Chimney Repairs South Wales › Neath › Guide
Damp beside a chimney breast catches many Neath homeowners out, because the cause is often above the roof, not in the room. Rain finds its way into the stack, runs down the brickwork and appears as a stain on the wall. Here is what causes it and how we trace it.
Why the stack is so often to blame
A chimney is a tall column of brick standing in the weather. Neath's valley rain drives against it from the side and drips down from the top, and old pointing, cracked pots and tired flaunching all let that water in. Once it is inside the stack, gravity takes it down the breast. The patch you see may be some way below the point where the water actually got in.
Common causes we find
Most damp patches trace back to a short list of faults. Some sit at the top of the stack, and some are at the roof junction or inside the flue itself. Salts brought out by the damp can leave white or brown staining, and soot can bleed through plaster where an old flue is wet. That staining is a clue we use when working out where the water is getting in.
- Cracked or missing flaunching around the pots
- Unused flue left open at the top with no cap
- Failed pointing or spalled brick high on the stack
- Cracked or loose pots letting rain in
- A leak at the roof junction, which has its own page
What we check from the ground, loft and room
From the ground we look at the stack top, the pots and the general state of the brickwork. In the loft we check the stack for wet patches, dark staining and drips, especially after rain. In the room, we look at where the damp sits, whether it follows the breast, and whether it gets worse in wet weather only. Please leave the roof to us and call for a proper look.
What the repair involves
If the top is at fault, we renew the flaunching, re-bed or replace pots and cap any flue that is not used. Failed brick or mortar is repaired, or the upper courses are rebuilt where they have gone. Once the water is stopped, the wall needs time to dry before you redecorate. Fresh plaster or paint over a wet wall will fail, so we advise you to wait until it is dry.
When it is not the chimney
Not every patch comes from the stack. Condensation, a leaking gutter or pipe, or rising damp in the breast can look similar. We rule out the chimney first because it is the most common cause. If we find the stack is sound, we say so and point you towards the next thing to check, rather than charging for work you do not need.
Need a chimney looked at in Neath? See chimney repairs in Neath, or for the lead and mortar side of it, chimney flashing repairs and chimney repointing and repairs.
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Common Questions
Does a damp chimney breast always mean a leak in the stack?
No, but it is the first thing to check. Gutters, pipes, condensation and rising damp can look similar. We start by checking the stack and the loft, then tell you honestly if the cause is somewhere else.
Why does the damp only show after heavy rain?
That usually points to water entering at the top or at the roof junction. After dry weather the brick dries out, then the next wet spell soaks it again. Patches that come and go are a common sign of a leaking stack.
Should I light the fire to dry the wall out?
No. If there is any fault in the stack or flue, do not light or use it until it has been looked at. Heat on a damp or damaged flue can make things worse. Call us for a proper look first.
Get a Chimney Looked At in Neath
Tell us what the roof is doing in Neath and we will look at it. Call 07766 547309, message us on WhatsApp or use the form below.