Your browser isn't supported
It looks like you're using an old web browser. To get the most out of the site and to ensure guides display correctly, we suggest upgrading your browser now. Download the latest:

Welcome to the MSE Forums

We're home to a fantastic community of MoneySavers but anyone can post. Please exercise caution & report spam, illegal, offensive or libellous posts/messages: click "report" or email forumteam@. Skimlinks & other affiliated links are turned on

Search
  • FIRST POST
    • nobile
    • By nobile 9th Sep 17, 9:11 PM
    • 458Posts
    • 45Thanks
    nobile
    Air brick / Vent for sealed chimney question
    • #1
    • 9th Sep 17, 9:11 PM
    Air brick / Vent for sealed chimney question 9th Sep 17 at 9:11 PM
    Hi. In one of my ground floor rooms, the chimney has been totally sealed/bricked up. We have had a few damp patches on one side of the chimney wall.

    After painting we noticed that the paint become dry/flaky...that was a few years ago

    I had the chimney capped so no rain etc falling through now but the damp issue stated above still there....contained & not getting worse

    There is NO vent or air brick in the chimney - I know there should be one!

    My question is as a first response, would drilling a few holes in the chimney wall & covering with a vent suffice OR does there need to be an air brick fitted?

    Or none of the above?

    Many thanks
Page 1
    • Davesnave
    • By Davesnave 10th Sep 17, 12:49 AM
    • 23,512 Posts
    • 89,312 Thanks
    Davesnave
    • #2
    • 10th Sep 17, 12:49 AM
    • #2
    • 10th Sep 17, 12:49 AM
    There is nothing magical about an air brick; it just ensures there's enough air entering relative to the area it takes up. If you make a good, almost brick -sized hole and cover with a vent that will do much the same job.

    But what's behind the chimney wall at that point? Is it a neighbour's house or the great outdoors? If outdoors, look for causes of damp in things like raised garden levels, or a leaky downpipe, drain, or soak away.
    'A society grows great when old men plant trees whose shade they'll never sit in.'
    • Apodemus
    • By Apodemus 10th Sep 17, 9:14 AM
    • 950 Posts
    • 767 Thanks
    Apodemus
    • #3
    • 10th Sep 17, 9:14 AM
    • #3
    • 10th Sep 17, 9:14 AM
    ...and even an adequately vented but unused chimney can be damp - the residue of all the coal and wood burned in the fire is hygroscopic and absorbs moisture from the atmosphere, which can lead to damp patches in the adjacent wall.
    • nobile
    • By nobile 10th Sep 17, 2:30 PM
    • 458 Posts
    • 45 Thanks
    nobile
    • #4
    • 10th Sep 17, 2:30 PM
    • #4
    • 10th Sep 17, 2:30 PM
    There is nothing magical about an air brick; it just ensures there's enough air entering relative to the area it takes up. If you make a good, almost brick -sized hole and cover with a vent that will do much the same job.

    But what's behind the chimney wall at that point? Is it a neighbour's house or the great outdoors? If outdoors, look for causes of damp in things like raised garden levels, or a leaky downpipe, drain, or soak away.
    Originally posted by Davesnave
    Its a terraced house with neighbour on other side. They have no damp patches etc.
    • illusionek
    • By illusionek 10th Sep 17, 5:02 PM
    • 118 Posts
    • 23 Thanks
    illusionek
    • #5
    • 10th Sep 17, 5:02 PM
    • #5
    • 10th Sep 17, 5:02 PM
    When I bought my current house I was advised by my surveyor not to makes any vents inside as it may cause damp.
    • Davesnave
    • By Davesnave 10th Sep 17, 5:44 PM
    • 23,512 Posts
    • 89,312 Thanks
    Davesnave
    • #6
    • 10th Sep 17, 5:44 PM
    • #6
    • 10th Sep 17, 5:44 PM
    When I bought my current house I was advised by my surveyor not to makes any vents inside as it may cause damp.
    Originally posted by illusionek
    I can't see how ventilating a chimney could cause dampness, unless the air in the house itself was laden with moisture for some reason.

    Warm, damp air condensing on cold walls? Seems odd.

    People sometimes have problems when they stop using the chimneys on older houses.
    'A society grows great when old men plant trees whose shade they'll never sit in.'
    • nobile
    • By nobile 5th Oct 17, 1:01 AM
    • 458 Posts
    • 45 Thanks
    nobile
    • #7
    • 5th Oct 17, 1:01 AM
    • #7
    • 5th Oct 17, 1:01 AM
    Hi guys. Me again

    I've decided to install a vent in the chimney. Would drilling 4 or 5 holes (16mm) about 20-30cm above the skirting suffice, and then cover with plastic vent cover with fly guard?

    I know an airbrick would be a better option but I imagine I'd have to call someone out...then we are looking at a fair bit of cash.

    Thanks
    • FreeBear
    • By FreeBear 5th Oct 17, 11:28 AM
    • 1,361 Posts
    • 1,916 Thanks
    FreeBear
    • #8
    • 5th Oct 17, 11:28 AM
    • #8
    • 5th Oct 17, 11:28 AM
    Four 16mm holes will be more than enough. Saves having to chip away at the plaster to find the mortar joints between the bricks.

    An air brick isn't that difficult to fit once you know where the mortar joints are. Use a long drill bit and drill holes all round the mortar. Then with a hammer & chisel, break up the brick & mortar. Allow a decent gap all round the air brick & surrounding brickwork, and pack the space with a fairly weak cement/sand mix. Probably a mornings work compared to 20 minutes to drill four 16mm holes.
    Her courage will change the world.

    Treasure the moments that you have. Savour them for as long as you can for they will never come back again.
    • nobile
    • By nobile 5th Oct 17, 12:36 PM
    • 458 Posts
    • 45 Thanks
    nobile
    • #9
    • 5th Oct 17, 12:36 PM
    • #9
    • 5th Oct 17, 12:36 PM
    Four 16mm holes will be more than enough. Saves having to chip away at the plaster to find the mortar joints between the bricks.

    An air brick isn't that difficult to fit once you know where the mortar joints are. Use a long drill bit and drill holes all round the mortar. Then with a hammer & chisel, break up the brick & mortar. Allow a decent gap all round the air brick & surrounding brickwork, and pack the space with a fairly weak cement/sand mix. Probably a mornings work compared to 20 minutes to drill four 16mm holes.
    Originally posted by FreeBear
    How much would such a job cost if I got someone in (an approx figure if you would know?)
    • FreeBear
    • By FreeBear 5th Oct 17, 1:41 PM
    • 1,361 Posts
    • 1,916 Thanks
    FreeBear
    Very rough guess... Including materials, probably around £150-200 (seems to be the typical day rate).
    Her courage will change the world.

    Treasure the moments that you have. Savour them for as long as you can for they will never come back again.
Welcome to our new Forum!

Our aim is to save you money quickly and easily. We hope you like it!

Forum Team Contact us

Live Stats

386Posts Today

5,019Users online

Martin's Twitter
  • I believe I can boldly go where no twitter poll has gone before https://t.co/HA0jC92gAK

  • OK I'm wilting to public pressure and there will be a star trek captain's poll at some point next week

  • I can get that. My order is 1. Picard 2. Janeway 3. Kirk. Too early to say where Lorca will end up (or would you? https://t.co/kawtCOe9RA

  • Follow Martin