The short answer
Lead is a toxic metal, but a sound lead roof overhead poses little risk to the people living under it. The risk comes from swallowing lead or breathing its dust and fume, which happens when old lead is cut, burnt, scraped or dropped as waste. Keep children and pets away from work areas, wash hands after handling, and expect a roofer to contain debris and clean up properly.
Where the risk actually sits
Lead is a toxic metal that the body does not use and cannot easily get rid of. That sounds alarming, but the way it harms people matters. Harm follows from taking lead into the body, either by swallowing it or by breathing in fine dust or fume. Touching a sheet of lead on a roof, or living beneath one, is a very different thing.
Sheet lead is stable. Over the years its surface turns into a dull grey-white layer of lead carbonate, sometimes called patina, which protects the metal underneath. That layer is the reason a lead roof can stay watertight for generations. It is also the layer that comes away as a fine, pale powder when old lead is scraped or scrubbed hard, and that powder is what deserves respect.
So the useful question is not whether lead is on your roof. It is whether anything is going to break the metal up, heat it or spread it about. Left alone and sealed under the sky, a lead gutter or flashing is doing its job. The moment it is cut, welded, burnt off or thrown into a skip, the handling matters, and the person doing the work carries the responsibility for managing it.
Handling lead during repairs
Lead work generates three things worth controlling: offcuts, dust and fume. Offcuts are heavy, soft and easy to pick up, so the rule is to keep them off the ground where children play and to bag them or move them to a covered container as the work proceeds. Dust arises when old lead is scraped, brushed or rubbed down, and a good roofer works damp, uses a vacuum rather than a brush on the roof and the ground below, and does not leave powdery debris to blow about.
Fume is the hazard that comes from heat. Traditional lead welding, also called lead burning, melts the edges of two sheets with a gas flame so they fuse. Used properly it makes sound joints, and lead welding has its own page that sets out when it is chosen. It also means working with molten metal, which is why it belongs to someone trained and why a heat source should never be aimed at old lead paint or at lead you cannot identify.
For you, the practical points are simple. Stay out of the work area. Keep windows below the work closed while it is under way. Ask that tools are cleaned and that the ground, gutters and any scaffold are tidied before the site is handed back. A roofer who works tidily protects their own health and yours at the same time.
Run-off, gutters and the garden
Rain runs over lead on its way to the gutter and takes a trace of the surface with it. For most homes this is of no practical concern, because the water goes to a downpipe and then to a drain. It becomes a question where rainwater from a lead roof is stored and used, for example in a water butt for watering vegetables, or caught for any other use that might end up in food or drink.
If you collect water from a lead roof, take advice before using it on edible crops or anywhere it could reach drinking water. A simple and sensible approach is to use it only on ornamental planting, or to fit the butt to a different roof, such as a shed or garage with a plain covering.
Lead lying in an open gutter also collects leaf litter and soil. When that debris is cleared, it should be bagged and disposed of rather than shovelled onto a flowerbed. Our page on clearing parapet gutters describes how that debris is lifted out, which is worth reading before any hidden gutter is cleaned.
Old lead paint and old lead pipes
Not all lead around a house is roof sheet. Older buildings may have lead in old paint layers on fascias, window frames or railings, and some have lead service pipes. These are not the same as the sheet on your roof, but they are often discussed together, and they matter for different reasons.
Old paint is the one that catches people out on a roofing job. If a fascia, bargeboard or decorative timber near the roof has several coats of old paint, rubbing it down by machine can throw fine paint dust over a large area. If you think paint on your house might contain lead, tell the person quoting before the work is priced, so it can be dealt with by damp rubbing, careful stripping or covering over rather than dry sanding.
A chimney flashing or a lead-lined parapet gutter is rarely painted, so for a lead roofer the concern is mostly the waste and the dust described above. If the building is occupied by a young child or someone pregnant, mention it when the work is planned. It does not change whether the work can be done, but it does change how tidy the site needs to be kept. For a deeper look at what the work costs, see our guide to leadwork costs.
Does lead theft or removal change anything?
When lead has been stolen, the risk to health is nil, but the risk to the building is real: open joints, exposed timber and wet ceilings. The remedy is a new run of sheet and, in many cases, a second look at what covers the old lead, which is covered on our page about lead theft from roofs.
When we take old lead off, it is rolled, stacked and removed from site as part of clearing up. Used lead is valuable scrap, which is one reason the handling is straightforward: it is wanted, and it is not left lying about.
If you want a view on your own lead, the survey costs nothing, comes with pictures of the roof itself, and leads to a written fixed quote. It sits within our wider lead roofing work for Bath and the towns around it. If anything on the roof needs particular care because of where it is, or who lives below, say so at the survey and it will go into the plan for the job. For a lead roof in good condition, the health advice is easy: leave it alone, keep it clear of debris, and have it handled properly if it ever has to be cut or lifted.
