# Carpet Tile — Pile, Backing and Acoustic Value

> Carpet tiles are modular textile floor tiles, typically 500 x 500mm, laid loose or with tackifier on a prepared subfloor or raised access floor. Offices use them because single tiles lift for access and replace individually; pile weight, fibre and construction decide how well they wear in traffic.

## 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**.

## Frequently asked questions

### What pile weight is right for a commercial office?

Pile weight in grams per square metre is the main durability indicator. Roughly 500 g/m² suits light office use, 700 to 800 g/m² general commercial floors, and 900 g/m² and above heavy traffic such as corridors, receptions and lift lobbies. Quoting only a product name and colour without the pile weight and use class is how projects end up with carpet that mats and shades within a year in the wrong areas.

### Why carpet tiles rather than broadloom in offices?

Because offices change. Individual tiles lift for access to floor boxes and underfloor services, damaged or stained tiles are replaced singly rather than re-carpeting a room, and spare stock from the original batch can be held for years. On a raised access floor the tile module also aligns with the floor panel grid, so lifting a panel means lifting one tile.

### Do carpet tiles help acoustics?

They reduce impact noise — footfall transmitted to the space below — noticeably, and they absorb a modest amount of airborne sound in the room. They are not a substitute for ceiling absorption or acoustic partitions where speech privacy is required. In an open-plan office they are one part of a strategy that also needs ceiling and wall treatment to work.

## Sources

- [EN 1307](https://standards.cencenelec.eu/ords/f?p=CEN:105) — Textile floor coverings — classification of pile carpets
- [EN ISO 10874](https://www.iso.org/standards.html) — Resilient and textile floor coverings — classification
- [EN 13501-1](https://standards.cencenelec.eu/ords/f?p=CEN:105) — Reaction to fire classification

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Source: https://hagerstone.com/materials/carpet-tile