Why choose code 5 300mm 3m roofing lead?

The code 5 300mm 3m roofing lead roll is a versatile heavy-gauge sheet widely used for aprons, small back gutters, secret gutter channels, damp proof courses (DPCs) and detailed flashings where a robust, long-lasting weathering is required. The additional thickness of Code 5 provides greater durability and resistance to thermal movement, making it ideal for exposed or high-stress applications.

Produced to BS EN 12588, this material offers consistent thickness and weight distribution, ensuring predictable performance during forming. While BS EN 12588 defines the material standard, all workmanship must follow LSTA craft guidance and the detailing rules laid out in BS 6915, which govern fixings, joints, laps, bay limits and movement allowances.

The 300mm width makes this roll perfect for intricate and precise detailing, particularly where space is limited or where a smaller sheet reduces unnecessary weight. For quantity and sizing calculations, use our
Lead Flashing Calculator.

Typical uses for code 5 300mm 3m roofing lead

This roll format is suited to a wide range of detailing tasks, including:

• Apron flashings at roof-to-wall abutments.
• Small back gutters behind chimneys and upstands.
• Secret gutter channels on complex pitched roof interfaces.
• Damp proof courses (DPCs) at parapets and cavity trays.
• Individual stepped flashings where a heavier gauge is desirable.
• Covering small wood core rolls as cappings to hips or ridges on detailed heritage work.
• Intricate weatherings requiring precise shaping and long-term stability.

Why Code 5 is preferred for detailed and exposed work

Code 5 300mm 3m roofing lead offers the perfect balance between strength and workability for complex locations subject to high exposure. The heavier 2.24mm gauge provides:

• Improved resistance to fatigue and splitting in tight folds.
• Enhanced durability for high-traffic or high-weather areas.
• Better longevity when forming tight laps, joints and folded details.
• Stability when used as DPCs or structural interface weatherings.

For heritage, conservation and premium domestic projects, Code 5 is frequently specified due to its exceptional service life and reliability.

Installation guidance

Install code 5 300mm 3m roofing lead in accordance with the Lead Sheet Training Academy manuals and the national detailing standard BS 6915. These define:

• Correct lap sizes for aprons, gutters and stepped flashings.
• Movement joint requirements for Code 5 gauge.
• Permissible bay sizes and fixed/floating detailing.
• Fixing positions and mechanical restraint methods.

BS EN 12588 sets the material standard only. For workmanship standards, see:
BS 6915 – The Lead Lads Summary
Neal Roofing – BS 6915 Overview

Apply patination oil post-installation to achieve an even, stain-free weathered finish.

Installation essentials

1. Prepare substrate: Ensure smooth backing surfaces and use
   Lead Underlay.
2. Set out details: Lap flashings, gutters and DPCs to BS 6915.
3. Fix securely: Use copper or stainless fixings from
   Leadwork Fixings.
4. Form joints: Create neat steps, folds and laps suited to Code 5 thickness.
5. Finish: Apply patination oil and check all terminations.

Further learning & resources

Material standard information:
BS EN 12588 – Ultimate Guide.

Additional technical support is available via
The Lead Handbook
and our main hub at
The Lead Lads.

For examples of high-quality workmanship, see
Neal Roofing Leadwork Services.

Recommended accessories

Use code 5 300mm 3m roofing lead with:
Lead Underlay,
Patination Oil,
Lead Mate Sealant,
and professional fixings from
Leadwork Fixings.

At a glance — code 5 300mm 3m roofing lead

All values approximate. Use BS EN 12588 for material specification and follow LSTA / BS 6915 for workmanship and detailing.