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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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General: Vermiculite/leca lime crete floors?

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  1.  
    • CommentAuthorsye
    • CommentTimeMay 15th 2007
     
    trying to source leca in the southwest and not having much luck so wondering if anyone has used vermiculite/perlite instead of leca in a lime floor? Okay or not?
    • CommentAuthorRachel
    • CommentTimeMay 16th 2007
     
    I had leca delivered form Ty Mawr in Brecon. They may deliver to you depending how south you are.
  3.  
    Leca will not absorb or wick water, whereas vermiculite and perlite will. Don't use either of them in limecrete, as it will destroy its mechanical function. Also, neither is as robust as leca or glass pumice, meaning that they crushe rather than compact, and thus don't have the insulating qualities.
    Mike Wye should be able to provide leca or pumice (I prefer the pumice as it's made at lower temperatures - ie, greener - compacts better and doesn't tend to 'swallow up' pipes and underfloor services when you're walking over it and all the clay spheres roll together).
    • CommentAuthorBarcud
    • CommentTimeMay 17th 2007
     
    Hi Gervase

    What spec do you recommend for a new Lime floor and what membranes if any would you use.
    • CommentAuthorsteve mac
    • CommentTimeMay 17th 2007
     
    Hi all,
    I have removed what I suspect is vermiculite granual insulation which had been laid between the joist in my loft. I would like to recycle it by way of mixing it into a concrete floor (2.5 m X 2.5 m )which I plan to do in the near future.
    Do you consider this appropriate and if so what ratio of vemiculite do I use in the mix. My intention is a mix of 5 gravel to 1 sand. Your comments would be appreciated.

    Steve Mac.
  6.  
    Spec wise I use a geotex breathable non-wove polypropylene membrane tdp115 is good - and is also great for French ditches- but there are others on the market) over compacted hardcore (or just the subsoil if it's regular enough and well compacted), followed by four inches of glass pumice, then another membrane, followed by four inches of limecrete made with 3:1:1 crushed limestone aggregate, sharp sand and NHL5 lime, mixed dryish. The top surface is dressed off with a derby and then swept with a stiff brush after 36 hours (using old celotex battens as 'stepping stones' to spread the sweeper's weight), then the floor is left to cure for at least 10 days under a polytarp before it's walked on normally.
  7.  
    Hi sye,
    There is a company called Isokern (part of the Lefarge group) who manufacture high quality chimney liners and part of the system is the use of a leca cement insulation mix between the liners and the brickwork. Isokern stockists will keep bags of leca. www.isokern.co.uk.

    David Thorpe.
    • CommentAuthorbob
    • CommentTimeMay 30th 2007
     
    try mike Wye and assosiates, in Devon, they sell leca and will deliver.

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