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Damp Proofing

Capping of Unused Chimney

Anonymous user 09/03/2024 - 3.26 PM

Hi I have an unused chimney that I would like to be capped off so the risk of rainwater and drafts are I’ve had someone come out and they said they would use a mortar to block the chimney. Would this cause damp within the walls of the chimney breast? All blocked off fire places do have a vent on the walls. How should a chimney be capped off to avoid any damp issues ? Thanks

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4 Answers

Anonymous user

If you just capped it with mortar you would get serious damp in the walls my suggestion is use chimney cows with ventilation holes this way it stops the rain and still gives you ventilation .
Answered31 December 2021
5

Damp Investigations

Rating: 5 out of 5
Southall
If you cap it and don’t ventilate it top and bottom you will experience interstitial condensation in the flue with serious damp issues as a result
Answered3 January 2022
2

ADR Property Maintenance

Rating: 5 out of 5
Boston
chimneys need to be vented top and bottom of each separate flue to prevent a build up of condensation creating dampness.
Answered31 December 2021
1

Mr T Homecare

Rating: 4.9 out of 5
Tiverton
blocking the chimney will not cause dampness unless you plaster over the fire place in that case you will need to put a vent
Answered31 December 2021
1