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Creating a lead valley to join different roofs

Discussion in 'Roofing and Guttering' started by Nicky239, 30 Aug 2010.

  1. Nicky239

    Nicky239

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    Replacing old poly carbonate roof with new pitched sarked with plywood .Need to create a lead valley to join existing tegola shingle on one side and possibly lightweight slates on other ,any advice gratefully received from this DIYer :confused:
     
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  3. hardmetalking

    hardmetalking

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    If you could post some pictures it would be easier to describe what needs doing and the problems that need to be overcome. :D
     
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  4. Nicky239

    Nicky239

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    Hope these pics if roof help .Where valley will be not much of a gradient length is 2.4 m Would like to know procedure for making valley etc and best type .Any suggestions would be great. :confused:



     
  5. ^woody^

    ^woody^

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    The two roofs should not really meet at a point, and you will heed to fix a [150mm?] horizontal valley board on a slight fall between the two roof planes, with further [300mm?] support board up each slope.

    Lead may be problematic as it will need to be in maximum 1500mm lengths for expansion, and there is no way to seal the joints on such a low pitch.

    Felt may be a better option as you already have felt shingles
     
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  6. masona

    masona

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    Is this a conservatory?
     
  7. Nicky239

    Nicky239

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    It is a small porch , an addition onto the original house put on years ago with a polycarbonate roof
     
  8. masona

    masona

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    A tricky one this, need to think this over
     
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  9. Nicky239

    Nicky239

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    Cheers Masona,any thoughts appreciated .Regarding lead runs max 1.5m ,with such a low run what is the best overlap :confused:
     
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  11. hardmetalking

    hardmetalking

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    It is easily done in zinc, stainless steel or copper and will last forever. I've done hundreds of these and never had a problem.
    Just get a quote from a specialist roofing company. :D
     
  12. masona

    masona

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    Don't have much choice apart from previous posts, you will need a fairly wide gutter box system in place which can be done but a lot more work, I'm wondering it would be easier to change the design of the roof :cry: However now you've got this far, I think the only way is covering sheet with difference choice of materials
     
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  13. SASroofer

    SASroofer

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    Hi, can use lead, but to allow for the length you would require a higher code (thickness) such as code 7 or even 8, which can be very heavy.

    Alternatively you can get a lead worker involved, and he would most likely either instruct you to build a gutter sole with a step to incorporate two lead bays, or use a 'flowband' expansion joint which is a strip of rubber mechanically adhered to two pieces of lead, which are then welded to both bays thus providing relevant expansion.

    And Woody iscorrect about the 150mm ply gutter sole and layboards, layboards being a minimum of 200mm, which would mean you would need 200mm + 150mm + 200mm = 550-600mm roll of 3m milled lead sheet.

    Hope this helps :)
     
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  14. SASroofer

    SASroofer

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    Oh, and dont forget to patinate!
     
  15. Nicky239

    Nicky239

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    So just to get me head around this being a first timer .If I first fix a gutter sole with a gradient ,(what thickness ply would be best ?),then a support board on either side 200mm ,then lead on top .With existing shingle on one side and fibre cement tile proposed for other side just a little unsure of how far my tiles will cover lead up the sides .Does that make sense ?:oops:
     
  16. SASroofer

    SASroofer

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    Minimum 150mm cover over the lead. and i'd use 19mm w.p.b ply.
     
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