If you have a leak around a chimney, dormer or valley in Taverham, failing lead flashing is the most likely cause.
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Lead has been used on roofs for centuries because it outlasts almost every alternative when it is cut, fitted and dressed correctly. The material is soft enough to be shaped around complex junctions on site, and it expands and contracts with temperature changes without cracking, provided the original installation was done properly.
The main areas where lead work is needed on a typical house are chimney flashings, step and cover flashings on adjoining walls, valley gutters between two roof slopes, dormer cheeks, flat roof upstands and parapet copings. Each of these is a junction where two surfaces meet, and junctions are where water gets in when the seal fails.
When we carry out lead work, every piece is cut and dressed on site to fit the actual roof rather than bent roughly into place from a stock length. A correctly dressed flashing sits tight to the masonry or timber, is tucked into a raked mortar joint and fixed so it cannot lift in wind. The mortar joint is then pointed with a suitable mix to seal the top edge.
The most common problem with lead flashing is cracking caused by thermal movement. Lead expands in warm weather and contracts in cold. If a single piece of lead is too long, or if it has been fixed in a way that prevents movement, it will split over time. Individual sections of flashing should generally be no longer than 1.5 metres for this reason.
A second common problem is fatigue cracking on flat lead roofs and valley gutters. Lead that was laid too thin for the application gradually hardens and develops small cracks after years of movement. Once those cracks appear, water tracks underneath and the leak can appear some distance from the actual entry point, which makes it confusing to diagnose.
Poorly pointed mortar joints are another frequent cause of failure. The lead itself may still be in good condition, but if the mortar holding the top edge into the masonry has crumbled away, the flashing lifts in wind and water drives behind it. This is repairable without replacing the lead entirely, provided the lead is still sound and correctly dressed against the wall.
On older properties, original lead work sometimes used a lead code that is now considered too light for the application. Code 3 lead is appropriate for some vertical surfaces, but valley gutters and flat areas generally need Code 4 or Code 5. Using a lighter code than the application demands shortens the working life considerably.
Chimney flashings are made up of several separate components. The back gutter sits behind the chimney stack and collects water running down the main roof slope. The two side flashings step down the slope in overlapping sections. The front apron covers the junction at the bottom front face of the chimney. Each piece must be fitted individually and lapped correctly so water is always directed onto the next piece below it rather than allowed to sit between pieces.
A chimney that has been repointed recently can sometimes cause flashing problems because the new mortar lifts slightly as it cures, breaking the seal at the top edge of the flashing. If you have had chimney pointing done and noticed a new leak afterwards, that is a likely explanation.
Failed chimney lead work is one of the more straightforward lead repairs to carry out, provided access is safe. On a standard two-storey house in Taverham or the wider Norwich area, a full chimney re-flash using new lead is a half-day to full-day job depending on chimney size and access.
A lead valley gutter runs along the line where two roof slopes meet. It collects a large volume of water from both sides and channels it down to the gutter at the eaves. Because of the volume of water involved and the fact that lead in a valley is largely horizontal, valley gutters must be formed from a heavier lead code than vertical flashings, and each section must be lapped correctly over the one below.
A badly formed valley is one of the more damaging roof leaks a homeowner can have, because water may be tracking into the roof structure for a long time before it shows as a stain on a ceiling. If you notice damp or staining along a central point of an upstairs ceiling, a valley gutter problem is worth investigating before anything else.
Repairing a valley often means lifting the slates or tiles either side to access the lead underneath. On a tiled roof, the tiles along the valley are usually cut at an angle and bedded, which makes stripping and relaying more time-consuming than on a slate roof where the pieces can usually be lifted and relaid without damage. The cost of a valley repair therefore varies quite a bit depending on the tile type and how the valley was originally constructed.
Dormers have more lead junctions than almost any other roof feature. The cheeks (the sides of the dormer) are typically clad in lead or another sheet material. The junction where the dormer roof meets the main roof slope on each side requires step flashings. The front face of the dormer where it meets the main roof below needs an apron flashing. All of these points are potential entry points for water if the lead fails or was never dressed correctly in the first place.
Poorly fitted dormer lead work is a known problem on properties where dormers were added later rather than built as part of the original structure. A converted loft or a builder-added dormer can have lead work that looks acceptable from the ground but has not been dressed tightly enough to the structure to keep water out long term.
Lead is also used at the edges of flat roofs as an upstand and drip edge, and at the junction where a flat roof meets a vertical wall. These areas are often the first to fail on an older flat roof, even when the main waterproof membrane is still sound. Replacing just the lead detail at the perimeter of a flat roof is significantly cheaper than re-covering the whole roof, so it is worth having the detail inspected separately before assuming the whole roof needs replacing.
