Lead is the traditional material for flashings, valleys and chimney work on Norfolk roofs, and it needs skilled hands to get right. We cut, dress and fit lead to the correct code weight for each application, stopping leaks at the joints where they most commonly start. Whether it is a period property in Fakenham or a rural farmhouse near Thursford, we carry out lead work properly from the outset.
Photo from one of our recent jobs
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Lead is one of the oldest roofing materials in continuous use, and for good reason. Dressed and fitted correctly it outlasts almost every other flashing material by decades. It is malleable enough to follow complex shapes around chimney stacks, dormers and abutments, yet durable enough to handle the frost, driving rain and coastal wind that North Norfolk roofs are regularly exposed to. If you have a leak near a chimney, a valley or a roof-to-wall junction, failed or poorly fitted lead is a common cause.
Lead turns up in several places on a typical Fakenham property, and each application has its own requirements. The most frequent is flashings: the strips of lead that seal the joint between a roof slope and a vertical surface such as a chimney breast, a parapet wall or a dormer cheek. Step flashings and soakers work together on tiled roofs to direct water away from these junctions without relying on mortar alone.
Valley gutters are another common application. Flat roofs on bay windows, porches and garage roofs often carry a lead weathering detail at the wall junction. Chimney back gutters, also known as saddles, collect water behind the stack and need to be correctly sized and fixed or they pond and eventually fail.
Lead sheet is graded by thickness and sold as code weights from Code 3 through to Code 8. Using the wrong code is one of the most common causes of premature failure. Code 3 and Code 4 are too light for flashings exposed to wind uplift and are only appropriate for small soakers and protected details. Chimney flashings should generally be Code 4 or Code 5. Valley gutters typically require Code 5 or heavier depending on the span and the pitch of the adjoining slopes.
On listed buildings and properties within conservation areas, the specification matters even more. Planning authorities in North Norfolk often require like-for-like replacement on historic buildings, so using an undersized or substitute material is not simply a quality issue, it can create problems with consents.
Lead work does not last forever. A common problem is that older lead has been worked too hard over the years, developing cracks or splits through thermal movement. Lead expands and contracts significantly with temperature changes, and if it has been fixed too rigidly or laid in excessively long runs without the correct expansion details, it will tear at fixings or split along the face. Patching split lead with mortar is a short-term fix that rarely lasts more than a season or two.
Mortar fillets are another frequent source of trouble. Mortar has no flexibility, so it cracks as the building moves and as frost gets into the joint in winter. Once cracked, it lets water track straight into the roof structure. Replacing a mortar fillet with properly lapped lead flashings is a lasting repair rather than a repeated one.
On pantile roofs, soakers need to be cut to suit the profile of the tile. A standard flat soaker will not seal correctly against a pantile, so attention to detail during cutting and laying matters. Similarly, rural properties frequently have large chimney stacks with complex back gutter arrangements that need careful dressing to avoid ponding.
Historic properties often require a more considered approach to lead work. Original details should be surveyed before any lead is removed, so the replacement matches the historic arrangement. Where a building is listed, it is always worth checking with the local authority whether listed building consent is needed before carrying out lead work, particularly if the detail involves chimneys or significant roof sections visible from the street.
Lead theft is also a real issue for churches, older public buildings and some rural properties. If lead has been stolen and needs replacing, the same code and detailing standards apply, and some owners choose to supplement lead with a security fixing system. We can advise on the options based on the specific situation.
Before any lead is cut or fitted, we assess the existing detail carefully. On a chimney, that means checking the stack itself for loose pointing or spalled brickwork, because there is no point fitting new flashings to a chimney that needs repointing underneath them. On a valley, we check the valley boards and the adjacent tile courses for damage before stripping the old lead.
Lead is cut on site to suit the exact dimensions required. Flashings are dressed into the mortar joint of the brickwork and wedged with lead wedges, then pointed with a flexible pointing mortar suitable for the movement involved. Soakers are cut to the gauge of the tile course and fitted as each tile course is laid. Valley gutters are laid with proper drips and roll details to allow thermal movement without the lead splitting.
On completion, the lead surface is treated with patination oil to prevent the white carbonate bloom that can develop on new lead and stain tiles or brickwork below. Surrounding tiles and mortar joints disturbed during the work are made good before we leave the site.
Lead work is priced by the complexity of the detail and the amount of lead required rather than a simple per-metre rate. A straightforward chimney flashing replacement on a standard semi-detached property typically costs in the region of £300 to £600 depending on the number of pieces and access. A full lead valley replacement on a larger period property will cost more, often £500 to £1,200 or above, reflecting the weight of lead involved and the time needed to strip, board and relay correctly. These figures are typical for North Norfolk and reflect the cost of lead at current merchant prices, which can vary.
Lead flashings on a chimney or at a roof abutment, fitted correctly to the right code weight, should last 50 years or more under normal conditions. That longevity is why lead remains the material of choice on period properties and wherever a lasting repair matters more than the lowest initial cost.
We carry out lead work across Fakenham and the villages nearby, including Hempton, Sculthorpe, East Raynham and Thursford, the market town of Holt, the seaside town of Wells-next-the-Sea and further into the North Norfolk countryside. Whether it is a straightforward flashing repair or a more involved job on a period farmhouse, we are happy to come and look at what is needed before any work is agreed.
If you can see daylight around a chimney flashing, notice water marks on a chimney breast inside the house, or have been told by a surveyor that the lead work is at the end of its life, call us to arrange a look. We will tell you what needs doing and what can wait.
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