Why does terminology matter when hiring a contractor?
Because the terms that distinguish a good quote from a vague one are exactly the ones most homeowners have never encountered. Finish level, texture type, and board specification are the three things that most change what you pay and what you get.
The full glossary below defines every term you are likely to encounter on an estimate or a jobsite.
Drywall terms A to Z
- Abuse-Resistant Drywall
- Board with a denser core and tougher facing that resists surface scuffing, scraping, and shallow indentation. Used in corridors, rental units, schools, and other high traffic areas.Abuse-Resistant Drywall
- Access Panel
- A removable panel installed in a finished wall or ceiling to provide service access to valves, cleanouts, or equipment concealed behind the surface.Access Panel Finishing
- Acoustic Drywall Assembly
- A complete wall or ceiling system engineered to reduce sound transmission, combining decoupled framing, cavity insulation, added mass, and comprehensive sealing.Acoustic Drywall Assemblies
- Blocking
- Extra framing installed between studs to provide a solid fastening point behind finished drywall for televisions, cabinets, grab bars, handrails, and equipment.Blocking and Backing
- Butt Joint
- A joint where two non tapered drywall edges meet. Butt joints are harder to finish invisibly than tapered edge joints because there is no recess for the compound, so good sheet layout minimizes them.
- Callback
- A return visit to correct work that did not meet the expected standard. Callback rate is one of the more honest quality measures for a drywall contractor.
- Cement Board
- A tile backer made from cement and reinforcing fibres rather than gypsum. Water durable rather than waterproof, and the correct substrate behind tile in showers and wet areas.Cement Board Installation
- Containment
- Physical barriers, usually plastic sheeting with sealed doorways, that isolate a work area so dust and debris do not spread through the rest of the building.Containment and HEPA Sanding
- Control Joint
- A deliberate break in a drywall surface that allows the assembly either side to expand and contract independently without cracking the finish. Used on long wall runs and large ceilings.Crack Repair
- Corner Bead
- A metal, vinyl, or paper faced angle installed at outside corners to create a straight edge and protect it from impact. Available in metal for durability and vinyl for moisture resistance.
- Critical Lighting
- Light that travels nearly parallel to a surface rather than striking it directly, produced by large windows, skylights, and wall washing fixtures. It casts shadows off very small surface variations, which is why it demands a Level 5 finish.Level 5 Critical Light Finish
- CSLB
- The California Contractors State License Board, the state agency that licenses and regulates construction contractors in California.
- Decoupling
- Separating drywall from framing using resilient channel or isolation clips so vibration cannot travel structurally from one side of a wall to the other. Typically the single most effective soundproofing measure.Resilient Channel Installation
- Drywall
- Interior wall and ceiling board made from a gypsum core faced with paper or fiberglass, finished with joint compound and then painted or textured. Also called gypsum board, wallboard, or sheetrock.Drywall Installation
- Dustless Sanding
- Sanding using tools connected to HEPA filtered vacuum extraction, capturing gypsum dust at the sanding head as it is created. It captures the large majority of dust rather than literally all of it.Dustless Drywall Sanding
- Feathering
- Tapering joint compound progressively thinner toward its edges so the transition from compound to board is imperceptible. Insufficient feathering leaves a visible ridge or halo.
- Firestopping
- Approved materials and systems installed where pipes, conduit, and ducts penetrate a fire rated assembly, sealing the opening so fire and smoke cannot pass through. Unsealed penetrations are the most common cause of rated assembly failure.Fire-Resistant Drywall
- Green Board
- The common name for moisture resistant drywall, from its traditional green facing. Suitable for humid environments but not for direct water contact.Moisture-Resistant Drywall
- Joint Compound
- The material used to cover fasteners, embed tape, and finish drywall joints. Commonly called mud. Available in setting type, which cures chemically, and ready mix, which dries by evaporation.
