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Green Building Bible, Fourth Edition
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Housing - New Build: How to make clay plaster...

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  1.  
    So...

    I have done my tests, and got my clayey-suboil to sand ration about right ish and now have an enormous pile of clay sat in a shallow bowl, lined with DPM, created in the garden...

    The question is what next...

    1. allow to dry then smash into powder, then dry mix with sand

    or

    2. saturate to a slip and then mix with sand in a mixer / tread in.

    J
    • CommentAuthorevan
    • CommentTimeApr 19th 2010
     
    Have done 2 before, hand mixed IIRC.

    I'm sure you know, it's not easy stuff to work with. Put it on too thick and it *will* crack horribly as it dries...
    • CommentAuthorjamesbl
    • CommentTimeApr 19th 2010
     
    I have also done '2' before and would add that it helps to leave the mix to stand before use to ensure clay has absorbed all the water it is going to, before applying . Then 'knock up' with a paddle mixer or even a drill paddle.
    I thought it was good to use - soft on the hands and nice to apply ! , but Evan is right, it will crack if too thick. If you have to go thick, then apply in several coats . The most difficult thing for me was the drying time .
  4.  
    mmmh... will get a tarp over it and keep it watered till needed.

    re cracking and thick, how thick is thick and any thoughts on straw, sand etc...?

    J
    • CommentAuthorevan
    • CommentTimeApr 19th 2010 edited
     
    More than a couple of mm per layer really.

    We were using it as "top coat" on mud/straw render. I'm not sure you want to add sand to it, I don't think we did. To be fair most of the difficulty we had was due to trying to plaster internal curved walls :shocked:

    What are you plastering, out of interest?
  6.  
    The inside walls of a house.

    The material is really pretty much 100% clay rather than clayey subsoil, as such about 3.5:1 clay to sand seemed to strike a balance between cracking and dusting but I suppose thats very site specific.

    J

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