Lead For Roofing

The case for rolled lead sheet

Rolled (milled) lead remains one of the most durable and adaptable roofing materials available. When manufactured to the correct standard and detailed correctly, it delivers long service life, reliable performance and excellent workability across modern and heritage projects.

BS EN 12588: standard for rolled lead sheet

BS EN 12588 defines the material characteristics and dimensional consistency required for rolled lead used in roofing and cladding. Buying lead sheet made to BS EN 12588 helps ensure a stable, reliable product for flashings, valleys, gutters and flat roofing applications.

Codes of rolled lead sheet (3–8)

Rolled lead is supplied in “codes”, each representing a thickness and weight. Selecting the correct code depends on exposure, span and detailing requirements:

• Code 3 – soakers, step flashings, light-duty flashings.
• Code 4 – general chimney flashings, abutments, cover flashings.
• Code 5 – valleys, gutters, weatherings, exposed details.
• Code 6 – parapet gutters, robust coverings, short flat roof bays.
• Code 7 – dormers, wide gutters, heavy-duty roof details.
• Code 8 – large bays, high-exposure work, long-life installations.

Heavier codes accommodate greater span and thermal movement, improving durability on exposed or heavily loaded areas when detailed correctly.

Sandcast lead

Sandcast lead is a traditional material produced by casting molten lead onto sand beds. Its characterful appearance makes it a popular choice for conservation and listed building work, especially where authenticity is important.

• Authentic heritage appearance for conservation projects.
• Excellent durability when detailed to appropriate guidance.
• Specialist supply available on request.

If you need pricing for sandcast lead or assistance recycling existing leadwork, please contact us.

Fixings for lead roofing

Correct fixings and restraint are essential for durable leadwork. They help manage wind uplift and thermal movement, supporting long-term performance across flashings, gutters and bays. Common components include:

• Copper, stainless steel or phosphor bronze nails – compatible fasteners for securing lead details where specified.
• Stainless steel or lead clips – restrain edges and laps while allowing movement.
• Wood core rolls – for traditional raised rolls and defined bay sizing.
• Lead wedges – secure flashings into masonry joints.

The Reclaimed Company® stocks a practical range of leadwork fixings and sundries for installation. For a wider selection of accessories, browse the dedicated Lead Lads® Lead Shop.

BS 6915 & LSTA guidance: installation principles

BS 6915 and LSTA guidance set out best-practice detailing for lead sheet roofing and cladding, helping manage movement and prevent splitting, buckling and staining. Core principles include:

1. Thermal movement: size bays and details to accommodate expansion and contraction.
2. Restraint: use clips and fixings that secure the lead while allowing movement.
3. Joints: form laps, welts and rolls correctly to remain watertight and reduce capillary risk.
4. Underlay/separation: use a suitable underlay beneath lead to reduce friction and protect surfaces.
5. Patination oil: apply to new lead where specified to reduce staining and improve early weathering behaviour.
6. Workmanship: use trained installers familiar with lead detailing guidance and good practice.

Code 3 milled lead for roofing – characteristics & uses

• Typical uses: soakers, step flashings and lightweight detailing.
• Why choose it: highly malleable and easy to dress around details.
• Best practice: confirm cover widths and detailing to LSTA guidance for movement control.

Summary: Code 3 is a lightweight option for soakers and light flashings. For wider cover widths or exposure, step up to Code 4 or above.

Code 4 milled lead for roofing – characteristics & uses

• Typical uses: chimney flashings, abutments and general cover flashings.
• Why choose it: balance of flexibility and strength—often the default for flashing work.
• Best practice: use correct restraint and laps to manage thermal movement.

Conclusion: Code 4 is frequently specified for flashings and general roofing detailing across modern and heritage projects.

Code 5 milled lead – characteristics & uses

• Typical uses: valleys, gutter linings, weatherings and exposed details.
• Why choose it: greater stiffness for exposed areas while remaining workable.
• Best practice: follow LSTA bay sizing and detailing for movement control.

Code 6 milled lead – characteristics & uses

• Typical uses: parapet gutters, trays, robust junction details and short flat bays.
• Why choose it: heavier sheet for demanding details and longevity.
• Best practice: confirm bay sizes, restraint and underlay/separation to guidance.