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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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General: Chimney airbrick vent to outside

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    Has anyone put an airbrick in an disused chimney to ventilate it to the outside?

    A disused masonry chimney has a disused spiral flue liner in it. The inside of the flue liner is ventilated at the top through a chimney cap, but the space inbetween masonry and flue liner is not ventilated, there is damp that might be condensation.

    Other disused chimneys have airbricks in the old fireplaces, but aside from the air leakage problem, there is no access to this fireplace from the inside, or to remove the spiral liner or infill the chimney.

    I am thinking of putting airbricks top and bottom of the masonry chimney to ventilate it out through the outside wall, then IWI. Anyone got experience/pros/cons/alternatives?

    Thanks!
  2.  
    Vented to the outside is going to create a big heatsink for the winter. IWI would mitigate this but not negate it.

    Best option would be to remove the chimney down to ceiling level and then cover with the same insulation as in the loft.

    Air bricks in the fireplace help as with the other disused chimneys but these also create a big thermal draft with accompanying heat loss.

    If you can't take them down another option would be to fill the chimneys with insulation up to ceiling level and put a air brick in above the insulation level.
  3.  
    Yes agreed, those would be ideal, but the layout of the house means there is no access to this particular chimney (without removing the roof or building a hugely cantilevered scaffolding!).

    Anyone tried ventilating a chimney to the outdoors? I half suspect there is a reason why they usually are ventilated through airbricks inside the old fireplaces but can't figure out why that's better than ventilation to outdoors.
    • CommentAuthorMike1
    • CommentTimeMay 22nd 2023 edited
     
    Posted By: WillInAberdeenI half suspect there is a reason why they usually are ventilated through airbricks inside the old fireplaces but can't figure out why
    Because the difference in internal-external temperature creates a stack ventilation effect. That is, the warm internal air is less dense and therefore more buoyant and will rise through the chimney.
    • CommentAuthorJonti
    • CommentTimeMay 22nd 2023
     
    If you can remove a brick to install an airbrick can you not also remove a brick at a suitable height and fill chimney with insulation then vent above that level?

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