- Knockdown Texture
- A texture sprayed heavier than orange peel and then flattened with a wide knife once it has begun to set, producing a mottled pattern of small plateaus. Very common on Orange County ceilings.Knockdown Texture
- Level 4 Finish
- Tape plus three coats of compound over joints, fasteners, and beads, sanded smooth, with the board paper left exposed between them. The standard specification for textured walls and flat to eggshell paint.Level 4 Finish
- Level 5 Finish
- A Level 4 finish plus a thin skim coat of compound over the entire surface, giving the whole wall uniform texture and porosity. Required for smooth walls, critical lighting, and paint sheens above eggshell.Level 5 Finish
- Mud
- Jobsite shorthand for joint compound.
- Nail Pop
- A fastener that has backed out of the framing as lumber dried and shrank, pushing a visible bump or crescent crack through the finished surface. Repairing it requires resetting the fastener, not just filling the bump.Nail Pop Repair
- NAP
- Name, Address, Phone. The core business information that must be consistent across a website, Google Business Profile, and every directory listing for local search purposes.
- Orange Peel Texture
- A light spray texture producing a finely stippled surface resembling citrus skin. Sprayed and left untouched. The most common residential wall texture in Southern California.Orange Peel Texture
- Paint Ready
- A surface at its specified finish level, sanded uniform with no ridges or gouges, and completely free of dust so primer will bond and absorb evenly. It does not mean primed.Paint Ready Finishing
- Popcorn Ceiling
- A sprayed acoustic ceiling texture applied widely from the 1950s through the early 1980s. Texture from that era may contain asbestos and should be laboratory tested before removal.Popcorn Ceiling Removal
- Punch List
- The final list of remaining items to complete or correct before a project is accepted as finished.
- Raking Light
- A light held nearly parallel to a surface and swept along it, used to reveal ridges, dips, and texture variation that normal room lighting hides. The standard quality inspection method for finished drywall.
- Resilient Channel
- A thin flexible metal profile installed between framing and drywall to decouple the two and interrupt the structural path sound travels. Easily rendered ineffective by fasteners that reach the stud behind it.Resilient Channel Installation
- Scope of Work
- The written description of exactly what a project includes and excludes. On a drywall project it should always state the finish level and whether texture matching is included.
- Shaft Wall
- A fire rated assembly enclosing elevator shafts, stairwells, and mechanical chases, designed to be installed entirely from one side using liner panels set into slotted studs.Shaft Wall Systems
- Skim Coat
- A thin layer of joint compound applied across an entire surface to create a smooth uniform plane. Used to achieve Level 5, to remove existing texture, and to resurface damaged walls.Skim Coating
- Skip Trowel Texture
- A hand applied texture created by dragging a loaded trowel at a low angle so it skips across the surface, leaving irregular flattened areas. The hardest common texture to match on a repair.Skip Trowel Texture
- STC
- Sound Transmission Class, a single number rating of how well an assembly reduces airborne sound. Higher is better. Real world performance depends heavily on installation quality and flanking paths.Soundproof Drywall
- Tape and Bed
- The process of embedding reinforcing tape into a wet bed of joint compound at a drywall seam. The tape provides the tensile strength that stops the joint cracking as the building moves.Joint Taping and Mudding
- Tenant Improvement
- Interior construction work performed to fit out or reconfigure a commercial space for a tenant. Usually abbreviated to TI.Tenant Improvement Drywall
- Texture Matching
- Replicating an existing wall or ceiling texture so a repair blends invisibly. Requires physical sampling and adjustment rather than estimation.Custom Texture Matching
- Truss Uplift
- Seasonal movement where roof trusses lift slightly at the centre as humidity changes, opening a crack along the line where the ceiling meets the wall. Cosmetic rather than structural in almost all cases.Ceiling Repair
- Type X Drywall
- 5/8 inch gypsum board with glass fibre reinforcement in its core that helps it stay intact longer under fire exposure. A component of most one hour rated assemblies, though the rating belongs to the assembly rather than the board.Type X Drywall
- Walkthrough
- A final review of completed work with the client before a project is closed out, giving both parties a chance to identify anything outstanding.