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Extension pitched roof

Discussion in 'Roofing and Guttering' started by lynchnigel, 8 Apr 2021 at 8:02 PM.

  1. lynchnigel

    lynchnigel

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    Hi all, we are planning on adding a pitched roof to an extension we want to build with Marley concrete tiles on it and two roof lights in it.

    The total span will be about 5.5 metres.
    31 degrees pitch.
    Which leaves the rafters length at 3430mm and the rise 1646mm

    What I wanted to ask is if we could away with no purlins and to plasterboard directly under the rafters.
    Any alternatives?

    Any help appreciated thanks in advance
     
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  3. Notch7

    Notch7

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    I'm guessing you mean a mono pitch with one end against the house.

    I don't see why not, just need some beefy common rafters, maybe closer spacing.
     
  4. lynchnigel

    lynchnigel

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    No sorry a full pitched roof
     
  5. catlad

    catlad

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    8x2" probably do, but you will need a ridge beam also.
     
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  6. Notch7

    Notch7

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    With a double pitch you need a structural ridge which is usually a steel with a timber plate stuck on top to nail the rafters to.

    If it's hipped then you need a cranked steel.

    You need a structural engineer to specify
     
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  7. lynchnigel

    lynchnigel

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    Thanks very much chaps for your opinions, it's not hipped no, just a garble end with bifold doors under it.
    Sounding like an engineer then if we want no joists.
    Sounding expensive so probably stick with ceiling joists.
    For the span (5.5m) would we still need an engineer do we think if we had a full pitched roof
     
  8. freddiemercurystwin

    freddiemercurystwin

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    Not prohibitively expensive to employ an engineer, I paid £135+VAT for the the ridge design on this one.

    Screenshot_2021-04-09-02-58-29-73_f541918c7893c52dbd1ee5d319333948.jpg

    Screenshot_2021-04-09-02-57-30-83_f541918c7893c52dbd1ee5d319333948~2.jpg
     
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  10. lynchnigel

    lynchnigel

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    Yes, that's pretty good, that might be the way to go, at least I will have the detail required to move forward.
     
  11. freddiemercurystwin

    freddiemercurystwin

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    I'll PM you my invoice.
     
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  12. ^woody^

    ^woody^

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    Looks like things have come nicely since you joined the forum
     
  13. lynchnigel

    lynchnigel

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    How do you mean?
     
  14. ^woody^

    ^woody^

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    The bloke above me.
     
  15. lynchnigel

    lynchnigel

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    Never did get the invoice lol
     
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