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GRP Valley help please

Discussion in 'Roofing and Guttering' started by Mark C Johnson, 6 Jun 2021.

  1. Mark C Johnson

    Mark C Johnson

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    Good afternoon all. I am having a kitchen extension in my bungalow and am concerned that the GRP gullies have not been fitted properly by the roofer. They have sanded strips up both sides but have been told by the builder that they don’t mortar them in anymore. Further, there are no gully boards to support the gullies and no strips of felt running under the gullies. Also, the existing and new felt has not been overlapped under the gullies. It just goes about 2 inches over the edge of the gully and I can see daylight coming in as per the photos. I think it will leak?
    Lastly, should the top of the gullies be treated with lead?
    Thanks in anticipation of your help. Mark C Johnson
     

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  3. datarebal

    datarebal

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    Trying it on get him back
     

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  4. Mark C Johnson

    Mark C Johnson

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    I presume you mean by that it's all wrong or is there anything specific I should quote? Thanks, Mark
     
  5. datarebal

    datarebal

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    It's all wrong . See graphic from klober . Regardless of make the principles the same .
     
  6. Makie

    Makie

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    Not really, it's all area dependent too.

    It doesn't happen in Scotland anymore yet we still use grp valleys
     
  7. datarebal

    datarebal

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    What doesn't happen ?
     
  8. Makie

    Makie

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    Cement in the valleys. Very rarely will you see it up here.
     
  9. datarebal

    datarebal

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    So how would you keep the small cut tiles in?
     
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  11. Makie

    Makie

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    Clips and glue these days. Sometimes a nail with some wire.
     
  12. ^woody^

    ^woody^

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    There are two types of fibreglass valleys - wet, which is sealed with mortar, and dry which is not.

    Your roofer is correct in a sort of clueless cowboy way.
     
  13. Mark C Johnson

    Mark C Johnson

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    Hi Woody, would I be correct in saying this is a wet gully as it has sanded strips along the edges? Also should there be valley boards and or ,at least a strip of felt beneath the grp valley? Thanks, Mark
     
  14. datarebal

    datarebal

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    Not in this case.
    Read the post again
     
  15. ^woody^

    ^woody^

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    Yes you are correct. Fibreglass trays need to be supported, unless the manufacturer states otherwise - and I don't think that there are any that do not need support.
     
  16. ^woody^

    ^woody^

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    There are not wet and dry fix valleys? o_O
     
  17. datarebal

    datarebal

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    Yes , but this one is wet ..
     
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