Why choose code 5 300mm 6m roofing lead?

The code 5 300mm 6m roofing lead roll is a premium heavy-gauge sheet designed for wider flashings, robust soakers, chimney weatherings and exposed roof details. At 300mm wide and 6m long, it delivers generous coverage while maintaining the strength, rigidity and long service life that make Code 5 the professional choice for demanding applications.

Produced to BS EN 12588, this sheet offers consistent thickness, predictable behaviour during forming and excellent resistance to fatigue cracking. The code 5 300mm 6m roofing lead is frequently specified on high-spec domestic roofs, heritage projects and structural weatherings where durability and stability over decades are essential.

The combination of 300mm width and 6m length makes this roll especially efficient on site. It reduces the number of joints required along runs of flashing or weathering, helping to improve watertightness while keeping handling practical for experienced installers.

For bay sizing, coverage and material calculations, use our
Lead Flashing & Lead Roll Calculator.

Typical uses for code 5 300mm 6m roofing lead

This wider roll format is chosen for heavy-duty and exposed applications where the lead sheet forms an important weathering element rather than a small trim. Common uses include:

• Chimney apron flashings, back gutters and side flashings.
• Medium-width soakers to slate or tile roofs in exposed locations.
• Cover flashings to abutments and parapet junctions.
• Dormer cheeks and small roof projections on premium projects.
• Replacement of failed Code 3 or Code 4 flashings with a more robust gauge.
• General weatherings on conservation or heritage roof schemes.

Design considerations for 300mm Code 5 sheets

With code 5 300mm 6m roofing lead, detailing is key. Wider flashings experience greater thermal movement and surface loading than narrow strips, so correct bay lengths, fixings and laps must be used to control movement and minimise fatigue.

• Keep individual flashing lengths within recommended bay sizes for Code 5.
• Use stepped or staged laps where changes in direction occur around chimneys and abutments.
• Install over a suitable underlay from our
  Lead Underlay range to protect against underside corrosion.
• Maintain adequate falls to shed water and avoid ponding.
• Allow for building and thermal movement in the detailing of joints and fixings.

Installation guidance for this 300mm 6m Code 5 roll

Heavy-gauge sheets should always be installed in line with BS EN 12588 workmanship principles and LSTA/LSA guidance. This includes correct chase depth, fixing type, fixing position and allowance for thermal expansion.

Newly laid code 5 300mm 6m roofing lead should be treated with patination oil to control early carbonate staining and encourage even weathering across the sheet.

For sealing chases and edges, use mortar or
Lead Mate Sealant
depending on the detail required and substrate conditions.

Installation essentials

1. Prepare the substrate: Ensure any backing or chase is clean, sound and correctly sized.
2. Set out lengths: Divide runs into appropriate bay lengths for Code 5, with adequate laps.
3. Fix and clip: Use copper or stainless fixings from our
   Leadwork Fixings range, positioned to allow movement.
4. Seal joints: Finish with mortar or Lead Mate Sealant for a durable, watertight result.
5. Finish the surface: Apply patination oil immediately after installation to all exposed areas.

Further reading & professional resources

For additional context on Code 5 leadwork, bay sizing and detailing, explore
The Lead Handbook,
our main platform
The Lead Lads,
and expert leadwork guidance from
Neal Roofing.

Recommended accessories

Pair code 5 300mm 6m roofing lead with:
Lead Underlay,
Patination Oil,
Lead Mate Sealant,
and high-quality fixings from our
Leadwork Fixings collection.

At a glance — code 5 300mm 6m roofing lead

All figures approximate. Install in accordance with BS EN 12588 and LSTA/LSA leadwork guidance.