Roof Tile, Batten & Membrane Estimator
Estimate quantities and approximate material costs with wastage allowances
m²
%
Required Tiles880 units
Total Battens273 m
Membrane2 rolls
Material Coverage Rules: Large format interlocking concrete tiles (e.g. Marley Mendip/Modern) require approximately 10.0 tiles/m². Natural slates (500×250mm) require approximately 19.5 slates/m², and double-lap plain tiles require approximately 60.0 tiles/m². Always add 10% for hip/valley cutting and transport breakage.
Typical UK Material Quantities & Batten Gauges
| Roof Covering | Coverage (per m²) | Batten Gauge | Linear Battens (per m²) | Min. Pitch (BS 5534) |
|---|---|---|---|---|
| Interlocking Concrete Tiles | 9.5 – 10.5 units | 310mm – 345mm | 3.1 – 3.3 metres | 15° – 17.5° |
| Double-Lap Plain Tiles | 60.0 units | 100mm | 10.0 metres | 35.0° |
| Natural Slate (500×250mm) | 19.0 – 20.5 units | 200mm – 212mm | 4.8 – 5.0 metres | 20.0° |
| Fibre Cement (600×300mm) | 13.4 units | 250mm | 3.8 metres | 15.0° |
📚 Primary Technical Sources & British Standards
- BS 5534:2014+A2:2018: Code of practice for slating and tiling for pitched roofs and vertical cladding. British Standards Institution.
- BS 5250:2021: Management of moisture in buildings — Code of practice. British Standards Institution.
- BS 6229:2018: Flat roofs with continuously supported flexible waterproof coverings — Code of practice.
- NHBC Standards Chapter 7.2: Pitched Roofs — Minimum pitches, rafter timber sizing, batten gauges and fixing specifications.
- UK Manufacturer Technical Literature: Marley Technical Handbooks, BMI Redland Fixing Guides, CUPA Pizarras Slate Technical Manuals.
Last technical audit date: 17 August 2026.