When lead flashing fails on a Watton home, water finds a way in fast - here is what good lead work involves, which materials suit which job, and what to weigh up before work starts.
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Lead has been used on British roofs for centuries because it outlasts almost every alternative when it is fitted correctly. It seals the joints where a roof meets a wall, chimney, dormer or skylight - exactly the points where water will enter if the seal breaks down. Poorly fitted or corroded flashing is a common cause of roof leaks, yet the repair itself is often straightforward when a competent roofer deals with it promptly.
Good lead work is done by hand on every type: step flashings, cover flashings, soakers, valleys, parapet cappings and flat roof coverings. Every piece is cut and dressed on site to fit the actual roof rather than bent cold from a generic off-cut.
Understanding what type of lead work your roof has - and what it should have - helps you ask the right questions when you call a roofer.
Lead sheet is sold in numbered codes based on its weight in pounds per square foot. The higher the code, the thicker and heavier the sheet. Getting the code right is not a detail to skip - undersized lead on a flat roof or valley will split from thermal movement within a few years.
A roofer who quotes for a flat roof covering using Code 4 where Code 6 is standard is cutting costs at your expense. It is worth asking which code they plan to use before work starts.
Lead is not the only material available for flashings and flat coverings. Several alternatives are marketed to homeowners, sometimes with claims that do not hold up over time. Here is a straightforward comparison so you can decide what suits your situation.
Traditional milled lead sheet remains the benchmark for longevity and workability. Correctly fitted flashings in Code 4 or Code 5 typically last 50 to 70 years or more. Lead is fully malleable, so a skilled roofer can dress it neatly into almost any shape - around curved brickwork, over complex chimney geometry, or into tight valleys. It is a heavy material, which is part of why it stays in place and resists wind lift. The main drawbacks are cost (lead is priced by weight and the metal market fluctuates), the skill required to fit it well, and the fact that lead theft remains a genuine problem on exposed or accessible roofs.
Zinc sheet is used on many modern and heritage-restoration projects. It is lighter than lead, has a natural grey patina that suits contemporary architecture, and is well-established in continental Europe. Zinc flashings are durable - typically 40 to 60 years in a domestic setting - but zinc is less forgiving to work than lead and requires a roofer experienced with the material. It is generally more expensive than lead per square metre installed.
Pre-formed aluminium flashing strips with a self-adhesive backing are available from builders' merchants and are sometimes used as a quick repair over failed lead. They are significantly cheaper to buy and quick to fit, but they are not a like-for-like replacement. Adhesive-backed aluminium strips have a service life measured in years rather than decades, they can lift at the edges in frost or prolonged heat, and they are not suitable for valleys or flat roof coverings. They have a place as a short-term patch on a roof awaiting full replacement, but they are not a permanent repair.
Some manufacturers produce formed plastic or composite soakers to sit beneath tiles alongside dormers and abutments. These are used by some roofers to speed up installation. The products have improved over the years and can be acceptable on new builds where everything is designed around them, but they lack the adaptability of cut lead on an older or irregular roof. On a Victorian or Edwardian property with hand-made bricks or uneven coursing, individually cut lead soakers and step flashings will always give a neater, more watertight result.
Where the question is about covering a flat roof rather than fitting flashings, lead is not always the right answer. EPDM rubber membrane is a practical and increasingly popular alternative for small flat roofs on extensions and bay tops. It is lighter than lead, competitively priced, and easier to handle on complex shapes. A well-fitted EPDM system can last 25 to 40 years. Traditional felt built-up roofing is cheaper upfront but has a shorter lifespan and is more vulnerable to ponding water. For heritage properties where the original covering was lead, matching it in kind is usually the most appropriate choice and may be required if the property is listed.
Lead does not usually fail on its own. When it does fail, there is nearly always an identifiable reason.
Good lead work is unhurried, hand-formed work. A roofer should inspect the existing masonry or timber substrate before any lead goes down - rotten fascia timbers, crumbling mortar or failed render underneath the old flashing will cause the new work to fail just as quickly as the old.
On a chimney, the sequence typically runs: strip old flashing and soakers, rake out mortar joints ready for new fixings, cut and dress new soakers to the tile gauge, step-flash up the slope in Code 4 or Code 5, fit a back gutter if needed, and point up with fresh mortar. On a flat roof the timber deck condition matters enormously - a new lead covering on a wet or failing deck is money wasted. The deck should be dry, firm and correctly ventilated before any lead goes down.
Bay sizes on a flat roof should be discussed with you before work starts. Code 6 lead in bays no wider than 600 mm, with proper drips between bays and a welted edge at the perimeter, is the standard most experienced roofers follow for domestic flat roofs.
Lead work is priced partly on the metal itself, which fluctuates with the commodity market, and partly on the time the job takes. As a rough guide, chimney flashing replacement on a standard two-pot chimney typically costs between £400 and £900, depending on the chimney size, the access needed and whether soakers have to be replaced alongside the flashings. Lead valley replacement on a standard pitched roof typically ranges from £300 to £700 per valley. Flat roof lead covering for a small bay roof or extension flat is typically priced between £80 and £140 per square metre installed, depending on the code specified and the complexity of the edges.
These are broad UK ranges and actual quotes will vary. What matters is that any quote specifies which lead code is being used, what is included (soakers, pointing, timber repairs if needed) and what is not. A quote that simply says "replace chimney flashing" without specifying the code or whether soakers are included is not a quote you can compare accurately against another.
A roofer who answers these questions clearly and without hesitation is one who knows the work. Vague answers or irritation at being asked are worth noting.
Based in Norwich, we carry out lead work across Norfolk including Watton and the surrounding area. We also work in Attleborough, Dereham, Wymondham, Hellesdon, Costessey, Taverham, Sprowston, Thorpe St Andrew, Aylsham, North Walsham and throughout the wider Norwich area.
If you have a leak around a chimney, dormer or flat roof, or you can see lifted or cracked lead flashing on your property, do not leave it to get worse over winter. Call us to arrange a roof survey in Watton and we will give you a straight assessment of what needs doing, which materials are right for the job, and a clear breakdown of the cost before any work starts.
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