Lead Work in Dereham

How we handle lead work

Lead Work on Roofs in Dereham

Lead flashing is the strip of dressed metal that seals the joint between a roof surface and any vertical structure - a chimney stack, a parapet wall, a dormer, a skylight frame or a roof valley. When it fails, water works its way in silently, often pooling inside a wall or ceiling void before you spot any visible damage. Lead work is one of the most common sources of roof leaks, and it is almost always repairable without replacing the whole roof.

Where Lead Work Is Used and Why It Matters

Lead has been used on British roofs for centuries because it is malleable, long-lasting and able to move with thermal expansion without cracking. A correctly installed lead flashing, stepped into the mortar joints of a chimney and lapped onto the roof tiles, will typically outlast the tiles themselves. The most vulnerable spots on any pitched roof are:

• Chimney flashings - the back gutter, side stepped flashings and the apron at the front
• Abutment flashings where a lean-to or extension roof meets a house wall
• Valley gutters between two roof pitches
• Dormer cheeks and dormer window heads
• Verge and parapet cappings on flat or low-pitched roofs

Each of these details requires lead to be cut and dressed to the correct profile, fixed with lead clips or tacks, and pointed with mortar or sealed with a specialist sealant. A bodged repair - lead wedged with cement or covered with flash band tape - will fail within a few seasons. The underlying problem is almost always that the flashing has lifted, cracked at a fold point, or the mortar pointing holding it into the brickwork has eroded.

What the Work Actually Involves

Good lead work starts with removing the old flashing completely. Raking out the mortar joints in the brick or stonework, cutting fresh lead to the correct code (Code 4 is standard for most stepped and cover flashings; Code 5 or 6 for back gutters and valley work), and dressing it neatly before fixing and pointing. Cutting corners by simply re-pointing over old failed lead is a short-term fix that causes longer-term water damage.

For chimney stacks in particular, the full sequence involves a soaker or back gutter at the high side of the stack, two runs of stepped flashing on the sides lapped into the mortar courses, and a front apron over the tiles below. Each piece overlaps the next by a set amount to shed water clear of the junction. On older properties in Dereham, the original lead is often in good condition but the mortar pointing has simply given way after decades of freeze-thaw cycles. In those cases, the lead can sometimes be re-used after cleaning and re-dressing, saving material cost.

Valley gutters are a heavier job. A lead valley on a traditional pitched roof needs to be laid in manageable lengths - typically no more than 1.5 metres per length - with welted joints to allow for thermal movement. Too long a single piece and the lead will split over time. The tiles or slates either side are cut to a true line and bedded so water runs cleanly into the valley and away to the gutter.

Why Professional Lead Work Matters

Lead is a heavy, controlled material and working at roof height with it carries real risk. Beyond the safety aspect, poorly dressed lead is the primary cause of callbacks on roofing jobs. The fold angles, the lap distances, the fixing method and the pointing all need to be right first time - because mistakes are hidden inside the roof structure and may not show up as a leak until months later, by which point plaster, timbers or insulation can be affected.

Some roofers patch failed flashings with self-adhesive tape products as a stopgap. These can buy time in an emergency but they are not a permanent repair and should not be left in place long-term. A proper lead replacement done correctly removes the cause of the problem rather than masking it.

What to Expect When We Carry Out Lead Work

We will look at the full junction, not just the section that is visibly damaged. A leaking chimney flashing on one side often means the opposite side is close to failure too. We will tell you what we find and explain what needs doing before any work starts. A full valley replacement on a standard semi-detached takes longer and may require scaffolding if safe ladder access is not possible from the eaves.

Once the lead is dressed and fixed, we point the mortar joints using a mix appropriate to the age of the brickwork. On older properties with soft lime mortar joints, a lime-based pointing is often more suitable than hard sand and cement, which can cause the surrounding bricks to spall. We clear all debris from gutters and the roof surface before we leave.

Lead Work Costs in Dereham

Lead flashing repairs and replacements in Dereham typically cost between £150 and £600 for chimney flashings depending on the size of the stack and the number of faces involved. A full lead valley replacement on a standard house roof generally falls in the range of £400 to £900, with cost varying according to the length of the valley and ease of access. These are typical current UK figures for like-for-like lead work using correct code lead; prices for jobs involving scaffolding, awkward access or larger commercial stacks will be higher.

Lead itself is a traded commodity and its price fluctuates, so any quote we give is based on the lead price at the time of the job. It is worth asking any roofer quoting for lead work to confirm what code lead they are using - the code number refers to the thickness and weight, and using an underweight lead to cut costs is a common reason flashings fail early.

Lead Work Across Dereham and Nearby Villages

Once a flashing lifts, damp can travel a long way through a wall cavity before it becomes obvious inside the house.

If you have noticed damp patches appearing on a chimney breast, water marks on a ceiling near a roof junction, or you can see from the ground that flashing has pulled away from the brickwork, call us for a roof inspection and we will tell you honestly what is needed.

Frequently Asked Questions About Lead Work