Why do birds nest in chimneys?

When building a nest, birds will often look for an area that’s safe, quiet and hidden from predators. Chimneys offer all of the above, with the added benefit of being largely unaffected by the weather. Chimneys are also thought to be better nesting grounds than trees, mainly because birds do not have to fight over territory. The most common birds that nest in chimneys in our area are Jackdaws and Pigeons.

 

How do I know if a bird is nesting in my chimney?

The first sign that you have a bird in the chimney flue is the presence of a few twigs, or other non-chimney materials dropping down into your fireplace. This is the stage in which you should give Lewis your local chimney sweep a call on 07542 071 659.

Alternatively, you may notice birds flying back and forth around your chimney pot. If you normally hear pigeons cooing or traffic noise and then the sounds stop there might be an obstruction in the flue. A fly infestation is often a sign of a collapsed nest or a dead bird in the chimney.

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What to do next?

If you think you have a birds' nest in your chimney – DO NOT light a fire.  This might seem obvious, but some people try to burn the nest out.  You run the risk of setting fire or filling the whole house with smoke.

From the end of August through to March a sweep can remove the nest – this involves specialist equipment and can be quite time consuming depending on the size and material.  A CCTV inspection is carried out to ensure that all the debris has been cleared.  Finally, a smoke test is performed to confirm the correct draw is available to the fire.  A successful test means that there is a smooth passage for the products of combustion to evacuate freely, with the nest no longer serving as an obstruction.

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How can I prevent birds from nesting in my chimney?

Some flues are vulnerable to rain entering the system. Rain entering the flue system is not too much of a problem in the short-term but can raise big issues in the long term. When the stove is in regular use in the colder parts of the year, it will usually evaporate. However, rain from even occasional showers in warmer months can collect in flue systems or the stoves themselves. Eventually, this can lead to rust. However, a rain cap chimney cowl can completely eliminate the problem and keep your stove in good condition.

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Prevent Birds from Nesting in your Chimney

Chimney sweeps can fit a bird guarding cap, cage or cowl over your chimney. In the future this will provide ongoing protection from any birds, insects or animals entering your chimney. It is vital to get the chimney cap fitted immediately after the nest removal process. If you leave it 24 hours, the birds may begin to rebuild the nest. Within a very short period a frantic bird may have layered up enough twigs to block the chimney for a second time.

Plus, birds that nest in your chimney are very likely to return again the next year to nest in the same place. Although, it’s worth noting that bird guards need to be chosen with care.

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