How to count stone, zellige and parquet: pieces, packs and consumables

1. Stone and zellige: pieces with joints

A piece takes its own size plus one joint on each axis. Divide the area, increased by the waste, by that area and round up. Adhesive and grout are counted per square metre at the maker’s rate.

2. Parquet: boards, packs, underlay, skirting

Divide the area with waste by the area of a board for the boards, and by the coverage of a pack for the packs. The underlay covers the area plus its overlaps. The skirting is the perimeter divided by the length of a bar.

Worked example: 30 m² of stone 60 × 40 cm, 3 mm joints

Waste 10 %, adhesive 5 kg/m², grout 0.6 kg/m²:

• Piece with joints 0.603 × 0.403 = 0.243009 m².
• Area with waste 30 × 1.10 = 33.00 m². Pieces: 33 / 0.243009 = 135.8, so 136.
• Adhesive 30 × 5 = 150.00 kg. Grout 30 × 0.6 = 18.00 kg.

Zellige and parquet

6 m² of 10 cm zellige with 2 mm joints and 10 % waste, then 25 m² of parquet in boards of 14 × 120 cm, packs of 2.2 m², 20 m of perimeter:

• Zellige: piece 0.102² = 0.010404 m², 6 × 1.10 / 0.010404 = 634.4, so 635 pieces.
• Parquet: area with waste 27.50 m²; boards 27.5 / 0.168 = 163.7, so 164; packs 27.5 / 2.2 = 12.5, so 13.
• Underlay 25 × 1.05 = 26.25 m². Skirting 20 / 2.4 = 8.33, so 9 bars.

What this does not cover

The count does not check the substrate, the flatness, the expansion gaps or the load of a stone floor. These come from the maker and the installer.