Lead: from the parish to the roof
A parish with lead in its history still depends on the metal for the places where water is hardest to stop.
Chewton Mendip's parish once held several lead mines. The metal that came out of them has a second life on roofs, where it does the jobs no tile or slate can do. A roof is a series of overlaps, and overlaps are only waterproof while water runs downhill across them. At every junction with masonry, a dormer cheek or a neighbouring slope, the overlap has to be completed with something that bends to fit, and sheet lead is the traditional choice.
Lead lasts, but it has habits. It expands and contracts more than most roofing materials, so a long, rigidly fixed sheet will crack along the line where it was held in place. Good leadwork is laid in short bays, with joints designed to let the metal slide: rolls over a timber core, drips (small steps) that carry water to the next level, and welts folded into the edges. The specification is expressed as a lead code, the grade number that sets the thickness, and it is chosen to suit the position. We do not publish thickness tables, because the right choice comes from the detail on your roof.
The faults we meet are rarely the metal's alone. A splitting flashing is usually a laying problem, with a bay too long, a clip in the wrong place or an edge hammered flat so it cannot move. Patch repairs have a place on a small split, and a neat patch can buy years, but a long run of cracked lead with the same fault repeating along it usually wants relaying properly.
A MyJobQuote guide from September 2026 reckons a patch of lead at a chimney at about £150 to £250, with whole chimney leadwork averaging around £570 and costing more once scaffold is involved. A flat lead roof is a larger undertaking, quoted per square metre. These are national figures, not our prices; our fixed quote arrives only after we have climbed up and inspected. The detail on laying and repair is on our lead roofing page.
Words you will hear
- Flashing
- Strip metal, usually lead, dressed over the gap where roof meets chimney or masonry.
- Drip
- A shallow step built into a lead gutter, handing water down to the next level.
- Roll
- A raised, rounded joint between two lead sheets, formed over a wooden batten.
- Lead code
- The grade number that gives the sheet its thickness.