When a lead flashing is done correctly, it should lie flat and tight against both surfaces it bridges. There should be no gaps visible between the lead and the masonry, and the top edge should be neatly pointed. The lead itself should not be wrinkled or buckled, which is a sign of poor dressing. Properly dressed lead has a neat, close fit with clean folds at corners rather than rough cuts or overlapping patches.
Lead soakers are small pieces of lead that sit under each slate or tile along a wall junction. They are invisible once the tiles are laid but are essential for keeping water out at abutments. If a roofer quotes for flashing only and does not mention soakers at an abutment joint, it is worth asking whether soakers are included, because a flashing without soakers at a tiled abutment will not be watertight.
Ask any roofer quoting for lead work what code of lead they intend to use and show you the British Standard for the application. Code 4 is the minimum for most flashings. Code 5 is appropriate for valley gutters and flat surfaces with significant water flow. Heavier codes last longer and are less prone to fatigue cracking.
Lead work costs more than some roofing jobs because the material itself is expensive and the skill required to dress it correctly takes time to develop. The following ranges are typical for the UK at the time of writing. Actual quotes will vary depending on access, chimney or dormer size, roof pitch and the extent of any structural repairs needed at the same time.
These are broad honest ranges rather than fixed prices. The main factors that push costs up are difficult access (scaffolding adds £500 to £1,500 or more depending on the situation), a large or complex chimney stack, hard or interlocking tiles that are harder to lift without damage, and the need for structural repairs to timbers or masonry beneath the lead before the new lead can be fitted.
Access is the single biggest variable. A chimney on a single-storey extension may be accessible from a ladder with a roof ladder, while the same chimney in a different position on a three-storey house may require a full scaffold. Scaffolding is a significant additional cost and is sometimes shared across jobs if other work on the roof is done at the same time, so it is worth considering whether any other roof repairs are due.
The lead code specified matters. Code 5 lead costs more per kilogram than Code 4, and heavier lead is required for valleys and flat areas. A heavy Code 5 valley gutter will cost more in materials than a Code 4 chimney flashing of the same length.
Tile type affects the labour cost of valley and abutment work. Plain clay or concrete interlocking tiles are harder to lift without damage than traditional clay plain tiles or natural slate. If tiles break during stripping, replacements need to be sourced, which adds cost and sometimes delays the job if the tile is an older profile that is no longer manufactured.
Underlying structural damage adds cost. Lead failures that have been left for several years can allow water into roof timbers and the masonry of chimney stacks. Rotten timber has to be cut out and replaced before the new lead is dressed. Spalled or crumbling masonry on a chimney stack may need repointing or brick replacement before the lead can be fitted correctly. These repairs are separate from the lead work itself but are sometimes not apparent until the old lead is stripped back.
The number of separate pieces required also affects labour time. A chimney with a complicated shape, a chimney on a hip or behind a dormer, or a valley with an awkward junction at the top adds dressing time compared to a straightforward gable chimney on a simple pitched roof.
Good access reduces cost significantly. A chimney over a flat-roof extension that is accessible from the extension roof cuts scaffold out of the equation entirely. If you already have scaffolding up for another purpose, that is the right time to have lead work inspected and repaired.
A partial repair rather than a full replacement is cheaper if the lead is in reasonable condition except for one failed section. A good roofer will tell you honestly whether a patch repair is appropriate or whether the whole flashing needs replacing. If only the pointing has failed but the lead is sound, repointing alone may restore the seal for a fraction of the cost of new lead.
Simpler chimney and roof geometry costs less. A single small chimney on a straightforward pitched roof with plain tiles is the most straightforward lead job. Multiple flashings, complex shapes and difficult tile profiles all add time and therefore cost.
To get an accurate quote for lead work, a roofer needs to see the flashing in question, not just be told about it. A quote given over the phone without an inspection is unlikely to be reliable because the variables (access, lead code needed, number of tiles to be lifted, condition of underlying masonry and timber) cannot be assessed without looking at the roof. Ask for a written breakdown that separates materials from labour and confirms the lead code being used.
If you are in Taverham or the surrounding area and notice a water stain near a chimney, dormer or roof valley, do not leave it through the winter. A small lead failure that lets in a modest amount of water during autumn rain can allow significant damage to roof timbers and ceilings by spring. Call us to arrange a roof survey so we can assess what the lead is doing and give you an honest view of what needs doing and what it will cost.
We are based in Aylsham and carry out lead work across a wide area that includes Taverham, Norwich and the wider Norfolk area. Lead work is a skilled part of roofing that takes time to get right on site, and we cut and dress every piece ourselves rather than using pre-formed sections that rarely fit as well as site-cut lead.
If you have a suspected lead failure on your roof in Taverham, call us directly to book a survey. We will tell you plainly what is wrong, what it will cost and what the alternatives are.
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