Lime Render

Discussion in 'Builders' Talk' started by dubsie, Oct 15, 2018.

  1. dubsie

    dubsie Active Member

    Does anyone know the ratio for lime render / plasters

    Scratch Coat
    Base Coat
    Finish Coat

    Help much appreciated.
     
  2. Richard_

    Richard_ Screwfix Select

    I love lime render, primarily because it goes off slowly so you can lovingly rub it down to a smooth surface. Plus the breathability and flexability benefits.

    It's not like mixing cement, you're are best to use a lime putty, especially on heritage buildings or natural construction. So that means buying in ready mix.

    As long as you keep it wet and covered with plastic then it'll last forever. Actually older is better, although you should use it within a few weeks if it has fibres ( hair /hemp/straw) because they do rot in the lime.

    It also benefits from a good 10 min in a mixer to get it nice and plastic so it is workable.

    Having said that... Lime Green do a good powered mix. I've used their finish coats on top of ready mix. https://www.lime-green.co.uk/products/lime-render
     
  3. Dam0n

    Dam0n Screwfix Select

    You can also make a lime putty by mixing hydrated (hydrated not hydraulic. Don't get these mixed up) lime with water until it gets to a toothpaste consistency. Cover the top with a couple of inches of water and let it mature for 6 weeks or longer.

    Then mix it with sharp sand. 3sand to one lime.

    Add horse hair for the first coat.
     
  4. Richard_

    Richard_ Screwfix Select

    It's meant to be a weaker mix on successive coats.
     
  5. Dam0n

    Dam0n Screwfix Select

    I've always used 3-1 and then a 5-2 on any finishing coats. A million ways to do things with lime. Alot of people use marble dust for their finishing coat etc
     
    KIAB likes this.
  6. stuart44

    stuart44 Screwfix Select

    It's usually weaker coats with cement/sand render, but on 3 coat lime work a spread I know who does a lot of lime plastering uses 3/1 sand/lime on the first 2 and then 1/1 or even 1/2 sand/lime on the top coat depending on the type of sand used,
     
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  7. KIAB

    KIAB Super Member

    Buy it in a bag, a lot easier nowadays,& Lime Green top coat is a darn nice product to use.

    A lot of peeps use Adfill fibres or Fibremesh 150 instead of horse hair nowadays, you can buy lime plaster with fibres added,called Fibrelime.

    https://www.lime.org.uk/products/lime/plasters-renders/fibrelime.html

    http://www.stastier.co.uk/nhl/guides/plasnhl.htm
     
    Last edited: Oct 16, 2018
    Richard_ and Dam0n like this.
  8. dubsie

    dubsie Active Member

    Thanks for the replies, I'll probably buy some ready mix by the sounds of it. I don't think we have any suppliers in Derby so I'll have to look further afield.
     
  9. Richard_

    Richard_ Screwfix Select

    I use http://www.womersleys.co.uk/ They are based in Dewsbury but delivery is on a pallet carrier at a flat rate so the distance is irrelevant. You need a drop off where the stuff can be wheeled on a pallet trolley from the kerb.

    I you are rendering then you need to get a move on, it needs to be frost free for 6-8 weeks while it cures .... and it cures slower when it is colder!
     
    KIAB likes this.
  10. KIAB

    KIAB Super Member

    Cutting it very fine.
     

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