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Thread: Air bricks

  1. #1
    Regular Member GoldenWonder's Avatar
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    Default Air bricks

    Question for any builders or similar!

    My house was built in 1976, and it has two sort of 'bricks' on the outside wall. One is about a foot off the ground and the other above that, about 3 feet off the ground. These seem to open the walls right up to the inner wall so you can see the back of the plaster board! (f you point a torch in through the holes!)

    This really seems to make the kitchen cold, especially the floor on that side, so do I actually need them? There used to be an old boiler on that wall (now replaced with a combi) so are they there for that?

    Someone told me they might be to vent the cavity walls, but the house had cavity wall insulation 10 years ago so I'm wondering whether blocking them might help prevent the kitchen from cooling down.

    I've asked a couple of handy DIY types but they don't know the answer, and I don't want to block them if theres a good reason for them being there!

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    Regular Member wiggy's Avatar
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    TIMBER FLOORS:-
    you can never block the outside ones. please dont try as you will do some very serious damage to your home! wet rot and dry rot to name but a few. the bottom one will usually vent under the floor and is the most important. the top one can be blocked up on the inside providing you have another form of perminant ventilation. ie, a trickle vent on your window

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    Regular Member wiggy's Avatar
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    concrete floors
    yes you can block them up on the inside. leave one of the outside ones to vent the cavity. as i said in my last post, if you do block them inside then you MUST fit a trickle vent to the window.

    ( having said all that, check to see if they have a metal or plastic liner joining inside and out, or if there is evidence that there was one. if so, ignore everything i have said and block them off. they would of been, as you said, for the boiler only)
    Last edited by wiggy; 16th March 2009 at 21:21.

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    Regular Member GoldenWonder's Avatar
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    Its all concrete floors in my place. The lower brick is definetely higher than the floor level though.

    I can't actually see them on the inside - they're behind the plasterboard which is behind the cabinets!

    So they might be to vent the cavity then? Bizarre that they are only at the bottom corner of one of the walls.

    None of my windows have the vents, so I'd better leave them alone!

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    Regular Member andymcniven's Avatar
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    Most cavity wall insulation still allows air to circulate in the cavitys so it could still be for ventillation , depending on the age of the house it could be were an old larder cupboards been (these are vented to outside)
    Hope this helps

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    Ive had to put some airbricks into my flat to help my condensation problem as i didnt have enough ventilation...

    I personally wouldnt remove any airbricks or block them up in my future places.

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    Regular Member wiggy's Avatar
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    Quote Originally Posted by GoldenWonder View Post
    Its all concrete floors in my place. The lower brick is definetely higher than the floor level though.

    I can't actually see them on the inside - they're behind the plasterboard which is behind the cabinets!

    So they might be to vent the cavity then? Bizarre that they are only at the bottom corner of one of the walls.

    None of my windows have the vents, so I'd better leave them alone!
    yep. dont touch em

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    Regular Member GoldenWonder's Avatar
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    So the cavity must need ventilation even though its filled with a sort of foam/polystyrene type of gunk then?

    Its odd though, as it looks like the air bricks go straight through to the inside of the house (no larder!) and don't actually open out into the cavity itself - difficult to see exactly whats going on in there.

    Best left alone then.

  9. #9
    Regular Member wiggy's Avatar
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    Quote Originally Posted by GoldenWonder View Post
    So the cavity must need ventilation even though its filled with a sort of foam/polystyrene type of gunk then?

    Its odd though, as it looks like the air bricks go straight through to the inside of the house (no larder!) and don't actually open out into the cavity itself - difficult to see exactly whats going on in there.

    Best left alone then.
    if they dont vent the cavity at all then you can defo block em up and fit trickle vents.( which is really easy to do) to be honest, if they are behind the cabs then they arnt doing much to contribute to internal ventilation anyway. the cavity is the most important
    issue

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    Regular Member GoldenWonder's Avatar
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    I guess I'll have to double check when the light is better! Maybe they were put in for the old boiler or something as they seem to be enclosed up to the inner wall.

    When we had an extension put on last year, I asked the builder what they were for, and he didn't know either!

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