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Double up on raker for dormer?

Discussion in 'Building' started by xdrive, 10 Oct 2019.

  1. bobasd

    bobasd

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    another day - another wack job?

    the guy gives himself 24 hrs before ordering mats, including steels, for a job of uncertain dimensions and design after second guessing an architect, and asking for midnight advice on a DIY site - go figure.
     
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  3. xdrive

    xdrive

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    Sorry you misunderstood my post. They are both identical semi houses with same floor span, one in the same street and my mates is on next street.

    The steel won't be ordered yet (would be based on structural engineer) Scaffolding still needs to go up. Just preparing to make order on timber (y)

    And building regs will be involved from start to finish.

    Forgive me if my questions sound amateurish.

    I think I'm worrying too much as its my first house. According to floor span tables I can get away with 7*2.
     
    Last edited: 13 Oct 2019
  4. Leofric

    Leofric

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    But who is designing this house and obtaining building regulations approval :?:
    A structural engineer needs to deal with structural matters.
    Building control need to be involved now to approve the design and proposed construction before you think about ordering materials. (how can you order timber anyway when you don't know the sizes :?:)
    As noseall says WTF :!:
     
    Last edited: 13 Oct 2019
  5. johnny2007

    johnny2007

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    I call these sort of projects "build as you go".
    Start somewhere by breaking something, then nail some wood here and there or put some bricks one on top of the other.
    Soon it will take the shape of something.
    Something will come out of it.
    Eventually it will be finished.
    A work of art...


    Then a builder needs to go in.
    The wise builder will walk away, the merciful will knock everything down and start again, the inexperienced will swear like a sailor for many months trying to fix the unfixable...
    A story seen live many times.
     
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  6. xdrive

    xdrive

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    The builder has measured up and given me the sizes. I was just checking with the pros on here if the 8x2 are over specced and if they can be reduced that is still within range so I get more height in loft.

    Nevermind I'll keep the stronger 3x2 ceiling joists and rafters :)
     
  7. johnny2007

    johnny2007

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    So without dismantling half of the house you can get 2200mm height in dormer.
    That's more than enough, unless you plan to install a chandelier Trotter style...
     
  8. xdrive

    xdrive

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    That would be fine but I'm 6ft4 and dislike low ceilings. Also the ceiling will slope at minimum 1:60 so will reduce further by 7cm. That's why I want maximum height so thought I could reduce framing (within limits of course) rather than drop ceiling.

    unfortunately the house is already dismantled.:oops:
     
    Last edited: 14 Oct 2019
  9. johnny2007

    johnny2007

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    In that case you need a lot of luck...
     
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  11. Leofric

    Leofric

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    So is the builder dealing with building regs approval :?:
    :!:
     
  12. paulrockliffe

    paulrockliffe

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    I don't have an answer about the rafter sizes, but bear in mind that you need 800mm from floor to any opening of the windows and if you install the windows such that you have a cill that a child could climb on you'll need 800 from that. Your 690mm measurement would be close once you've got a window frame in, but the 600 is going to be a bit off. No idea if you have openings planned, but something to be aware of.
     
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  13. xdrive

    xdrive

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    The work is going to be carried out on a building notice. Is that ok?
     
  14. Leofric

    Leofric

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    Up to you , but that really depends on the builder knowing exactly what is required to comply with building regulations. Considering you are asking questions on here on how to build it ,that would make it seem a bit risky but it's up to you.
    My recommendation for what it is worth would always be to have these things approved before you start work on site.
     
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  15. xdrive

    xdrive

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    I agree. I tend to not trust builders and want to know quite a bit beforehand.

    If I could go back in time I would do things differently. However I'm kind of stuck now so will have to get on with it.
     
    Last edited: 16 Oct 2019
  16. xdrive

    xdrive

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    Yes that's right. I'm going to aim for 900mm. 1000mm window height is more than enough. Thanks (y)
     
  17. noseall

    noseall

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    And yet you insist that the project is carried out on a building notice?

    Absolutely bonkers.
     
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