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Fundamentals: hydrated lime - how much

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      CommentAuthordjh
    • CommentTimeJan 29th 2013
     
    I have a simple question to which I've failed to find an answer.

    If you start from a 25 kg bag of hydrated lime, how much putty does that make?
    • CommentAuthorDarylP
    • CommentTimeJan 29th 2013
     
    depends on how much water you add to it?:bigsmile:
    •  
      CommentAuthorSteamyTea
    • CommentTimeJan 29th 2013
     
    will be 25kg when it is dry
    What is the density of it?
  4.  
    Or are you talking about volume when made up??:confused:
    • CommentAuthorseascape
    • CommentTimeJan 29th 2013
     
    Try calling Singleton Birch 01652 686000 or go on their website - under FAQs they give coverage rates for putty/mortar for 25kg bag hydraulic lime. I think they sell hydrated lime too so may be able to help you.
    • CommentAuthorTriassic
    • CommentTimeJan 29th 2013 edited
     
    25kg of dry lime plus the weight of water (kgs) = total weight of putty

    The putty should be a thickish paste, so add water until such time as you are happy with the pastyness of the end product.

    Hydrated Lime or ‘Bag Lime’ is non-hydraulic lime produced by slaking with a precise amount of water, driven off during the reaction to form a dry powder. It is inferior to lime putty and is often added to cement, also it is difficult to achieve a set.

    Hydrated lime is not as fine as lime putty and can carbonate in the bag. It is not suitable for use as a lime wash.

    So what are you using the resultant hydrated lime putty for?
    •  
      CommentAuthordjh
    • CommentTimeJan 29th 2013
     
    Posted By: seascapeTry calling Singleton Birch 01652 686000

    Thanks for the practical suggestion seascape! :bigsmile:

    Posted By: TriassicThe putty should be a thickish paste, so add water until such time as you are happy with the pastyness of the end product.

    I don't think it matters if you add too much water to putty. That's part of the point of it.

    Hydrated Lime or ‘Bag Lime’ is non-hydraulic lime produced by slaking with a precise amount of water, driven off during the reaction to form a dry powder. It is inferior to lime putty and is often added to cement, also it is difficult to achieve a set.

    I know what it is and can see why putty suppliers want to distinguish their product from it. If you have any independent references about quality or setting, that would be useful.

    Hydrated lime is not as fine as lime putty and can carbonate in the bag. It is not suitable for use as a lime wash.

    I'm aware of the carbonation problem and the need to buy fresh, undamaged bags. Since AFAIK lime putty is made either from lump lime or hydrated lime, I'm not sure how it would be less fine as long as the putty is properly aged?

    So what are you using the resultant hydrated lime putty for?

    I'm thinking about using it in render, though most likely not for the finish coat. There are obvious cost advantages (how much depends on how much putty it makes).
  8.  
    I believe Keith used it on his house. Old BFF article on it.
    • CommentAuthorTriassic
    • CommentTimeJan 30th 2013
     
    djh - Sorry to sound negative, I just wanted to make sure you were aware of the difference, which clearly you are.
    • CommentAuthormuddy
    • CommentTimeJan 30th 2013
     
    Have 2x 25l lidded tubs ready, half filled with clean water. Add the fresh hydrated lime to the water in smallish scoops using both tubs at the same time. you may need to add some more water. Make sure you finish with a layer of water over the soaking lime. Leave in a frostfree dark place for at least 3 months. This has worked for me for making limewash. The savings on buying lime putty are considerable, but you need to think ahead.
    •  
      CommentAuthordjh
    • CommentTimeJan 31st 2013
     
    Thanks all. Singleton Birch were very helpful, saying that it basically makes a bit less than quicklime, which makes 3.5 times the amount of putty as the dry lime. I also found some interesting details on Biff Vernon's site and the LILI site.

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