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Roof pitch too shallow for velux

Discussion in 'Building' started by Phillip Stephens, 13 Mar 2021.

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  1. Phillip Stephens

    Phillip Stephens

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    Hello All, we are undertaking a rear extension and are in a bit of a situation regarding the roof. The builder has put in the header and rafters but there is a 12 degree pitch (2.5 in 12 inches) so we're struggling to get the pitch to fit a velux which I think requires a 15 degree pitch.
    No battens or roof tiles have been installed yet. The builder is reluctant to re-install the header/beams and has suggested we could use timber firrings on top of the roof beams to give us the 15 degree pitch we need. Would this be an acceptable solution? I think the firrings will need to be in the region of 180mm or so to give us the pitch. The roof run for the extension is 3100mm. Thanks
     
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  3. ^woody^

    ^woody^

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    Velux make a specific upstand adapter for these occasions.
     
  4. Phillip Stephens

    Phillip Stephens

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    Thanks Woody. The cost for these upstands (almost as much as the velux itself) are quite prohibitive. Also we are trying to retain a flush finish if possible. Would the firrings proposal work as this would increase the pitch for the whole roof?
     
  5. ^woody^

    ^woody^

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    Why did your poxy plan drawer design a roof and rooflights that don't work together?

    If your builder was a bit clued up, he could make the upstand, but otherwise yes furrings can work if properly fitted - they may well need a ply or steel gusset.
     
  6. Phillip Stephens

    Phillip Stephens

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    you're right Woody. The architect has been a real let down. We're struggling through the build with a lot of to'ing and fro'ing with BC. Thanks for the advice.
     
  7. catlad

    catlad

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    I confused how can timber firings work were rafters can't?
     
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  9. Phillip Stephens

    Phillip Stephens

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    The rafters are unfortunately already installed and is currently providing a roof pitch of 12 degrees. The firings will be retro-fitted to these rafters and tied in as Woody has suggested with gussets. The fall on the firings will be aligned to provide the 15 degree pitch for a Velux.
     
  10. freddiemercurystwin

    freddiemercurystwin

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    If the builder was clued up he would have built it at the right pitch in the first place.
     
  11. Phillip Stephens

    Phillip Stephens

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    I don’t disagree Freddie. It’s been a struggle to get this far - weeks if no work, loads of stuff having to be re-worked. Unfortunately I have too much invested to cut my losses.
     
  12. noseall

    noseall

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    That should have set off alarm bells (12 degree pitch) immediately.
     
  13. catlad

    catlad

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    You have to ask yourself do you want to move forward with someone who dose not understand the basics.
     
  14. freddiemercurystwin

    freddiemercurystwin

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    It's OK, there's a roofing section on the forum for when the inevitable happens ....
     
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