Buy Code 4 Lead • Flashings • Aprons • Exposed Weatherings

Code 4 Lead Flashing (3m & 6m Rolls)

Code 4 lead flashing is widely used for chimney flashings, aprons, stepped flashings and general exposed weatherings where the right balance of durability, workability and long-term performance is required. Available in 3m and 6m rolls, it is the standard choice for most general lead flashing work.

At approximately 1.80mm thick and 20.4kg/m², Code 4 is suitable for both traditional and modern roofing projects and is typically the correct specification for chimney flashings, stepped abutments and exposed roof junctions. For lighter concealed work, compare with Code 3 lead, while heavier aprons, valleys and wider weatherings may require Code 5 lead.

3m & 6m rolls
Standard for flashings
Aprons & stepped work
Exposed weathering
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Code 4 lead flashing roll for chimney flashings aprons and stepped abutments

Code 4 lead flashing roll used for chimney flashings, aprons, stepped abutments and general exposed roof detailing.

In stock for fast UK delivery. Use Code 4 lead where general flashing work, exposed weatherings and everyday roofing details require a versatile rolled lead sheet.

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code 4 300mm x 3m roofing lead

Code 4 Lead Flashing - 3m Rolls

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Code 4 Lead Flashing - 6m Rolls

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Code 4 lead uses • flashings • exposed applications

Where is Code 4 lead flashing typically used?

Code 4 lead flashing is the standard choice for many exposed roofing details, including chimney flashings, stepped abutments, aprons, cover flashings and general weatherings. It offers the balance most roofers need: thick enough for dependable external performance, but still workable enough to dress neatly into chases, steps and formed details.

Compared with Code 3 lead, Code 4 is more suitable for exposed flashings and visible weatherings. Compared with Code 5 lead, it is often the more practical option for standard flashing work where the detail does not yet demand a heavier code. If you need to compare sizes quickly, use the lead chart before ordering.

Typical Code 4 lead applications

  • Chimney aprons, back gutters and step flashings
  • Abutments where roof coverings meet walls
  • Cover flashings over soakers and stepped details
  • Dormers, rooflights and smaller formed roof junctions
  • General roofing weatherings where exposed lead is required
  • Traditional and modern flashing details where Code 4 is the standard specification

Why choose Code 4 over Code 3 or Code 5?

  • More suitable than Code 3 lead for exposed flashings and weatherings
  • Easier to form than heavier codes on routine flashing work
  • Widely recognised as the standard lead code for general flashing details
  • Strong balance of durability, flexibility and practicality
  • A logical middle ground before moving up to Code 5 lead for heavier bays, valleys and aprons

Chimney flashings

Code 4 is one of the most common specifications for chimney aprons, step flashings and back gutters. It is thick enough for reliable exposed weathering while still allowing neat dressing into masonry joints and stepped details.

Abutments and cover flashings

Where roofs meet walls, Code 4 is regularly used for cover flashings and stepped abutments. It provides dependable weather protection without moving into unnecessarily heavy sheet for standard domestic flashing work.

General exposed weatherings

For many everyday lead details, Code 4 is the practical standard. It bridges the gap between lighter concealed work in Code 3 and heavier weatherings in Code 5.

Code 4 vs other lead codes

Lead code Approx. thickness Approx. mass Typical use
Code 3 Lead 1.32mm 15.0kg/m² Soakers, covered flashings and lighter concealed details
Code 4 Lead 1.80mm 20.4kg/m² General flashings, aprons, cover flashings, stepped abutments and exposed weatherings
Code 5 Lead 2.24mm 25.4kg/m² Heavier aprons, valleys, bays, parapets and more demanding exposed weatherings
Code 4 lead flashing rolls in stock on warehouse racking
Code 4 lead flashing is one of the most commonly stocked and ordered lead codes for general roofing work.
Code 4 lead flashing roll ready for roofing applications
Rolled Code 4 lead sheet is widely used for chimney flashings, aprons and other exposed lead details.
Installed Code 4 lead flashing detail on a roof junction
Installed Code 4 flashing detail showing neat forming and dependable exposed weathering performance.
Use the Lead Chart Read The Lead Handbook Explore Lead Roofing Guides Shop Leadwork Fixings
If you are comparing lead codes for a project, use the lead chart to review sizes and options, compare with Code 3 lead and Code 5 lead, explore the wider rolled lead sheet range, or use The Lead Handbook and our lead roofing guides for wider technical context.