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4 inch hole for kitchen extractor. Under joist.

Discussion in 'Building' started by mrbg07546, 11 Jul 2020.

  1. mrbg07546

    mrbg07546

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    Hi.

    I have a house where it is terraced and has a alley way. (Where I have a room above it)

    I want to put a kitchen extracter fan vented outside. However I realised if I cut hole it may cause the joist to drop. Is there any way round this?
     

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    Last edited by a moderator: 13 Jul 2020
  2. sircerebus666

    sircerebus666

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    Yes , move the hole

    Why do you have it so high anyway? You will probably find that the roof of the alleyway is lower than that hole , plus don't you intend to plasterboard and skim the ceiling? Plus you have to take into account the surround of the extractor fan , you chop a hole that high you will end up with a hole you can't use
     
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  4. xdrive

    xdrive

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    Should be 1 inch max
     
  5. tony1851

    tony1851

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    Find a local steel fabricator or stockholder. They usually have off-cut bins; see if you can find a short length (300mm?) of 12mm steel plate about minimum 75 across and fix it under the joist. You will need to cut a 12mm notch on the underside of the joist to slip the steel plate in - the plate will then act as a small beam to span the hole.
    (before cutting the notch, you might need to prop the joist to take the weight off it - just use a long piece of 3x2 from the floor and wedge it under the joist).
     

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  7. VinceTP

    VinceTP

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    Hi mate, I'm on the same boat. What did you end up doing?
     
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