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Housing - Renovation: Clay based exterior paint

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  1.  
    • CommentAuthorTriassic
    • CommentTimeAug 6th 2012
     
    I need to lime wash the two exterior gable end walls of my 1770s home. They were last done two years ago and they have suffered some flaking.

    I discussed this with a local 'expert' who suggested that rather than using traditional lime wash I should be using a clay based paint. I'm familiar with clay based interior paint but not exterior. Can anyone give advice on its use and how do I make it?
    • CommentAuthorTriassic
    • CommentTimeAug 8th 2012
     
    So no one has any experience of using or making clay based exterior paint? Well I am suprised!
  3.  
    What is the wall construction and finish (plaster) that will be painted?

    Why is a clay paint better than lime?
    How often do you want to repaint the gable end walls?
    How exposed are the walls, what kind of weather?

    Clay paint is a nice idea but not very practicle as it will probably need to be reapplied very often.

    As I understand it, a clay paint will have some sort of oil added to make it weather resistant
    • CommentAuthordjh
    • CommentTimeAug 8th 2012
     
    Wot Bot dP said.

    Clay wears away when it rains (unless you fire it into pottery!) So the only times you can use it on the outside is when it is a very dry region (Arizona desert?) or there are very large roof overhangs or you're prepared to resurface it regularly. Are there existing historical buildings with exterior clay in the neighbourhood where you want to use it?

    There are lots of books and other sources about making and using clay for building and decoration. Your local 'expert' should presumably be able to tell you.
    • CommentAuthorTriassic
    • CommentTimeAug 17th 2012
     
    Both gable ends are exposed to the wind mainly but also plenty of rain. They were limewashed for the first time last year.

    During the heat of the summer it started 'snowing' limewash particles and this has left the lime render exposed in places.

    Any ideas on increasing the durability of limewash?

    So thanks for the feedback, looks like I'll be back up the ladder lime washing ;(
    • CommentAuthordjh
    • CommentTimeAug 20th 2012
     
    So the underlying surface that you're trying to protect is lime render? What was its surface like before the limewash? Had it been previously painted with anything else? Advice pages like these ..

    http://www.buildingconservation.com/articles/lwdistempers/lwdistempers.htm
    http://www.buildingconservation.com/articles/awash/awash.html
    http://www.mikewye.co.uk/mikelimewashing.htm

    .. suggest flaking may be due to dusty surface, too dry surface or too thick layers of limewash.

    There are also mineral paints like Beeck or Keim that last longer. Maybe that's what was meant by 'clay'?

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