Code 4 Lead Flashing 300mm x 3m
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Product Details
Code 4 lead flashing is a medium‑weight, flexible lead sheet used to create long‑lasting, waterproof joints on roofs and around chimneys. This 300mm x 3m roll is ideal for flashing along walls, chimney upstands and roof abutments where a wider cover is needed to shed water effectively. The lead is easy to cut and dress with basic tools, so you can shape it neatly over tiles, slates or brickwork for a professional finish. Once installed and treated with patination oil, it offers excellent durability and weather resistance, making it a popular choice for both repairs and new roofing projects.
As of August 2026, PriceNailer data confirms that the cheapest price for Code 4 Lead Flashing 300mm x 3m is £45.17 from Selco across 2 suppliers. Prices have increased by 3.3% over the last 9 months.
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Frequently Asked Questions
What does Code 4 lead flashing mean?
Code 4 refers to the thickness and weight of the lead sheet - it's 1.8mm thick and weighs 20.4kg per square metre. This makes it a medium-weight option that's flexible enough for most roofing applications while providing excellent durability.
How much area does a 300mm x 3m roll of lead flashing cover?
A 300mm x 3m roll covers 0.9 square metres (3m length × 0.3m width). This size is perfect for standard chimney flashings, wall abutments, and most roof detail work where wider coverage is needed.
Can I cut Code 4 lead flashing with normal tools?
Yes, Code 4 lead is easy to cut with basic tools like a sharp knife, tin snips, or a saw. It's also malleable enough to dress by hand over tiles, slates, and brickwork for a neat, professional finish.
Is 300mm wide lead flashing suitable for chimney work?
Yes, 300mm width is ideal for most chimney applications including back gutters, side flashings, and front aprons. This width provides excellent water shedding coverage while being manageable to install around chimney details.
Does Code 4 lead flashing need any treatment after installation?
Yes, it's recommended to treat newly installed lead flashing with patination oil. This accelerates the natural weathering process and helps the lead develop its protective patina coating more quickly for enhanced longevity.