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32/1000 box profile steel sheet – fixing to ridges instead of valleys

Discussion in 'Roofing and Guttering' started by DSJC, 25 Jan 2020.

  1. DSJC

    DSJC

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    Your thoughts please

    Provided suitable packing and longer fixings are used, will fixings on the ridges of box profile sheet (instead of the recommended valleys) cause problems ?

    Reason for asking – I want a detached garage roof slope to be less than the recommended minimum for box profile sheets. So I plan to use extra lap sealing and fixings on ridges to reduce water ingress from any ponding or ice dams.

    Thanks
     
    Last edited: 26 Jan 2020
  2. catlad

    catlad

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    I have bought those sheets in 7m long so no need for joins unless you have a huge garage. The only problem I can see if you fix in the top is can you get them tight enough to self seal before they deform the metal!
     
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  4. DSJC

    DSJC

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    Yes this is the reason for using packing. I was just trying to think of any other potential issues. For instance - is max wind uplift load reduced ?
     
  5. catlad

    catlad

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    I can't see the wind ripping them sheets of if you use the correct tek fixings
     
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