Lead Work in Stowmarket

Expert Lead Work
in Stowmarket

Why Lead Work Fails - and What to Look For

Lead is one of the most durable materials used in roofing, but even well-installed lead work has a lifespan, and when it starts to go, it rarely announces itself loudly. Water finds the smallest gap and travels before it ever shows up as a stain on your ceiling. By the time you notice damage inside, the lead on your roof has often been failing for months.

Understanding the warning signs helps you act before the repair bill grows. Here is what to look for, and what is usually causing it.

The Warning Signs Homeowners Miss

• Damp patches on a chimney breast wall or ceiling - These almost always point to flashing failure around the chimney base or its back gutter. The flashing is the lead that seals the joint between the chimney masonry and the roof tiles. When it lifts, splits, or pulls away from the mortar chase, rainwater runs straight in.
• Staining or tide marks on an upstairs ceiling near a dormer or skylight - Dormers rely on soakers and step flashings to stay watertight. If either lifts or corrodes, you get slow, intermittent ingress that is worst after heavy rain and almost invisible in dry spells.
• Water in the roof space after rain, but no obvious broken tiles - Valley lead is a common culprit. Valleys take a high volume of water and any split, lifted joint, or failed sealant allows water through even when every tile above it looks intact.
• White powdery deposits on lead - This is lead carbonate, a natural weathering product. A small amount is normal. Heavy deposits forming at joints can indicate movement and cracking, especially if the lead was installed in oversized sections without proper expansion allowance.
• Cracked or missing mortar at the top edge of flashing - The mortar pointing that holds lead into a masonry chase is not the primary seal - the tucked lead itself is. But if the pointing fails and lets water sit behind the flashing, the lead will lift and the joint opens up.
• Corrugated or rippled lead surface - Lead expands and contracts with temperature. If sections are too long or were not dressed with proper rolls, the metal buckles rather than moving freely. Over time, this causes fatigue cracking at the stress points.

What Actually Causes Lead Work to Fail

Poor installation is the single biggest cause of early failure, but not always for the reason people assume. Lead itself is extremely long-lived - properly installed code 4 or code 5 lead on a pitched roof can last 60 years or more. The problems almost always come from how it was put in.

A common problem is using sections that are too long. Lead must be installed in manageable lengths - generally no more than 1.5 metres for flashings - to allow for thermal movement. If a single piece runs further than that without a proper drip or overlap joint, it will buckle and crack at the weakest point. This is a basic error that shows up years after a shoddy installation.

Inadequate fixing is another cause. Lead flashings should be dressed into a proper chase cut into the mortar joint, secured with lead wedges, and pointed with mortar or a suitable flexible sealant. Using mastic alone as the primary fixing - which some contractors do to save time - gives a result that lasts a few years at best before it shrinks and cracks.

Oxidation and corrosion can affect lead that sits in contact with lime-rich mortar or certain treated timbers. Portland cement mortar is generally fine, but some older buildings with lime mortar can cause surface attack over decades. This is rarely severe enough to cause failure on its own, but it is worth knowing about on older properties.

Finally, physical damage from foot traffic is more common than people realise. Anyone working on a roof - antenna fitters, solar panel installers, chimney sweeps - can lift or crack a flashing by standing on it. Always check lead work after any other trade has been on your roof.

What Lead Work Covers on a Typical House

Lead work is not just about chimneys. On a typical house, you may have lead in several locations:

• Step and cover flashings around chimney stacks
• Back gutters (the horizontal lead behind a chimney on the upper slope)
• Valley linings between adjoining roof pitches
• Soakers beneath tiles at abutments and around dormers
• Apron flashings above dormer windows
• Saddles at roof ridges where a chimney meets a ridge
• Flat roof upstands and skirtings where a flat section meets a wall or parapet

Each of these requires slightly different detailing. A chimney back gutter, for example, needs a proper drip at the lower edge and enough fall to clear water away. A valley must be wide enough to carry peak flow without overtopping. Getting these details right is the difference between a job that lasts decades and one that leaks within a couple of winters.

How Much Does Lead Work Cost?

Costs vary depending on what needs doing, how much lead is involved, and how accessible the area is. As a rough guide for UK homeowners: re-flashing a chimney on a standard semi-detached house typically costs between £300 and £600. Replacing a full lead valley can range from £400 to £900 or more, depending on length and whether tiles need lifting and re-setting. Small soaker and flashing repairs may start from around £150 to £250 for straightforward access work.

These are honest typical ranges, not fixed prices. A proper assessment of your specific roof is always the starting point - costs depend on roof height, pitch, the existing condition of surrounding tiles, and whether any masonry work is needed at the same time.

How We Work

We use traditional hand-dressing techniques rather than torch-on shortcuts. Hand-dressing means the lead is worked cold into position using bossing mallets and dressers, forming tight, accurate joints without the risk of burning or thinning the metal that comes with heat work on complex shapes.

We serve Stowmarket and the surrounding area from our base in Bury St Edmunds. If your roof is showing any of the signs described above, do not wait for the problem to reach your ceilings - call us to arrange a roof survey and we will give you a straight assessment of what needs doing.