Tile & Grout Details
Standard: 2-5mm
At least 2/3 tile thickness
10% recommended
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UKUK Building Regulations
References & Sources
Standards Cited
- BS 5385-3 — Wall and Floor Tiling — Code of Practice for the Design and Installation of Ceramic and Mosaic Tiling
Defines grout joint widths and application standards for UK tile installations - BS EN 13888 — Grout for Tiles — Definitions, Requirements, Evaluation of Conformity
Classifies grout types (CG1, CG2, RG) and performance requirements
Formulas Used
- Grout line length per m²:
groutLength = (tileLength + tileWidth) / (tileLength × tileWidth)
Source: Tile geometry — All dimensions in metres. Accounts for shared grout lines between adjacent tiles. - Grout volume per m²:
groutVolume = groutLineLengthPerM2 × groutWidth × groutDepth
Source: BS 5385-3 / TCNA Handbook - Grout weight:
groutKg = groutVolumeLitres × coverageKgPerLitre
Source: Manufacturer coverage rates
Key Assumptions
- Grout density approximately 1.6 kg per litre (unsanded) — Manufacturer data (Mapei, BAL, Weber)
- Standard grout joint width 2-3mm for wall tiles, 3-5mm for floor tiles — BS 5385-3