Chapter one
Lead flashings where roofs meet brick
Brick gables and chimney stacks around The Green put lead flashings on the front line, and a failed one soaks the wall beneath.
A roof on a brick house is a series of joins. Each chimney stack, gable wall and dormer cheek marks a point where the tiles stop and something else begins. The seal there is called a flashing, a band of lead pressed hard against the brickwork, with its lower edge resting on the tiles to shed rain away from the join. Around The Green, where Mid Sussex District Council records two-storey buildings of predominantly brick construction, those joins matter more than the slopes between them. A slipped tile is visible from the road. A flashing lifted at one end can leak right through a winter before a stain shows indoors.
At a glance
- Flashings seal roofs against brick walls and stacks
- A wet patch often appears far from the failed lead
- Code 4 lead suits general flashing work

1.1 Why the stain is in the wrong place
Water that gets behind a flashing seldom drops straight down. It creeps along the back of the lead, runs down a timber and appears in a ceiling a metre or two from the opening. So we begin at the stain, go up to the nearest join and work back along the water's route until we find where it entered. Photographs of that spot, taken on your roof, go into the paperwork alongside the quote, which makes the fault plain to anyone reading it.

1.2 Lead that lasts
Sheet lead comes in codes, and each code is a thickness: code 5 is thicker than code 4. Code 4 is the sheet most often chosen for general flashing, with heavier codes for bigger or more exposed roofs. MyJobQuote gives more than 80 years for lead flashing, a typical figure and no guarantee for any single roof, because the mortar joint it is tucked into tends to give way first. Often the sensible job is to rake out that joint, repoint it and tuck the sound lead back in, and we recommend exactly that when it is enough. Our lead roofing page covers the work in detail.
1.3 Stacks and scaffold
On a brick stack the flashing and the pointing sit side by side, so they tend to fail together. On a two-storey house a stack also means scaffold, which can swallow a large part of a modest job: MyBuilder puts a chimney scaffold at £400 to £900. When prices are compared, find out if VAT and scaffold are counted in each one. Where a stack has leant, or its brickwork has opened up, a rebuild is the better answer than yet another round of repointing, with photographs to back that advice.
Typical UK costs for lead and chimney work
- Lead patch repair£150 to £250
- Chimney lead replaced, no scaffold£350 to £460
- Chimney scaffold£400 to £900
- Chimney repointing£500 to £2,000
The figure that counts is the single total in your written quote after the survey, so ask whether it has VAT and scaffold inside. Source: MyJobQuote lead work guide, 22/09/26; MyBuilder chimney repair and scaffolding guides, updated 21/08/2026.





