2. Joining metal that is able to carry electricity, but should not, into one permanent, low resistance path back to the source.
Lesson 23B, Grounding, Bonding and the Electrical Service - Bonding jumper
- A conductor installed around an interruption in bonded metal, such as a water meter or a plastic box.
Lesson 23B, Grounding, Bonding and the Electrical Service - Boot (HVAC distribution system)
- A rectangular or round sheet metal fitting that joins a grille or register to an air duct.
Lesson 28A, Cooling Systems: Understanding the System - Boot (roof jack, thimble)
- Flashing that closes a roof penetration such as a plumbing vent or an appliance vent.
Lesson 10A, Roof Flashing: Penetrations, Sidewalls and Headwalls - Bootleg ground
- 1. A receptacle whose grounding terminal is connected to its neutral terminal; a three-light tester gives an inaccurate result at it.
Lesson 20, Inspection Tools and the Inspection Process - 2. A wire joining the EGC terminal to the neutral terminal of a receptacle, which a 3-light tester reads as grounded; a potential shock hazard.
Lesson 26A, Receptacles - Bottle trap
- A P-trap variation; approved in some jurisdictions and not specifically prohibited.
Lesson 38A, Traps and Fixture Drains - Bottom chord bearing
- 1. The usual floor truss support, in which the bottom chord rests on the wall or the sill plate.
Lesson 12B, I-Joists, SCL, Glulam and Floor Trusses - 2. A roof truss arrangement in which the bottom chord rests on top of the wall; the usual arrangement.
Lesson 13B, Roof Framing Defects, Trusses and Attic Access - Bottom rail
- 1. The horizontal sash member at the sill.
Lesson 5B, Windows, Window Flashing, Glazing, Window Wells, Escape Openings and Fall Protection - 2. The lowest component of a guard, where one is used.
Lesson 18A, Stairs, Ramps, Handrails and Guards - Bow (bowed)
- Describes a member curved along its long axis.
Lesson 11A, Structural Scope and Terms - Bow (compass) window
- A semicircular bay window.
Lesson 5B, Windows, Window Flashing, Glazing, Window Wells, Escape Openings and Fall Protection - Boxed column
- 1. A wood post, steel post, or dimension lumber surrounded by trim lumber.
Lesson 6A, Stoops, Porches and Balconies - 2. A deck post made of a wood post, dimensional lumber, or a steel post wrapped in trim lumber.
Lesson 6B, Deck Materials, Flashing, Ledger Attachment and Deck Stairs - Boxed cornice (boxed eaves, closed eaves)
- Eaves with the rafters enclosed by trim such as fascia and soffit.
Lesson 4C, Exterior Trim, Flashing and Sealants, Eaves and Cornice - Braced wall
- A wall with two or more wall braces to resist racking.
Lesson 12D, Wood Wall Framing, Bracing and Wall Defects - Branch circuit
- The conductors from one circuit breaker or fuse to the outlets it serves.
Lesson 23A, Electrical Terms and Basic Electricity - Branch circuit, multiwire
- A circuit in which one neutral serves two energized conductors.
Lesson 23A, Electrical Terms and Basic Electricity - Branch circuit/feeder AFCI
- The first AFCI type, which detects parallel faults only; barred from new installations since the late 2000s.
Lesson 24B, Overcurrent Protection, GFCI and AFCI - Branch drain (fixture branch)
- A drainage pipe fed by other branch drains or by at least two fixture drains.
Lesson 34A, Plumbing Scope and Plumbing Terms - Branch vent
- 1. A vent pipe tying two or more individual vents into a stack vent or vent stack.
Lesson 34A, Plumbing Scope and Plumbing Terms - 2. A vent sized on the drainage flow of every pipe it serves.
Lesson 38B, Plumbing Vents: Purpose, Inspection, Terminals and Size - 3. A vent that gathers other vents and carries them to a vent stack.
Lesson 38C, Vent Systems, Vent Connections and Air Admittance Valves - Brass
- An alloy of zinc and copper, more golden in tone than copper.
Lesson 34C, PB, Brass and Lead Pipe, Water Connectors and Valves - Brazed joint
- A joint made by fusing metal pipe and fittings with a mostly silver alloy above 800 degrees F; it is stronger than a soldered joint.
Lesson 38F, Gas Pipe Materials: Black Steel, Copper and CSST - Brazing (silver soldering)
- Fusing metal pipe and fittings with a mostly silver alloy above 800 degrees F.
Lesson 34A, Plumbing Scope and Plumbing Terms - Breach of contract
- A party's failure to perform the promises in a contract.
Lesson 21A, Business Law, Claims and Liability - Brick molding
- A style of casing around doors and windows, and an example of functional trim.
