Carpet Tile — Pile, Backing and Acoustic Value

What it is

Modular textile floor tiles, typically 500 × 500mm, laid loose or with tackifier on a prepared subfloor or a raised access floor.

Specification at a glance

Property	Typical specification
Pile fibre	Nylon 6 or 6,6; solution dyed preferred
Pile weight	500 — 1,000+ g/m² — state it
Construction	Loop, cut pile, or cut and loop
Backing	Bitumen, PVC, or cushion
Use class	EN 1307 / EN ISO 10874 class stated
Fire class	Named EN 13501-1 class

What actually determines how it looks in three years

Pile weight and fibre. Solution-dyed nylon holds colour and resists cleaning chemicals far better than piece-dyed alternatives.

Construction. Loop pile resists crushing in traffic lanes better than cut pile, which is why corridors and lobbies are usually loop.

Backing. A dimensionally stable backing keeps tiles tight at the joints; a poor one lets tiles shrink and open gaps that collect dirt.

Laying pattern. Quarter-turn, monolithic or ashlar — each hides or reveals shading differently, and the pattern must be specified because it cannot be changed later.

Where projects go wrong

• Pile weight unspecified and a light grade laid in heavy traffic.
• Batch mixing. Tiles from different production batches shade visibly under office lighting; batch numbers must match across a floor plate.
• Laid on a damp or dusty subfloor, so the tackifier never grips.
• No attic stock retained. Matching tiles years later is usually impossible.
• Wrong laying direction, which shows as banding once the furniture is out and the light rakes across the floor.

Standards referenced

Pile carpet classification under EN 1307. Floor covering use classes under EN ISO 10874. Reaction-to-fire classification to EN 13501-1.