Acclimation
The period when flooring is left in the room where it will be installed so it can adjust to the temperature and humidity. Skipping it can cause gaps or buckling after installation.
Reference
Flooring glossary
The words contractors use, explained in plain English — so you can follow the conversation and spot the difference between a real scope and a vague promise.
Flooring has its own vocabulary, and most of it is not complicated once it is translated. A quote might mention acclimation, a vapor barrier, floor flatness and a transition strip in the same paragraph. None of those words is technical for its own sake; each one describes something that affects how the finished floor looks and how long it lasts.
The definitions below are written for a homeowner, not for a installer. Where a term has a different meaning in a different product system, the definition says so. If a contractor uses a word that is not here, ask them to explain it — a good one will, without making you feel foolish.
A
Adhesive
The glue used to bond flooring to a subfloor. Different products are formulated for wood, concrete, vinyl and engineered planks, and using the wrong one can void a warranty.
Allowance
A budget figure in a quote that covers material not yet chosen, usually expressed per square foot. If you select a product above the allowance, you pay the difference.
- Also called
- Material allowance
B
Baseboard
The trim board running along the bottom of a wall. It hides the expansion gap at the edge of a floor and usually has to be removed and reinstalled during installation.
Bevel
A small angled edge on a plank that creates a groove between boards. Bevels hide minor height differences and give a floor a more defined, plank-by-plank look.
Buckling
When flooring lifts or peaks away from the subfloor, usually because the planks were installed too tight against a wall or the floor absorbed moisture without room to expand.
C
Caulk
A flexible sealant used at joints where flooring meets a tub, shower, exterior door or other fixed object. It fills the gap while allowing slight movement.
Crowning
A condition where the center of a wood plank rises higher than its edges, often after moisture exposure. It is the opposite of cupping and may require sanding or replacement.
Cupping
When the edges of a wood plank curl upward and the center sits lower, giving the floor a washboard feel. It usually signals moisture imbalance from below or above.
D
Damp-proof membrane
A sheet or liquid coating laid over a concrete slab to slow moisture vapor from reaching the flooring above. It is different from a vapor barrier under a wood subfloor.
Delamination
Separation of the layers within an engineered or laminate plank, or of the flooring from its backing. It often appears as peeling edges or a hollow sound underfoot.
E
Engineered hardwood
Real wood flooring made from a plywood core topped with a thin layer of hardwood. It is more dimensionally stable than solid wood and can be installed over concrete.
Expansion gap
A small gap left between the flooring and the wall, hidden by trim, so the floor can expand and contract with humidity. Without it, planks can buckle.
F
Floating floor
A floor installed over an underlayment without being glued or nailed to the subfloor. The planks lock together and the whole surface moves as one unit.
Floor flatness
How level a subfloor is across a given distance, measured against a straightedge or a manufacturer's tolerance. Flatness matters more than being perfectly level.
G
Glue-down
An installation method where flooring is bonded to the subfloor with adhesive. It is common for engineered wood, vinyl plank and tile, and it feels firmer underfoot than a floating floor.
H
Herringbone
A pattern where rectangular planks are laid at right angles to each other in a zigzag. It uses more material and takes longer to install than a straight lay.
L
Laminate
A synthetic floor made from a fiberboard core with a printed image and a clear wear layer. It is not wood, though it is often printed to look like it.
Leveling compound
A pourable cement-based or gypsum-based mix used to fill low spots and flatten a subfloor before flooring goes down. Also called self-leveling underlayment.
Luxury vinyl plank
A vinyl floor made to resemble wood planks, usually with a rigid core and a printed wear layer. It is water-resistant and common in kitchens and basements.
- Also called
- LVP, LVT
M
Moisture barrier
A material that stops moisture vapor from moving between a slab or crawlspace and the flooring. Its placement and permeability depend on the flooring product.
Molding
Trim used to finish edges and transitions, including baseboard, shoe molding, quarter round and stair nosing. Often listed separately from the flooring in a quote.
N
Nosing
The rounded or squared edge of a stair tread that overhangs the riser. Stair nosings are usually priced per step because they are cut and fitted individually.
P
Parquet
Flooring made from small wood pieces arranged in a geometric pattern, often squares or herringbone. Older parquet is usually glued down and can be sanded and refinished.
Plank
A single board of flooring, typically longer than it is wide. Plank width affects the look of a room and the amount of material needed for cuts.
Plywood subfloor
The structural wood panels nailed or screwed over joists to form the base for finished flooring. Its thickness and condition determine how solid the finished floor feels.
Q
Quarter round
A small curved trim piece installed at the junction of baseboard and floor to cover the expansion gap. It is thinner than shoe molding and shows more of the floor edge.
R
Radiant heat
A heating system built into the floor, either as electric mats or hydronic tubes. Not every flooring product is approved for use over it, and the maximum surface temperature matters.
Refinishing
Sanding the top layer of a solid or engineered wood floor and applying a new finish. Solid wood can usually be refinished several times; thin engineered veneers may not be refinishable at all.
S
Shoe molding
A narrow trim piece fixed to the baseboard to cover the expansion gap. It is thinner and more decorative than quarter round and is easier to remove for future floor work.
Stair nosing
The finished edge piece on a stair tread, matching the flooring and providing a safe, visible edge. It is a separate line item in most quotes.
Subfloor
The structural surface beneath the finished floor, usually plywood, OSB or a concrete slab. Preparation of the subfloor is the most important step in a lasting installation.
T
Tack strip
A narrow strip of wood with upward-facing pins nailed around the perimeter of a room to grip stretched carpet. It is removed when carpet is replaced with hard flooring.
Transition strip
A trim piece that covers the joint where two flooring types or heights meet, such as wood to tile or a room to a hallway. Often omitted from a quote until asked about.
U
Underlayment
A layer between the subfloor and the finished floor that provides cushioning, sound reduction or moisture protection. It is not the same as the structural subfloor.
W
Wear layer
The top, protective layer of a flooring product, measured in mils or millimeters. A thicker wear layer resists scratches and determines whether the floor can be refinished.
Wood filler
A compound used to fill gaps, nail holes and small defects before finishing. It can shrink or crack as the floor moves, so it is a cosmetic fix rather than a structural one.
Keep reading
The hiring guide puts these terms to work in a seven-step process. The quote guide shows which of them should appear as a line item, and the question list gives you the wording to ask about them.
Use the vocabulary
Ask better questions with the words you just learned
A short, specific question — “did you test the slab for moisture, and where are the readings?” — is harder to brush past than a general one.