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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.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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  1.  
    I have a brick built outhouse that gets damp from a retaining wall behind it. I think I've done what I can without getting into drainage channels, so I've limewashed the walls to limit mould growth. On the worst bits, it isn't getting dry enough to dry fully, even with a dehumidifier in there (2 days without one, then three with so far).

    Will the limewash stay on alright if it doesn't dry out fully, or is it worth pursuing drying it fully once, before it inevitably gets damp again through the winter?
  2.  
    I would have gone for a paint-on tanking slurry, usually 2 coats, the second at right angles to the first. Ideal solution for high ground against a wall. Our 2 last places had this as the solution.
  3.  
    Posted By: Dominic CooneyI would have gone for a paint-on tanking slurry, usually 2 coats, the second at right angles to the first. Ideal solution for high ground against a wall. Our 2 last places had this as the solution.


    I did consider that route, but it's connected to a garage that's been built into the house and I thought there was a risk that tanking the outhouse would force more water into the garage. So I'm sacrificing the outhouse to save the garage! I don't know if that was the right call, but now its limewashed so I'd like to give that route a try.
  4.  
    Ironically it may even stay on better if a bit tacky. If it dries completely it may tend to flake anyway.
  5.  
    Posted By: Nick ParsonsIronically it may even stay on better if a bit tacky. If it dries completely it may tend to flake anyway.


    That's good to know, thanks very much. I'll turn the dehumidifier off then!
  6.  
    Limewash actually 'goes off' in reaction to CO2
    so in theory it can go off wet, eventually.
    The usual adivce is several thin coats that go off between coats.
    whether those coats actually go off, or just dry out enough to be stable, is a research project in itself!
  7.  
    Thanks Dominic! I should have pointed that out. Also, OP, even if it stays on the wall you will bring it off on your clothes every time you go in!
    •  
      CommentAuthordjh
    • CommentTimeSep 21st 2023
     
    Posted By: Dominic CooneyLimewash actually 'goes off' in reaction to CO2
    so in theory it can go off wet, eventually.
    Limewash is generally made from fat lime, which does not go off under water - you can keep lime putty for years. Hydraulic lime is so named because it *does* go off underwater. Fat lime is sprayed (misted) with water for a few weeks after application to slow down the rate of carbonation.
  8.  
    Posted By: djh
    Posted By: Dominic CooneyLimewash actually 'goes off' in reaction to CO2
    so in theory it can go off wet, eventually.
    Limewash is generally made from fat lime, which does not go off under water - you can keep lime putty for years. Hydraulic lime is so named because it *does* go off underwater. Fat lime is sprayed (misted) with water for a few weeks after application to slow down the rate of carbonation.


    That's helpful to clarify, thanks. This is made of fat lime (from putty).
  9.  
    In your application it will depend if it gets dry enough seasonally to go off, before it gets rubbed off on peoples clothing. Drying and carbonation are not the same process.
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