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Loft Conversion: do beams have to be closed up to run joists across them?

Discussion in 'Floors, Stairs and Lofts' started by LikeMyHome, 16 Sep 2020.

  1. LikeMyHome

    LikeMyHome

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    In other words, which of the 3 options on the drawing are correct? Or all of them are fine? Please comment. Beams and Joists.jpg
     
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  3. LikeMyHome

    LikeMyHome

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    I see a lot of views but no comments. I hope this quetion has a reply. thanks
     
  4. tony1851

    tony1851

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    1. is fine, 2 and 3 redundant (why use a beam to support joists when you already have a wall?).
    The main beams don't have to be 'closed up'.
     
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  5. garyo

    garyo

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    Is the question about whether the ends of the beams need to be restrained or built in in some way?
     
  6. LikeMyHome

    LikeMyHome

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    Thanks for this explanation!
     
  7. LikeMyHome

    LikeMyHome

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    You are right. The reason I put options 2 is because that's what our builder suggested, so I thought you need to have beam ends restrained or built into something solid, hence option 2. Since on the left - it's the end of the house (free space) - I thought option 2 is a minimum to have.

    Option 3 - would be realised if the horizontal beams in option 2 on my drawings are connected to other horizontal beams from the 2nd half of the loft (not shown), which are also built in into the neighbours wall (semi-detached), hence the beams on 2nd half are like option 2 but with the image flipped horizontally.
     
  8. Notch7

    Notch7

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    Is the builder unsure what he is doing or are you asking out of interest for further understanding?

    Its not a loaded question, just interested to know the motivation, it may help with the answers.....esp as your questions are err rather confusing :)

    maybe you are drip feeding us a mensa test :D
     
  9. cdbe

    cdbe

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    Have read, but not fully understood, this and your other threads it seems that you, or your builder are massively overcomplicating what should be a relatively straightforward loft conversion.
    Maybe you should get some professional design input - even if it's just for the basic structure, leaving you and your builder to scratch your heads over the other elements like insulation etc.
     
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  11. LikeMyHome

    LikeMyHome

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    The project is frozen at the moment, builder got ill - no one to ask for now. But option 2 is what he was discussing with joiners couple weeks ago. Hence while builder is away - I wanted to double check if that is really necessary to have beams closed up - to be in better position to discuss with him when he's back.
     
  12. LikeMyHome

    LikeMyHome

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    Design gives you rooms and windows layout and materials to use but not such details as beams and joist location, does it?

    He is an experienced builder with a few completed loft conversion projects (verified) and a number of very experienced sub-contractors (like roofer and joiners I've seen and spoke to) do the works. He doesn't do anything himself but leads the project.
    But he is sometimes hasty on decisions -" let's do that and see what arises" and I don't like that - this is my house and I don't want it destroyed. Hence I want to understand and controll every major step before it's taken. If I described the whole problem - that would be a long, long post.
     
    Last edited: 18 Sep 2020
  13. johnny2007

    johnny2007

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    Option 1 is standard.
    Of course the beams will be built or strapped into supporting walls.
     
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  14. LikeMyHome

    LikeMyHome

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    Thanks Johnny. If the option 1 is OK and the beam ends can be free-hanging - why attach them to neighbours wall on the other half of the loft?
     
  15. johnny2007

    johnny2007

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    What do you mean by "attach them to neighbours wall"?
     
  16. LikeMyHome

    LikeMyHome

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    On metal hangers Beam to wall on hangers.jpg plugged into the wall - attached
     
  17. johnny2007

    johnny2007

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    That surely is not your neighbour's wall, that's a party wall that belongs to both properties.
    Usually, as you will need a party wall agreement in any case, you would dig into the wall and encase the beams into it (with spreader plates).
    Using hangers personally wouldn't be my first choice because the fixings would be pretty close and cracks might make the whole floor fail.
     
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