Chimney Repairs in Malahide
A chimney stack passes through the roof, stands exposed above it and has several junctions where water can get in. Emerald Isle Roofers Dublin repairs chimneys for properties in Malahide from our base in Blanchardstown. We look at the stack, its junction with the roof and its top before deciding which part needs attention.
If masonry, a pot or flashing looks loose, keep people away from the area below. Do not go onto the roof or lean out of a window to inspect the stack.
Materials and work covered
Chimney work includes flashing in lead or another appropriate material, repointing in cement or lime mortar as the masonry requires, renewing flaunching around pots, capping unused flues where appropriate and rebuilding stacks that are no longer sound. The material and method are chosen after the stack has been assessed.
Associated roof repairs around the stack, such as slates or tiles disturbed at the junction, are identified and listed so the whole route water may be taking is dealt with.
Where water gets into a chimney
Water can enter at the flashing where the stack meets the roof, through porous or open joints in the brickwork or render, through cracked flaunching at the top, or down an open flue. Each produces different symptoms indoors, and more than one may be present.
A stain on a chimney breast does not always mean the chimney is at fault; the roof covering beside it can be the source. Note where the damp appears and whether it follows heavy or wind-driven rain when you enquire.
To compare the two kinds of leak, read is it the chimney or the roof.
Flashing in lead or an appropriate alternative
Lead has long been used to flash chimneys because it can be shaped to the junction. Alternative flashing materials exist and may be appropriate in some situations. Whichever is used, it has to be detailed correctly where it meets the masonry and the roof covering.
Flashing that has lifted, split or pulled out of its joint is a common cause of leaks. Repair or replacement depends on its condition; the quotation should say which material is proposed and why.
For why junctions fail, read roof flashing failure causes.
Choosing cement or lime mortar for pointing
Mortar joints wear and open up over time. Repointing replaces failed mortar with new, but the mortar type matters. Some chimneys, often older ones, were built with lime mortar, which is softer and more breathable; others suit cement-based mortar.
Using a mortar that is incompatible with the masonry can trap moisture or damage the bricks or stone. The existing construction is assessed before a mortar is chosen.
Flaunching, pots and capping
Flaunching is the mortar collar at the top of the stack that holds pots and sheds water. When it cracks, water can enter the masonry and pots can loosen. Renewing flaunching can deal with both.
Unused flues are sometimes capped to reduce water entry, but ventilation of the flue should be considered. If a flue is still in use, do not cap it; any work around an active flue needs to suit its use.
Repair or rebuild
Most chimney problems are repairable. Rebuilding is considered when a stack is leaning, the masonry is badly deteriorated through its depth or repairs would not leave it sound. A partial rebuild above the roofline is sometimes enough.
The quotation should explain why rebuilding is or is not recommended, how far down any rebuild goes, and how the flashing and roof junction will be reinstated.
For other common causes, read common causes of chimney leaks.
Chimney repair enquiries from Malahide
We serve Malahide from Blanchardstown. Tell us what you have noticed, such as damp on a chimney breast, debris falling or visible cracking from the ground, and whether the fireplace or flue is in use. Safe ground-level photographs help but are optional.
Chimney work usually needs scaffolding or other safe access, which forms part of the scope. Price follows the assessed scope rather than a description alone.
Frequently asked questions
Is lead the only option for chimney flashing?
No. Lead is common, but appropriate alternatives exist. The choice depends on the junction and the roof covering, and the quotation should name the material proposed.
Should my chimney be repointed in lime or cement?
It depends on how the chimney was built. Older masonry may need lime mortar; other stacks suit cement. The existing construction is assessed before deciding.
Can an unused chimney be capped?
Often, yes, but flue ventilation should be considered. A flue that is still in use should not be capped.
Does a damp chimney breast always mean the chimney is leaking?
Not always. The roof covering beside the stack, condensation in the flue or other causes can produce similar marks. The assessment checks the stack and adjoining roof together.
When does a chimney need rebuilding?
When the stack leans, the masonry is badly deteriorated through its depth or repairs would not leave it sound. Most chimney problems are repairable without rebuilding.
For the full Dublin service, see our chimney repair service.
For roof covering and other work at the property, see roofing services in Malahide.
Request a Roofing Quote for Chimney Repairs in Malahide
Send Emerald Isle Roofers Dublin your details and a short description of the work required.
Emergency roofing: 083 158 8431