About Us: RoofPitchCalculator.co.uk is the United Kingdom's premier construction mathematics resource, providing professional architects, structural engineers, roofing contractors, quantity surveyors, and homeowners with instant, accurate, British Standards-compliant calculations for roof geometry, timber cut lines, and material estimates.
Our Engineering Mission
Roof construction in the UK is governed by strict Building Regulations and harsh climate exposure zones. A geometric error of just 2 degrees can lead to water penetration, timber rot, or invalidated product warranties. We built RoofPitchCalculator.co.uk to eliminate ambiguity by providing transparent formulas, live interactive visualizers, and authoritative British Standards references completely free of charge.
📚 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.