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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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General: insulating a corrugated iron roof

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  1.  
    • CommentAuthorpatrick
    • CommentTimeAug 16th 2007 edited
     
    Hi
    I need to insulate a corrugated iron roof to make a habitable space.
    My first thought was to rip it down and start again but that seams a waste as it is in good condition.

    It is built on a strong steel frame, sloping at about 12 deg. and the stone walls are 500mm+ thick.

    The current plan is build a ceiling of 80mm Celotex (or similar) inside with a small ventilated space. Later I want to put a 50mm layer of a mixture of gravel and soil on top for a green/brown roof.

    I have never done this before and would welcome any suggestions or better ideas.

    The site is in Spain where there is NO economic construction timber.
    • CommentAuthortony
    • CommentTimeAug 16th 2007
     
    The sheeting will rust through if you do that with soil etc.

    Can you put in a lower flat ceiling with quilted insulation over it?
    • CommentAuthorpatrick
    • CommentTimeAug 16th 2007
     
    Rust - true .... I was planning another sheet if celotex (30nn) on top if only to spread the load and posibly a SP rubber membrain. But it is just for show so the best environmental solution is to paint it terracota.

    Lower ceiling .... yes extra quilying is a good idear but the celotex is structural.

    I have never worked in spain before and it is hard to concider the environment when wood is so hard to find.
    • CommentAuthortony
    • CommentTimeAug 16th 2007
     
    Celotex is not structural stuff!
  5.  
    .........unless used in structurally insulated panels
  6.  
    Why not use the Onduline oversheeting system:

    http://www.ondulinebuildingproducts.net/p0097.htm

    You can then incorporate the insulation over the existing roof.

    You won't lose any space inside either.

    Needs a bit of timber, though not that much.

    Not sure how 'green' Onduline is.

    Henry
    • CommentAuthorfuncrusher
    • CommentTimeAug 16th 2007
     
    Spray the underside with insulating foam: large cylinders like gas cylinders are available on the web, or you can get it done commercially. Your proposal will not work. Very unlikely that the roof structure is strong enough for an imposed extra load of soil/gravel.
  8.  
    I would go with the flat ceiling solution, an easy job to do and no problems with condensation on the roof sheets provide you ventilate the new roof void.

    I do not think squirty foam is a practical solution for this - you would still need to fix something underneath to get a flat surface for decorating.

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