Overview
ISO 4562:2023 - Wood parquet strips - Classification - establishes international quality classification for non‑assembled solid parquet strips of eight wood species: oak (Quercus sp.), hickory (Carya sp.), beech (Fagus sylvatica), birch (Betula sp.), maple (Acer sp.), fir (Abies sp.), spruce (Picea sp.) and maritime pine (Pinus pinaster). Published in 2023, this first edition merges earlier national standards and provides a single reference for grading appearance and allowable defects in solid parquet strips.
Key topics and technical requirements
- Scope and species: Applies only to non‑assembled solid parquet strips of the eight listed species.
- Manufacture & delivery: Manufacture, characteristics and delivery conditions are referenced to ISO 1072. Minimum dimensions and mean lengths for unspecified lengths are agreed between buyer and seller.
- Moisture content: Delivery moisture content shall be between 6 % and 13 %, unless local requirements or contractual terms are more restrictive.
- Pre‑treatment: Beech strips are steamed before delivery unless otherwise requested. Fir, spruce and maritime pine may be insect‑treated where appropriate.
- Grade classification: Strips are divided into quality grades (denoted in the standard as *****, **, *). Each grade defines permitted defects and limits for:
- knots, knot clusters and knot sizes
- shakes, checks and splits (depth/length limits)
- pith traces and medullary sheaths
- sapwood, redheart and colouring/stains
- planing imperfections, planing wave limits and tolerances (expressed as maximum depths and % of length or width)
- wane (dull edges), bark pockets, frost cracks and wormholes
- Tables: Detailed numeric allowances and limits are provided in Tables 1–9, covering general characteristics and specific face/back/edge allowances per species and grade.
- Notes: Appearance grading is inherently subjective; totally defect‑free strips are not covered; beech quarter‑cut and half‑quarter cut strips are excluded.
Applications and users
ISO 4562:2023 is used across the parquet supply chain:
- Manufacturers and mill planners - for production tolerances, grading and labeling
- Quality controllers and inspectors - for acceptance criteria at delivery
- Buyers, traders and importers/exporters - to specify contract quality and avoid disputes
- Architects, specifiers and flooring contractors - to select appropriate grade for visual and performance requirements
- Standards bodies and testing laboratories - for harmonized classification in procurement and certification
Keywords: ISO 4562:2023, wood parquet strips classification, solid parquet strips, parquet flooring standards, moisture content, grade classification, oak hickory beech birch maple fir spruce maritime pine.
Related standards
- ISO 1072 - Solid wood parquet - General characteristics
- ISO 5323, ISO 24294 - Vocabulary for wood and timber
- Referenced historic standards merged into this edition (see bibliography in ISO 4562:2023).