Code 4 Lead Flashing

Code 4 lead flashing is a versatile mid-weight rolled lead sheet used to prevent
water ingress and provide long-lasting weatherproofing at roof junctions. Manufactured to
BS EN 12588, Code 4 lead flashing offers the ideal balance of strength
and workability for most pitched roof details, making it the default choice for domestic, heritage and commercial projects.

Code 4 lead flashing is ideal for:

• Step flashings to chimneys and abutments
• Soakers used with thicker or heavier slates such as stone slates or Westmorland slates
• Dormer cheek cladding and small vertical panels
• Vertical cladding details formed in welted or standing-seam panels
• Apron flashings and abutment flashings to pitched roofs and parapets
• Valley linings on pitched roofs in moderate-exposure zones
• Lead gutter linings and narrow box gutters
• Bay window roofs and smaller flat or low-pitched roof areas
• Lead welding, patch repairs and localised detailing work
• Smaller technical details such as cladding timber balls, finials and feature mouldings
• Parapet wall cappings installed in welted panels with correct drips and laps

Technical Specifications

Code 4 lead flashing is a mid-weight rolled lead sheet manufactured to
BS EN 12588, offering a reliable balance of strength and workability for most pitched roof details.

Code 4 Lead – Key Data

• Code: Code 4 (roofing grade rolled lead)
• Nominal thickness: approx. 1.80 mm
• Weight: approx. 20.41 kg/m²
• Tolerance: ±5% in accordance with BS EN 12588
• Formats: 3 m and 6 m rolls, cut to length on request

Composition & Standards

All of our Code 4 lead flashing is produced to BS EN 12588:2006, the British and European
standard for rolled (milled) lead sheet. This ensures:

• Consistent thickness across the sheet with a strict ±5% tolerance
• Uniform composition with a minimum 99.95% lead content
• Excellent malleability for dressing around chimneys, abutments and complex details

The Code 4 designation refers to the weight per square metre, helping designers and installers
select the correct lead code for each roofing application.

Installation Considerations for Code 4 Lead

• Allow for thermal expansion with correct bay sizes, laps and welts
• Use copper or stainless steel fixings to prevent galvanic corrosion
• Apply patination oil after installation to reduce white carbonate staining
• Avoid direct contact with timber treatments that contain ammonia or aggressive chemicals

Installation should follow BS 6915 and current LSTA (Lead Sheet Training Academy) guidance
on bay sizing, fixings, underlay and ventilation.

Sustainability & Heritage Value

Lead is one of the most sustainable roofing materials available. Offcuts and end-of-life material
can be recycled indefinitely without loss of performance. Code 4 lead flashing is also widely specified for
heritage and conservation work, helping maintain the original character of churches, listed buildings
and period roofs.

Ordering Information

We stock a full range of Code 4 lead flashing widths and can support both small works and large-scale projects:

• Competitive bulk and trade pricing
• Nationwide pallet delivery or yard collection
• Custom cutting (1–6 m lengths) by arrangement
• Support with material schedules and code selection

If you need help choosing the right lead code, widths or bay layout, our team can advise or connect you
with specialist leadworkers through our wider group.

Composition & Standards

All of our Code 4 lead flashing is manufactured to
BS EN 12588:2006, the British and European standard for rolled (milled) lead sheet.
This ensures material consistency, durability and predictable performance on site.

• Consistent thickness with a strict ±5% tolerance
• Uniform composition with a minimum purity of 99.95% lead
• Excellent malleability for dressing around complex contours and junctions

The Code 4 designation refers specifically to the weight per square metre, offering an
ideal mid-strength material suitable for most pitched roof applications.

🔧 Installation Considerations for Code 4 Lead

• Allow for thermal expansion using correct laps, welts and fixings
• Use copper or stainless steel fixings to prevent galvanic corrosion
• Apply patination oil to reduce white carbonate staining
• Avoid contact with timber treatments containing ammonia or acidic compounds

Our team can provide installation guidance or assist with detailing in accordance
with BS 6915 and LSTA (Lead Sheet Training Academy) recommendations.

🌱 Sustainability & Heritage Value

Lead is one of the most sustainable roofing materials available. Nearly 100% of offcuts
and reclaimed lead can be recycled indefinitely without degradation.
Code 4 lead flashing also holds significant heritage value, making it a preferred or
required material for conservation, restoration and listed building projects.

🛒 Ordering Information

We supply a full range of Code 4 lead flashing sizes and can accommodate both small and large projects:

• Bulk and trade pricing available
• Nationwide pallet delivery
• Click-and-collect from our reclaim yard
• Custom cutting (1–6 m lengths) and project-specific packs

Need a bespoke size or help selecting the correct code?
Our team can assist with heritage specifications, roofing details and material schedules.

Code 4 lead Flashing 

Technical Information

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