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Air Vent Issues

Discussion in 'Home and Garden' started by matthab, 2 Feb 2020.

  1. matthab


    Joined: 19 Apr 2009

    Posts: 3,159

    Evening All,

    I own a Victorian apartment which has some damp issues I am working through fixing. In December we had the walls taken off the front room to resolve some moisture ingress which was down to an old vent not being covered up, this meant moisture and cold air was going down the back of the plaster boards.

    This got me thinking that there is the exact same vent in my dinning room and that is suffering similar issues (condensation/cold etc).

    Suspect Vent

    Inside the vent (you can see the plaster board).

    I know old buildings should breath but this seems a little excessive. Does anyone have any ideas how I can can cover this up temporarily to see if it makes a difference and not cause any issues?

    Thanks for any help,
  2. BigBoy


    Joined: 19 Oct 2002

    Posts: 6,394

    Location: Bath

    Covering up the vent internally will be the cause of the issue, covering up the external vent will not fix this.
  3. NoobCannon


    Joined: 13 Jun 2011

    Posts: 5,681

    temp fix you could try and mastic something over the vent but would be near impossible to get a perfect seal

    Fill it with expanding foam or brick it up for a perm fix.

    Had to do something similar myself. Previous owner moved boiler from kitchen to loft and just put a thin metal plate over the 100mm hole in the wall inside (assume to stop spiders etc getting in) could actually feel a draught around the plate. Where it wasnt sealed properly.
  4. ristac


    Joined: 18 Aug 2011

    Posts: 694

    Location: Northampton

  5. Steampunk


    Joined: 1 Jun 2013

    Posts: 9,175

    What other ventilation is in that room? Old buildings like to breathe, and covering up vents can often lead to moisture and condensation. You might have to actually put a vent back in there. Maybe you could test be cracking open a window on a semi-permanent basis, and if that improves things, try re-enabling a vent there?