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UKUK Building Regulations
References & Sources
Standards Cited
- BS 6150 — Painting of buildings — Code of practice
Defines standard coverage rates, surface preparation requirements, and number of coats guidance
Formulas Used
- Wall area:
wallArea = 2 x (roomLength + roomWidth) x wallHeight
Source: Basic geometry (room perimeter x height) - Net wall area:
netWallArea = wallArea - (numDoors x 2.0) - (numWindows x 1.5)
Source: BS 6150 — Standard door deduction: 2.0 m2, standard window deduction: 1.5 m2 - Effective coverage:
coveragePerLitre = baseCoverage x surfaceFactor
Source: BS 6150 / manufacturer data (Dulux, Crown) — Surface factors: good condition 1.0, poor condition 0.8, new plaster 0.7 - Total litres:
totalLitres = (totalArea / coveragePerLitre) x numberOfCoats
Source: BS 6150 - Cans needed:
cansNeeded = ceil(totalLitres / 5)
Source: Standard 5L can size
Key Assumptions
- Base coverage rates: emulsion 12 m2/L, masonry 5 m2/L, wood/trim 10 m2/L, primer 10 m2/L — BS 6150 / Dulux and Crown manufacturer guidelines
- Surface condition factors: good (previously painted) 1.0, poor 0.8, new plaster/porous 0.7 — BS 6150
- Standard door area deduction: 2.0 m2 (approx 2m x 1m) — Industry standard practice
- Standard window area deduction: 1.5 m2 (approx 1.2m x 1.25m) — Industry standard practice
- Standard can size: 5 litres — Dulux / Crown standard product sizes