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vertical 'slate' tile cladding

Discussion in 'Roofing and Guttering' started by hi1, 8 Jun 2019.

  1. hi1

    hi1

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    Firstly thanks for your time reading this.
    The situation is this. I have a gable end of a barn in France. The lower element is granite random field stone. Above this resting on the wall and attached at the sides, I hope, is a substantial wooden soft wood frame with other original oak elements . The facing of this frame is sterling board which is in turn rendered with a lime based plus cement, probably, coating. The chickens eat it as it falls off. The render doesn't appear to be water proof and as such the boarding is warping moving causing the render to fall off at a quicker rate.
    I have inherited a large quantity of what I hope are cement fibre slate lookalikes they are 450mm x 300mm.
    I propose removing the render. Installing what I think of as roofing underlay the black cloth like stuff not bitumen with a foot overlap laid horizontally.
    I then propose putting vertical wooden battens at 400mm centres screwing to the sterling board. From these I intend fixing the horizontal battens from which the tiles will be secured to.
    Now for the crux of the problem, overlap. I propose hanging the tiles from the battens by means of screwing after making holes with proper tool. I am hoping that I can have these holes fairly close to the edge, top and from outer edges. I would hope the be able to hang the next layer of tiles, joint offset, with say 150mm overlap meaning that each tile exposed moves me up the wall 300mm. I have 7meters by 4.2 meters to cover allowing for it being an apex half that.
    The local method is by spring clips which give a rise each row of tiles of 150mm and the effect of having at any given point of three layers of slate. There's no underlay employed.
    Is any part of my plan do able does there need to be only 150mm rise per tile row or will 150mm overlap work. Any other advice, wood sizing, pitfalls etc entertained.
    Merci.
     
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  3. hi1

    hi1

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  4. catlad

    catlad

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    On a vertical application you can get away with 50mm overlap and if you are short of slates if that's what they are?
    you can leave a 50mm gap between each slate if you are nailing them. You will need to make sure there is drainage behind you horizontal batons
     
  5. datarebal

    datarebal

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    You'll have no headlap.
    For a minimum headlap you'll need an exposed slate of 200 mm
    You could just by slate hooks and you cant go wrong . Careful with those slate/tiles they might be asbestos even in France
    As catlad says they can be spaced horizontally to cover more area.. if you are that way inclined.
     
    Last edited: 8 Jun 2019
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  7. hi1

    hi1

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    Thanks for your replies.
    Firstly good point about the asbestos.
    If the horizontal battens are attached to say 40mm uprights that should give that clearance behind the slates for drainage, yes? and the verticals tannalised or whatever they sell here should be o.k.
    Headlap I don't understand, is that the amount that has to overlap so to leave 200mm exposed I'd need an overlap of 250mm with a tile of 450mm.
    Slate hooks are they the things that are used to keep a tile in place if the nails have gone?
    And I'm going to put the nail holes 50mm from the top of the tile and 50mm in from the edge if you thinks that's enough.
    Good point about the spacing also to make them go further. I have asked, I think, whether its possible to still source this size tiles but just got a gallic shrug.
     
  8. Thomasthepiperson

    Thomasthepiperson

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    How old are the slates? I know Asbestos was banned in France in 1997
     
  9. datarebal

    datarebal

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    Fixing at the top wont be much use .They will flap about and snap off
    Headlap, Take a look at any of the slate roofs , you will see at the top they actually have three thickness's of slate. Without this the roof will not be weather proof.
    As suggested, 50 mm headlap will work on a vertical face.
    in your case, you will have 200mm exposed 250mm covered by other slates 50mm of which will be your headlap.
    Slate Hooks, (crochets) are the preferred fixing method throughout France (a few exceptions done by us :) )
    You can get these hooks of various lengths that either drive into the batten or substrate or simply hang on the appropriate thickness batten.
     
  10. Leofric

    Leofric

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    Yes , tantalised battens and counterbattens provide drainage behind the slates.
     
  11. DIYnot Local

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