Why choose the Premium Code 4 850mm 6m Roofing Lead?

The code 4 850mm x 6m roofing lead is one of the largest and most premium wide-format rolled lead options available for UK roofing professionals. At 850mm wide, this long-length sheet delivers exceptional coverage for major weathering tasks including deep parapet walls, extensive chimney gutters, wide abutments, dormer structures, flat-to-pitched transitions and heritage-grade detailing where substantial single-sheet protection is essential.

Manufactured to BS EN 12588, the code 4 850mm x 6m roofing lead provides outstanding thickness consistency, malleability and durability. Code 4 is the UK’s most widely specified grade, offering the optimum balance of strength and flexibility — especially important at this ultra-wide format.

When large coverage is required without increasing beyond Code 4 weight, the 850mm width is the perfect solution. This sheet significantly reduces the need for jointing, improves waterproofing performance, and ensures a smooth, continuous architectural finish.

For quick calculations and ordering accuracy, use the
Lead Flashing Calculator.

Typical uses for Code 4 850mm 6m Roofing Lead

• Large parapet wall flashings and full surface coverings.
• Deep chimney back gutters, stepped flashings and front aprons.
• Major box gutter lining across commercial or heritage roofs.
• Flat-to-pitched transitions requiring wide protective coverage.
• Dormer cheek cladding on extended structures.
• Complex weatherings on churches, listed buildings and period properties.
• Wide abutment flashings where narrower sheets would require multiple laps.

The advantages of choosing a 6m long roll

The code 4 850mm x 6m roofing lead offers the highest possible coverage before stepping up to heavier gauges such as Code 5 or Code 6. Because the roll extends to 6m, it eliminates a significant number of joints, improves installation speed and greatly enhances long-term waterproofing performance.

• Minimal jointing across large roofing features.
• Superior longevity and reduced water ingress risk.
• Cleaner aesthetics on visible architectural elements.
• Ideal for heritage work that demands large single-sheet coverage.
• Efficient installation for professional roofing teams.

Best practice for installing 850mm lead

At 850mm wide, this sheet must be fully supported and installed with careful attention to movement allowance. Always ensure the substrate is smooth, continuous and free from sharp edges. Wider lead sheets are more sensitive to thermal expansion, so correct detailing is essential.

Dress the sheet carefully without overstretching, and seal chases using traditional mortar or
Lead Mate Sealant.

Apply patination oil immediately after installation to protect against carbonate staining and to encourage even early weathering.

Installation essentials

1. Prepare the substrate: Ensure full support over the entire 850mm width.
2. Shape the sheet accurately: Dress code 4 850mm x 6m roofing lead with care to avoid stretch marks.
3. Fix correctly: Use copper or stainless fixings from our
   Leadwork Fixings Range.
4. Seal the chase: Finish with mortar or Lead Mate Sealant.
5. Protect the finish: Apply patination oil over the full sheet area.

Further reading & professional resources

Explore installation standards and industry guidance via:
The Lead Handbook,
The Lead Lads,
and detailed roofing resources at
Neal Roofing.

Complete the system

Pair code 4 850mm x 6m roofing lead with:
Hall Clips,
Lead Underlay,
Lead Mate Sealant,
Patination Oil,
and more within our
Accessories Category.

At a glance — Code 4 850mm 6m Roofing Lead

Figures are approximate. Always follow BS EN 12588 and LSTA/LSA guidelines for wide-sheet installation.