If your roof is leaking around the chimney, a skylight or where two roof slopes meet, failing lead work is very likely the cause.
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Lead work is one of the most common sources of water ingress on UK roofs, yet it is often the last thing a homeowner thinks to check. The lead itself can last for decades when it is fitted correctly, but a small error during installation sets up a slow failure that can go unnoticed for months or years while water seeps into the structure below.
Lead flashing, valleys, and soakers are best fitted using traditional hand-dressed techniques, with lead sheet that meets BS EN 12588 standards. This page explains the warning signs to watch for, what usually causes them, and what a proper repair or replacement involves.
The most obvious sign of a lead failure is a damp patch on a ceiling or an interior wall, typically appearing after rain. However, the water entry point on the roof can be a metre or more away from where the staining appears inside, because water tracks along rafters and roof timbers before it drips.
Other warning signs include:
If you can safely look at your roof from a window or from ground level with binoculars, check the junction between the chimney stack and the roof slope first. Step flashings and back gutters at chimneys are where the majority of lead failures occur.
Lead is a soft, heavy metal that expands and contracts significantly with temperature change. A single sheet that is dressed too long without a drip or a roll will buckle, crack and eventually split. This is why traditional installation uses relatively short lengths, each overlapping the next, rather than single continuous sheets. When a roofer cuts corners on this, the lead appears fine on the day but fails within a few years as the metal fatigues.
Fixings are another common point of failure. Lead should be secured with copper or stainless steel clips fixed at intervals, not simply wedged in place or held only by mortar. When clips are absent or made of galvanised steel, they corrode and release the lead long before the lead itself gives out.
Pointing failure is a separate but related problem. The lead is usually turned into a chase cut or raked joint in the masonry, then pointed over with mortar or sealed with a lead-compatible sealant. When that pointing cracks and loosens, wind and rain get behind the flashing and lift it. On older properties this is almost inevitable over time, and re-pointing the chase is as important as the lead itself.
Poor original workmanship is also a significant cause. Lead requires proper dressing with a bossing mallet or dresser to form tight, weatherproof joints at corners and changes in direction. If the lead has simply been folded or forced into shape without dressing, the joint will not be watertight under sustained rain or driving wind.
A lead valley runs between two roof slopes and carries a large volume of rainwater. Debris builds up in valleys over time, moss and organic matter retain moisture, and the acidic run-off from some roofing materials can attack the lead surface. A lead valley that is thinning or pitting needs to be replaced before it perforates, because the water volume involved can cause significant structural damage in a short time.
Soakers are small individual pieces of lead fitted beneath each course of slates or plain tiles at a roof abutment. They are hidden under the tiles and rarely visible without removing them, but when they fail the result is persistent damp at a side wall junction that is difficult to trace without a proper inspection.
Before any lead work is carried out, the area needs a close-up inspection, not just a look from the ground. A good inspection will check the thickness and condition of existing lead, the state of the chase and pointing, whether fixings are present and intact, and the condition of any underlying timber or decking. On a chimney job this includes checking the stack itself for loose brickwork or failing mortar, because there is no point fitting new lead to a chimney that needs repointing separately.
If existing lead is in reasonable condition but has simply lifted at the edges or lost its pointing, a repair is often the right approach rather than full replacement. If the lead is cracked, thin, or incorrectly installed in the first place, replacement will be more cost-effective over time.
Water ingress through failed lead work does not only stain ceilings. Over time it can saturate roof insulation, cause timber rot in rafters and wall plates, and lead to mould growth in the roof space and on interior walls. The longer a lead failure goes unrepaired, the greater the associated repair bill becomes. A relatively modest lead repair bill can prevent several times that cost in structural repairs if caught early.
If you have noticed any of the signs above on your property in Stanton or a nearby village, call us to arrange a roof survey so we can assess the lead work and give you an honest view of what needs doing.
BS EN 12588 is the British and European standard for milled lead sheet used in construction. It sets requirements for thickness, composition and dimensional tolerances. Using compliant lead means you know the material will perform as expected over its full life rather than failing early due to impurities or inconsistent thickness. Lead used on roofs should meet this standard.
Code numbers for lead sheet run from Code 3 to Code 8, with higher numbers indicating greater thickness. The correct code for a given application is not a matter of preference. Code 3 (1.32 mm) is used for soakers. Code 4 (1.80 mm) is the minimum for flashings. Code 5 (2.24 mm) is used for valleys and larger flashings. Using underweight lead to save money is a false economy because thinner sheet fatigues and perforates far sooner. Any roofer quoting for lead work should be able to tell you which code they are using and where.
If you are in Stanton and have signs of a roof leak, or if you simply want a lead work inspection before the autumn and winter weather arrives, call Bury St Edmunds Roofers and ask for a roof survey. We will tell you honestly what we find and what your options are.
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