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    I'm using carrier board on my internal walls. There are a couple of places where I think a curve would look nice instead of a sharp corner. Maybe a radius of 75mm? Anybody any idea how I might go about this?
    • CommentAuthortony
    • CommentTimeAug 6th 2017
    Scribing template and slide it up the wall, some used to fix a dowel to the corner and leave it permanently like an anglebead.

    It can be done free hand, I would fix a batten up both faces once dry and make a piece of wood with your radius in it and use that as the slider, works best if it has ply fixed to to so or can't twist in the horizontal
    • CommentAuthorowlman
    • CommentTimeAug 6th 2017
    It's possible to buy pre formed internal and external curves in one or two different radii. I've only seen plastic ones and they are generally designed for dry lining but there may be others. Try specialist plastering suppliers. Its also possible to buy internal and external radiused corner trowels. IMO, It's quite difficult to get 1st class results and most plasterers aren't up to it.
    To some extent it depends on how you envisage the final appearance, e.g. the crisp precise look or a more "slightly uneven" rustic look.
    I assume that, as per previous discussions, you are using thin woodwool carrier boards. I am not quite clear how you will achieve a 75mm radius in this case, but assuming you can use offset studs to do so, how about a piece of roughly-shaped wood-fibre, finished with a rasp then plastered, meshed and finished?
    • CommentTimeAug 6th 2017 edited
    Two thoughts:

    (1) cut up a piece of 150 mm duct to form the shape, with expanded metal mesh over it to form a key.


    (2) form the curve with light straw clay https://en.wikipedia.org/wiki/Light_clay

    + What owlman said about the necessary skill: so practice a lot first if you're doing it yourself. Also watch out for cracking; use lime with a lot of fibre, dry slowly and compact as required.
    Our place was plastered like this in the mid 19th century:

    Start with horizontal boards sawn to curve
    Then nail on vertical laths
    Plaster over,
    I think a curved trowel/ tool was used to finish.

    Photo from behind a concave curved bit.

    Modern equivalent maybe uses metal lath instead of split wood.
    Thanks all, these are great ideas! I'd like a neat, consistent curve, so some kind of support with a mesh seems likely to be the best background, with @tony's template to finish the plaster.
    If you did it with wood-fibre and the lightweight lime plaster that usually goes with that insulation you will find that plaster very 'forgiving' for forming curves. It can be put on fairly roughly, and sponged to a better shape when firm. It's slow, but relatively straightforward.
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