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UKUK Building Regulations
References & Sources
Standards Cited
- BS EN 14081 — Timber structures — Strength graded structural timber
Defines grading rules and standard dimensions for structural timber in the UK - BS 5268-2 — Structural use of timber — Code of practice for permissible stress design
Guidance on timber selection and sizing for structural applications
Formulas Used
- Member count (area-based):
count = ceil(perpendicularSpan / spacing) + 1
Source: BS 5268-2 — Perpendicular span = area / member length; +1 for the end member - Total linear length:
totalLength = memberCount × memberLength
Source: Basic geometry - Volume:
volume = totalLength × crossSectionWidth × crossSectionDepth
Source: Basic geometry
Key Assumptions
- Timber sizes use finished (planed) dimensions: e.g. 47 × 75 mm — BS EN 14081
- Standard timber lengths: 2.4m, 3.0m, 3.6m, 4.2m, 4.8m — UK timber merchants standard stock