DIY Doctor

Issue with condensation on chimney stack no longer in use?

Postby G_94 » Sun Mar 21, 2021 7:21 pm


In the last year we moved into a 1960s semi detached. The house has a chimney stack which is no longer in use but, from what I can see, has no vents.

Over winter, we had some issues with condensation, one of which was on the chimney stack itself (yellowing on the wall in patches midway up the chimney stack).Weve looked in the attic and can see no signs of leaking around the chimney, and we've had a roofer repair some of the flashing around the chimney stack itself as a precautionary measure.

My thinking is this is a condensation issue caused by no ventilation in the chimney. As such, I was looking to install two internal vents (one in the bedroom and one in downstairs living room). To resolve this before redecorating. Could anyone tell me if they believe this is a correct course of action and, if so, tools needed to secure a vent? (if there's anything else going on here please feel free to tell me so we can look into it!)

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Postby stoneyboy » Mon Mar 22, 2021 10:52 pm

Hi g_94
Looks like you have rainwater getting into the chimney. Is the chimney capped and or suitably vented?
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