Lead is still the most reliable material for sealing the joints and penetrations on a roof. We carry out leadwork repairs and replacements on chimney flashings, valleys, parapet walls and flat roof upstands across Ely and the surrounding area.
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When lead work on your roof needs replacing or a new installation is planned, you will likely come across terms like code 3, code 4, code 5, EPDM strip and lead alternatives. It is worth understanding what these mean before work starts so you can make an informed decision and ask the right questions. This page sets out the main options honestly, including where each one works well and where it falls short.
Roofing lead sheet is milled from pure lead and graded by thickness, expressed as a code number. The higher the code, the thicker and heavier the sheet. For residential flashing work, the two grades you will encounter most are code 4 and code 5.
Lead work should use code 4 or code 5 sheet, as appropriate to the location and detail, dressed and fixed to British Standard. Using the correct code for the application is not optional - it is what determines how long the work lasts.
Several alternative flashing materials are sold as easier to fit or longer lasting than lead. They deserve an honest assessment rather than a blanket endorsement or dismissal.
Zinc. A traditional alternative with a long track record, particularly in northern European building. Zinc flashings are light, clean-looking and durable. The material is less ductile than lead, which means it is harder to dress into tight shapes, and in the wrong conditions (particularly where it contacts wet timber without proper separation) it can corrode. For straightforward details on compatible roof types, zinc is a reasonable option. For complex chimney work with multiple bends, lead remains easier to work accurately on site.
Copper. Extremely durable and traditional on heritage and listed buildings. Copper is expensive - roughly two to three times the material cost of code 4 lead - and weathers to a distinctive green patina that some homeowners like and others do not. It is rarely specified on ordinary residential work for cost reasons alone.
Lead-effect or self-adhesive flashing tape. Products such as self-adhesive bitumen-backed metal tape are sold as a DIY or budget repair option. They can hold a minor leak for a season or two but are not a permanent solution. They are not a substitute for properly dressed and fixed lead sheet. Adhesive tapes are also prone to lifting in heat and delaminating from dusty or damp substrates. If you see them on a roof you are buying or have inherited, treat them as a temporary patch and plan to replace the lead properly.
EPDM rubber strip. EPDM (ethylene propylene diene monomer) is primarily used as a flat roof membrane, but EPDM-backed flashing strip is also available. It bonds well to most surfaces and is flexible. For simple abutment details on flat or low-pitch roofs it performs well. It is less suited to complex three-dimensional shapes such as chimney soakers and step flashings, where lead's malleability gives it a clear practical advantage.
Despite the alternatives available, lead sheet remains the most widely used and specified material for residential flashing in the UK. The reasons are practical rather than traditional:
The main disadvantages of lead are its weight (which matters on some substrates), its cost relative to tape or code 3 alternatives, and the fact that it has some theft value - a minor consideration but worth being aware of on more exposed or accessible properties.
Lead flashing on a chimney or abutment is not a single piece of metal. It is a system of interlocking components, each with a specific job. Getting these components right matters more than the grade of lead used.
Soakers are individual pieces of lead, one per tile course, that slot between the tiles and the wall at a pitched abutment. They are invisible once the tiles are relaid. Their job is to direct water outward from the wall onto the tile surface below. Without soakers, water runs straight down the wall-tile joint.
Step flashings are the visible pieces of lead you see in a stepped pattern against a chimney or side wall. They overlap the soakers and are fixed into the mortar joints of the brickwork. Together, soakers and step flashings work as a system - one without the other is not a complete detail.
Cover flashings (also called cap flashings) overlap the top of an upstand or apron and are wedged into a cut mortar joint (the raggle) and pointed in. They can be replaced independently of the base flashing below, which makes maintenance easier.
Back gutters sit behind the high side of a chimney stack and collect water that runs down the stack. A well-formed back gutter with an adequate fall and correct lead code (usually code 5 for the gutter itself) is critical - a poorly formed one fills with debris and backs up in heavy rain.
When getting a lead work job priced in Haddenham or nearby, ask specifically which code of lead will be used and why. Ask whether soakers are included where there is a pitched abutment - some quotes leave them out and rely on stepped flashing alone, which is not best practice. Ask whether the raggle will be repointed as part of the job, and what will happen to the tiles or slates that are lifted to fit soakers.
A fair price for chimney flashing on a standard residential property in the UK typically runs from around £300 to £900 depending on the size of the stack, the number of components and the access required. Valley work varies more widely. These figures cover labour and material but not scaffolding, which is priced separately where needed.
To discuss lead work options for your property in Haddenham, call Ely Roofers for a roof survey. We also cover Ely and the surrounding area.
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