Chimney Repairs Dublin — Repointing, Rebuilds & Leadwork

Every other part of your roof has something protecting it. The chimney doesn't — it stands up above the ridge line, takes the wind and rain first, and gets checked last, usually only when something's already gone wrong.

Dublin makes this worse than most cities. A huge share of the housing stock — the terraces of Rathmines, Phibsborough, Ranelagh, Drumcondra — has original Georgian or Victorian brick chimney stacks, often carrying two, three, even four flue pots on the one stack, sometimes shared across a party wall between two houses. That's over a century of frost, rain, and settling brickwork on structures that were never built with modern materials in mind — which matters more than most repair companies let on.

Mr Roofing handles the full range of chimney work — repointing, flashing, flaunching, pot replacement, cracked or leaning stacks, full rebuilds. Free inspection, 25-year guarantee, and we'll always tell you honestly whether you need a repair or a rebuild, not just quote the bigger job because it's the bigger job.

Repointing

Cracked or crumbling mortar between the bricks, redone properly — with the right mortar mix for the age of the chimney, not just whatever's on the van (more on why that matters below).

Flashing Repairs

The lead seal where the chimney meets the roof — the single most common source of a "chimney leak" that isn't actually the chimney at all.

Flaunching

The mortar collar around the base of the flue pots, keeping rain from running straight down inside the flue. Cracked flaunching is one of the most overlooked, easiest-to-miss chimney problems there is.

Pot Replacement

Cracked, chipped, or missing chimney pots — replaced and matched to the stack, no odd one out standing above your roofline.

Chimney Stack Repairs

Leaning, bulging, or cracked stacks assessed properly before anything's touched — because a chimney that's structurally moving needs a different answer than one that just needs repointing.

Full Rebuilds

Where a stack's too far gone to save safely, we rebuild it to match the original — same brick pattern, same profile, same number of pots.

Cement repointing on a lime-mortar chimney does more harm than good.

This is the one nobody tells you. Most chimneys built before the 1920s — which is most of Dublin's period housing stock — were built with lime mortar, not cement. Lime mortar is slightly flexible and lets moisture pass through and evaporate out. Modern cement mortar doesn't do either of those things.

When a chimney gets repointed with cement because it's cheaper and faster, the mortar traps moisture inside the brick instead of letting it breathe — and the brick itself, being softer than the cement around it, starts to crumble and spall from the inside out. You end up with a chimney that looks freshly repointed and is actually failing faster than before the "repair." We match mortar to the age and type of the chimney, not just to whatever's quickest.

Flaunching cracks quietly, and nobody looks up to check it.

The flaunching around the base of your pots is doing more work than it gets credit for — it's the seal stopping rain running straight down inside the flue. It cracks with age and weather movement, and because it's small and at the very top of the chimney, it's the last thing anyone thinks to check. A cracked flaunch left alone for a couple of winters can mean water sitting inside the flue itself, which is a much bigger problem than the flaunch ever was.

Shared party-wall chimneys mean shared problems.

A lot of Dublin terraces have a single chimney stack straddling the party wall between two houses, each side with its own flue and pot. If your neighbour's flashing or flaunching has failed, water can track through the shared stack and show up as damp on your side — even though nothing's technically wrong with your half. This is a genuinely common, genuinely confusing situation, and it's worth knowing about before you start looking for a leak that isn't where you think it is.

A leaning stack isn't automatically a rebuild — but it needs a real look, not a guess.

Chimneys can lean slightly over decades without being dangerous, and they can also lean because the mortar's failed structurally and it needs to come down before it falls. Telling the difference from the ground is genuinely not possible — this is exactly the kind of call that needs someone up there, not someone squinting from the garden.