Contractors throw around terms like cupping, crowning, and wear layer as if everyone knows them. Here's a clear, practical glossary so you actually do.
Parquet terminology gets thrown around inconsistently across contractors, blogs, and product listings — "crown-boarding," "wear layer," "cupping" and "crowning" all sound similar but mean genuinely different things. Not knowing the difference makes it hard to understand a quote or a diagnosis.
Here's a clear, practical reference so you can follow any conversation about your floor with confidence.
Solid parquet: blocks made of timber all the way through. Engineered parquet: a thin real-wood veneer bonded onto a plywood or composite core. Wear layer: the usable thickness of solid wood above the tongue-and-groove joint (solid) or the veneer thickness (engineered) — this determines how many times a floor can be sanded.
Tongue-and-groove: the interlocking joint system connecting individual boards or blocks. Screed: the cement-based levelling layer between the concrete slab and the flooring above it.
Cupping: boards forming a shallow dome, edges higher than the centre — usually from moisture reaching the underside more than the top. Crowning: the opposite — centre higher than edges, often from sanding a floor that was still damp. Buckling: boards visibly lifting off the subfloor, a sign of severe, sustained moisture exposure.
Crown-boarding: a term some contractors use interchangeably with crowning or general board distortion from moisture. Blistering: bubbling in the surface, which can be caused by either water damage or, less commonly, termite activity underneath.
| Term | What It Means |
|---|---|
| Wear layer | Usable sandable thickness before the floor can't be refinished |
| Cupping | Board edges higher than centre – moisture-related |
| Crowning | Board centre higher than edges – often from sanding while damp |
| Buckling | Boards lifting off subfloor – severe moisture, needs urgent attention |
| Blistering | Surface bubbling – water or possible termite activity |
| Screed | Levelling layer beneath the flooring |
| Tongue-and-groove | Interlocking joint connecting boards |
Illustrative urgency guide — when in doubt about any term used in a quote or inspection, ask the contractor to explain it in plain terms.
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