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Housing - New Build: Shed Roof Slate Fixing

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  1.  
    • CommentAuthorTriassic
    • CommentTimeAug 9th 2014
     
    As part of my new build I'm building a blockwork shed first, this will give me somewhere to store stuff securely on site. To aid security I was thinking of covering the roof in OSB. Could I simply cover the OSB with a membrane and nail the slates directly to the OSB?
    • CommentAuthorowlman
    • CommentTimeAug 9th 2014
     
    OSB and membrane is OK but ideally you need to counter batten and batten.
  3.  
    What Owlman said. That's the normal roof construction here, also in Scotland I think, although normally using a tongue and groove sarking board rather than OSB.

    Have you considered to make the roof mono-pitch so that you can maximize the area available for your solar panels?
    • CommentAuthortony
    • CommentTimeAug 9th 2014
     
    shed would need pp for solar panels

    I would hail with 30mm alloy clouts straight into the osb, no need for membrane. is this a temporary shed?
  5.  
    Posted By: tonyis this a temporary shed?
    No such thing! A bit of membrane will help protect the OSB a lot ie 80/20 rule but battoning is the 100% way forward - or cover with burned on bitumen - cheaper, quicker and more effective if you wouldn't be putting battons on, also if extended beyond OSB will drip well if no gutter, which is a bit more difficult with slates.
    • CommentAuthorTriassic
    • CommentTimeAug 9th 2014
     
    The shed is permanent, the planning requirements for the site require all roofs to be slate. If I said it was a greenhouse could I put a glass roof on :wink:
    • CommentAuthorEd Davies
    • CommentTimeAug 9th 2014
     
    Posted By: Chris P BaconThat's the normal roof construction here, also in Scotland I think, although normally using a tongue and groove sarking board rather than OSB.
    Pretty sure sarking board isn't usually T&G in Scotland.
  8.  
    Badly phrased. The sarking here in Sweden is t&g normally 17mm x 95mm or 22mm x 95mm. You can also buy it stapled together in panels about 0.5m x 3.6m which reduces the time considerably to fix on the roof.
    • CommentAuthorEd Davies
    • CommentTimeAug 9th 2014
     
    Thanks for the clarification Crispy. But is T&G guaranteed to vapour open enough to be helpful? That's the main point of using narrow boards in the first place, isn't it?

    Triassic, worth considering use of individual boards - I kicked up a fuss about the cost vs OSB for mine until a local builder told me that, yes, OSB used to be cheaper but now OSB is probably more expensive. Also boards are a lot more labour intensive but easier to deal with if you're working on your own.
  10.  
    Posted By: Ed DaviesBut is T&G guaranteed to vapour open enough to be helpful? That's the main point of using narrow boards in the first place, isn't it?
    A quick search suggests that when used with a modern breathable membrane it is diffusion open.

    Traditionally it would have been used with a bitumen underlay and some fairly common roofing materials here such as mineral felt or standing seam metal roofing are installed directly without battens.

    I know that my roof is extremely well ventilated with a air passage under the sarking formed with battens and hardboard foamed at the edges to prevent wind wash. There are vents at the eaves and at the ridge there are vents through the sarking.

    I never thought about it. I assumed that the boards are narrow due to the poor quality sapwood that it is made from.

    I also assumed that it is t&g to give the roof more strength for the snow loads but I never checked so may be completely wrong.

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