4 inch hole for kitchen extractor. Under joist.

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

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