If you need lead flashing or lead valley work in Wimblington, choosing the right contractor is the decision that determines whether the repair lasts ten years or thirty.
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Lead work is the craft of cutting, shaping, and fixing sheet lead to seal the joints where your roof meets another surface. Chimneys, dormer windows, flat roof upstands, valleys between roof pitches, and parapet walls all rely on lead to shed water cleanly. When that lead fails - through cracking, lifting, or poor original fitting - water finds its way in at exactly the point you least want it to.
A properly fitted lead flashing is stepped into the mortar joints of a masonry chimney, folded tightly around the profile of a tile or slate, and finished so that it cannot be lifted by wind or pulled away by thermal movement. Lead expands and contracts with temperature changes, so the way it is fixed and how long each section runs both matter. Runs that are too long will buckle and crack over time, regardless of the quality of the lead itself.
The standard material for domestic roofing is code 4 or code 5 lead sheet, measured by thickness. Code 3 is too thin for most exposed flashings and will fail prematurely. A competent roofer will specify the right code for each location and explain why.
Most lead failures come down to one of four causes: the original installation was poor, the lead has simply reached the end of a long service life, mortar joints have cracked and no longer hold the stepped flashing in place, or the lead has been fixed with the wrong fixings and pulled away from the masonry.
Thermal cracking is a common problem on chimney flashings, particularly where a single continuous piece of lead has been used across a wide face. Lead moves with heat, and a run wider than about 1.5 metres will eventually crack through repeated expansion and contraction cycles. The repair is to cut out the cracked section and re-dress shorter individual pieces with proper joints between them.
Mortar failure in the step joints is another frequent issue, especially on older chimneys. The flashing is tucked into a raked-out mortar joint and then pointed over. If the mortar pointing deteriorates, the top edge of the flashing lifts and water runs straight in behind it. Temporary sealant fixes to this rarely last more than a season or two because the sealant cannot flex the way properly pointed mortar does.
In valleys between two roof pitches, lead can lift at the edges where it has not been correctly lapped or clipped. Debris then accumulates underneath, traps moisture, and accelerates the deterioration of both the lead and the timbers below it.
This is where most homeowners go wrong. A roof is out of sight and most people have no way to check whether work has been done correctly until a problem shows up months or years later. That makes the questions you ask before agreeing to any work more important than they would be for most trades.
Here is what to ask, and what the answers should tell you.
A roofer who knows their trade will answer this without hesitation and will give you a reason suited to your specific job. For chimney flashings on a typical house, code 4 or code 5 is standard. For a valley or a wide abutment, code 5 is more appropriate. If the answer is vague, or if the roofer says whatever is cheapest without any qualification, that is a warning sign.
The correct answer is no more than around 1.5 metres per section for most stepped and cover flashings. Longer runs will crack. If a roofer plans to use one piece across a whole chimney breast without joints, ask them to explain why, and compare that answer with the guidance from the Lead Sheet Association. A roofer who has not heard of section length limits is someone to avoid.
Stepped flashings should be tucked into raked mortar joints - not just surface-pointed - and then secured with lead wedges or similar before being pointed with an appropriate mortar or sealant. Clout nails through the face of the lead are not appropriate for a primary fixing on an exposed flashing. If the roofer describes a fixing method that sounds like shortcuts, it probably is.
Pointing over old mortar without raking out first is a repair that will fail quickly. The new mortar has nothing to key into. A proper job involves raking back the old joint to a depth of at least 25mm before repointing. Ask directly whether this is included in the price.
To dress new lead properly around a chimney or dormer, some tiles or slates will need to be lifted and re-fixed. Ask whether this is included in the quoted price or whether it will be an extra. A full chimney flashing job that does not touch a single surrounding tile is often a sign that the work is being done on top of rather than underneath the existing coverings.
This is not an unreasonable request. A roofer who regularly does lead work should be able to point you to a completed job nearby, or show you photographs with enough detail to see the stepped joints and the quality of the pointing. You do not need to inspect every job - you are looking for confidence and evidence, not a portfolio.
A written breakdown of what is and is not included protects both you and the roofer. It should state the type and code of lead, which areas are being flashed, whether mortar raking and repointing is included, and whether any tile or slate lifting is covered. Verbal agreements about what is included are hard to enforce if a dispute arises.
High-pressure tactics - someone calling at your door saying your chimney is dangerous and they can do the work right now - are a persistent problem in roofing. A legitimate roofer does not need to pressure you into an immediate decision. Take your time, get more than one opinion, and be suspicious of anyone who says the job cannot wait.
Unusually low prices sometimes reflect lead that is too thin, runs that are too long, or fixings that will not last. Lead sheet itself is not cheap, and a quote that seems significantly lower than others may mean the specification has been quietly downgraded. Ask what is different about the cheaper quote - sometimes there is a legitimate reason, but often there is not.
Vague descriptions of the work are another sign to be cautious. A quote that simply says "re-flash chimney" without specifying the code of lead, the number of pieces, or what happens to the existing mortar gives you no way to compare it fairly with other quotes or to check that the work has been done as agreed.
When lead work is done properly, you should be able to inspect certain things from the ground or from a safe vantage point. The lead should sit flush against the masonry with no lifted edges or gaps. The mortar pointing over the top of the stepped flashing should be neat, fully filled, and should not show cracks. In a valley, the lead should overlap the tiles or slates at the edges and run cleanly without wrinkles or humps that would impede water flow.
Inside the property, there should be no sign of new staining after the first few rainfalls. If a damp patch appears within weeks of a completed repair, it is reasonable to ask the roofer to inspect and explain. A new patch in a different location from the original problem may indicate a separate issue, but a patch in the same location is a sign the repair has not held.
Well-dressed lead flashing, done to the right specification with the right code of material, can last forty years or more without needing attention. Work that cuts corners typically shows problems within five to ten years.
Typical costs for chimney lead flashing work in this part of the country range from around £300 to £800 for a straightforward chimney on a standard house, depending on the size of the chimney stack, the complexity of the profile, and the extent of any mortar work needed. Larger or more complex stacks, or those where the surrounding tiles also need attention, will cost more.
Lead valleys are priced differently because the material run is longer. A valley on a typical semi-detached house might use three to five metres of lead and cost from around £400 upwards depending on the pitch of the roof and how accessible the valley is.
Dormer flashings vary considerably by dormer size and design. A simple flat-top dormer with a single front and two side flashings might cost from £350 to £600. A more complex dormer with cheeks, a sloped top, and junction flashings into a main roof will cost more.
These are general ranges for guidance only. Any roofer should be able to give you a specific figure once they have seen the job in person.
We carry out lead work across Wimblington and the surrounding area, including nearby towns such as March, and further afield to Downham Market, King's Lynn, Wisbech, and Ely. Our work covers chimney flashings, step and cover flashings at abutments, lead valleys, dormer flashings, parapet copings, and flat roof upstand flashings.
We cut and dress lead on site to fit the specific profile of your roof. We do not use pre-formed plastic or aluminium substitute products in place of lead where lead is the correct material for the job.
If you can see damp on an internal ceiling below a chimney or dormer, or if you can spot lifted or cracked flashing from ground level, call us to arrange a roof survey. We will inspect the affected area, tell you what needs doing and why, and give you a written breakdown of the work before anything is agreed.
Do not wait for a small leak to become a large one. Water ingress through failed flashing can travel along roof timbers before it appears as a damp patch, which means the visible damage is often not directly below the point of entry. Early attention to lead work is almost always cheaper than the remedial work that follows a sustained leak.
Call us to arrange a roof survey in Wimblington and get a clear, itemised quote for your lead work.
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