Chimney Repairs South Wales › Bridgend › Guide
Plenty of Bridgend homes have a chimney that has not been used for years. Leaving it open lets rain and birds in. Sealing it completely can cause damp to build up inside. The usual answer is to cap the top and give the flue a way to breathe.
Why leave it open to the air at all
A flue that is shut at both ends holds still, damp air. That moisture can show up as staining on the chimney breast or a musty smell in the room. A small amount of air movement keeps the brickwork dry, which protects both the stack and the wall below it. This is especially true on older Bridgend terraces where the chimney breast sits against a cold outside wall.
What a cap does
A cap or cowl stops rain, birds and debris falling down the flue. Without one, water runs down the inside of the stack and soaks the breast, which is a common cause of damp patches. A good cap also takes strain off the pot and the cement bed around it. Rain that finds its way down an open flue can also bring soot and debris into the fireplace opening.
How ventilation is arranged
Ventilation can be at the top, through a vented cap, or at the bottom, through a vent in the room-side closure. The right choice depends on the room and the stack. We fit the top part. Anything at fireplace level is a matter for whoever closes the opening, and we are happy to advise. Whichever way it is arranged, the aim is the same: rain stays out and moist air has somewhere to go.
- A vented cap or cowl at the top of the stack
- A vent in the blocked-up fireplace opening
- Checking that the pot is firmly bedded
- Making sure the flue is not sealed solid in the middle
Signs it has been done wrongly
Damp staining on the breast, a musty smell, salts on the plaster or a stack with no cap are all hints that something is wrong. From the room, you can look for a missing vent and see whether paint is flaking. Please do not climb up to inspect the top. Call us and we will have a proper look. A damp, musty breast in a back bedroom is a frequent clue that a blocked flue has no air at all.
When we do it
Capping is often done alongside other stack work, such as renewing the flaunching or rebuilding the top courses. We quote it as part of the job and keep the scaffold time short. If it needs a closer look, a scaffold lets us see the pot, the cement and the brickwork properly.
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Common Questions
Is it better to cap or to seal a disused chimney?
Capping with ventilation is usually better. A fully sealed flue can trap damp air and cause staining inside. A vented cap keeps rain out while letting the flue breathe. We look at your stack and advise.
Will capping stop damp on my chimney breast?
It helps where rain coming down the flue is the cause, but damp can have other sources, such as the cap, the brickwork or the roof junction. We trace the cause before we recommend anything.
Can I cap the chimney myself from the roof?
We would not advise it. Working at height on a stack is dangerous, and a poorly fitted cap can fail. Call us and we will inspect it and fit a proper cap from a safe scaffold.
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