Lesson 4C, Exterior Trim, Flashing and Sealants, Eaves and Cornice - Brick veneer chimney
- A framed chase with a brick wall covering, which is not a masonry chimney.
Lesson 40A, Factory-Built Fireplaces and Chimneys - Bridging
- 1. Solid lumber or X pieces installed near midspan between floor joists to help prevent twisting.
Lesson 12A, Floor Framing, Spans, Bearing, Notching and Boring - 2. Members fastened across ceiling joists or rafters to keep them from twisting; also called lateral support.
Lesson 13A, Roof and Ceiling Framing, Rafters, Ties and Purlins - Brief
- A party's written case summary, given to the clerk in small claims court.
Lesson 21A, Business Law, Claims and Liability - Brine (salt) tank
- The softener tank holding the salt water that supplies the sodium.
Lesson 35F, Water Treatment Devices and Hot Water Circulation - British thermal unit (Btu)
- The heat that warms 1 pound of water 1 degree F; a common measure of air conditioner capacity.
Lesson 28A, Cooling Systems: Understanding the System - Brown coat
- The second of the three plaster coats.
Lesson 17A, Interior Walls, Ceilings, Drywall, Plaster and Trim - Bubble cover
- A receptacle cover that stays weatherproof while a plug is inserted, used in wet areas.
Lesson 26A, Receptacles - Bubbler
- A device at the end of an underground drain with too little slope for an open air termination, which opens above ground to release water and closes when the flow stops.
Lesson 2B, Grade, Drainage and Vegetation - Bucks (back jambs)
- Wood members around a garage door opening where the door, torsion spring, and door operator attach.
Lesson 7, Garage Vehicle Doors and Operators - Building drain
- The drainage pipe that is usually lowest in a house; it ends 30 inches outside the exterior wall.
Lesson 34A, Plumbing Scope and Plumbing Terms - Building subdrain
- The drain that carries waste from basement fixtures to a sewage ejector sump.
Lesson 38E, Sewage Ejectors, Backwater Valves and Sump Pumps - Building thermal envelope
- The conditioned, meaning heated and cooled, part of a building, separated by its boundary from unconditioned space.
Lesson 14A, Insulation Scope and Terms, R-Value and How Insulation Works - Building trap (house trap)
- A trap in the building drain near its connection to the building sewer.
Lesson 38A, Traps and Fixture Drains - Built-in
- A sink style formed from the countertop material, as one piece with the countertop.
Lesson 35C, Sinks - Built-up roof membrane (BUR)
- A low slope covering made of at least two layers of felt or other membrane, each coated with bitumen or a cold-applied adhesive.
Lesson 9A, Low Slope Roofing: Built-Up Membranes and Roll Roofing - Bulkhead door
- 1. An inclined or horizontal door leading to a cellar or other storage area, or under the house.
Lesson 4A, Exterior Scope and Terms, Adhered Masonry Veneer, Metal and Asbestos Cement Siding and Brick Veneer - 2. A door, horizontal or inclined, leading to a space beneath the home or to storage such as a cellar.
Lesson 5A, Exterior Doors and Safety Glazing at Doors - Burner
- The part that burns gas inside the combustion chamber below the tank.
Lesson 36B, Electric and Gas Storage Tank Water Heaters - Bursting
- A sewer repair method that breaks the existing pipe apart and pulls a replacement in behind it.
Lesson 37A, DWV Rules and Pipe Materials - Bus (buss, busbar)
- The heavy metal part of a panelboard that breakers or fuses mount on.
Lesson 23A, Electrical Terms and Basic Electricity - Business license
- A government's permission to do business in its jurisdiction; also called a privilege license.
Lesson 22, Ethics, Starting a Business and Marketing - Business use endorsement
- An addition to a personal vehicle policy for losses that occur during business use.
Lesson 21B, Contracts and Insurance - Butt
- The thick end of a wood shingle or shake.
Lesson 8C, Steep Slope Roofing: Slate, Polymer, Wood and Ice Dams - Butterfly valve
- A valve with a metal plate in a gasket, moved by a handle; it gives good flow control and is not full-open.
Lesson 34C, PB, Brass and Lead Pipe, Water Connectors and Valves - Buttress
- A wall repair of one or more walls set at right angles to the problem wall.
Lesson 11D, Foundation Repairs, Crawl Spaces and Slabs - Buttresses and shoring
- Vertical posts on the outside of a retaining wall that secure it.
Lesson 2A, Site Scope, Terms and Retaining Walls - Bypass duct
- A duct on some humidifiers that connects to the other plenum, the one without the humidifier.
Lesson 33E, Steam Boiler Components, Solid Fuel and Related Components - Bypass valve
- A valve that removes a softener from the water supply system.
Lesson 35F, Water Treatment Devices and Hot Water Circulation
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