Leadwork

15 articles

• BS EN 12588 Lead Sheet: Code 3-8 Thickness & Use Guide
  BS EN 12588 Code 3–8: thicknesses (1.32mm to 3.55mm), weights (14.97 to 40.26 kg/m²), colour coding system (green=3 to orange=8), application guide by element, thermal expansion calculations
• LCA LEADSKILLS Qualification: Levels 1-3 & Why It Matters
  LEADSKILLS Levels 1–3 (introductory to heritage), approved training centres, NVQ equivalencies, CSCS card routes, LCA membership vs individual certification, why heritage clients specify LCA certified leadworkers
• Lead & Metal Compatibility: Zinc, Aluminium & Copper Guide
  Lead vs zinc (severe corrosion), lead vs aluminium (severe), lead vs copper (mild), lead vs stainless (negligible), separation methods (bituminous felt, EPDM, neoprene), run-off separation requirements
• Lead Bossing: Tools, Techniques & Angle Forming Guide
  Internal and external angle bossing step-by-step, wood-cored roll with copper rivets (max 150mm spacing), annealing at 150–200°C, tool list (bossing mallet 450g, bossing stick, chase wedge), Code 4 minimum for bossing
• Lead Chimney Flashings: Back Gutter, Steps & Apron Guide
  Four-element chimney set (back gutter, step-and-cover sides, front apron), Code 4 throughout, back gutter 75mm wide minimum, step soakers at each tile course, front apron 150mm up chimney and 150mm onto tiles
• Lead Dormer Flashings: Back Gutters, Cheeks & Code 4/5
  Cheek flashings, back gutter (75mm depth, 150mm width minimum, Code 4), back gutter outlets, step-and-cover at cheek/roof junction, thermal movement provision per element, common failure modes
• Lead Fixings: Copper Clout Nails & Stainless Clips Guide
  Copper clout nails (40mm × 3.35mm) or stainless clips, 500mm maximum centres (450mm exposed), lead tack minimum 50mm × 50mm Code 3, why zinc/galvanised fixings cause electrolytic failure, substrate pull-out values
• Lead Flat Roof: Maximum Bay Sizes & Code 5/6 Details
  Code 5 minimum, bay maximums (Code 5: 2,250mm × 675mm; Code 6: 3,000mm × 850mm), hollow roll 50mm × 50mm minimum, drip 50mm minimum, dog-ear corners, fall 1:80 recommended
• Lead Hip & Ridge Rolls: Code 4 vs 5 Sizing Guide UK
  Code 4 minimum, 1,500mm maximum bay, tack fixing at 500mm centres, bossing vs machine-forming, saddle and gusset pieces at valley/hip junctions, common split and lifting failure modes
• Lead Parapet Gutters: Width, Falls & Drips Guide UK
  Minimum 150mm width (225mm for catchments over 50m²), Code 5 standard, falls 1:80 minimum, drips at 1,500mm maximum, outlet sizing by BS EN 12056-3 catchment calculation, mandatory overflow sump
• Lead Soakers & Cover Flashings: Code 3/4 Sizing Guide UK
  Code 3 soakers with Code 4 cover flashings, soaker sizing formula (gauge + lap + 25mm), cover flashing 65mm minimum into joint, 75mm lap, maximum 1,500mm bay length, pointing materials (lead wool preferred)
• Lead Thermal Expansion: Maximum Bay Lengths & Drip Heights
  Lead expansion coefficient 29.3×10⁻⁶/°C, UK roof temperature range −10°C to +80°C, bay limits by code (Code 3/4: 1,500mm; Code 5: 2,250mm; Code 6: 3,000mm), failure diagnosis from undersized bays
• Lead Valley Gutters: Width, Code & Drip Details UK
  Open vs closed vs swept vs woven valley types, minimum 150mm clearance width, Code 4 standard (Code 5 for large catchments), maximum 1,500mm bays, 50mm drip height, catchment area calculation method
• Lead Waste Regulations UK: COSHH, EWC Codes & Disposal
  EWC code 17 04 03 (hazardous), consignment notes and registered carrier, scrap value £1–£1.80/kg, CLAW Regulations 2002 OEL 0.15 mg/m³, no dry cutting/grinding, blood lead monitoring thresholds
• Leadwork on Listed Buildings: Historic England Guide
  Listed Building Consent for material substitution, like-for-like code weight matching (Code 6–8 on pre-1900 buildings), LCA Heritage certification, conservation officer pre-application advice, natural vs artificial patination