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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Housing - Renovation: Lime Floor as Final Finish

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    Morning all,

    I would like to install a Limecrete floor through the current building - as an old building with no damp coursing, common sense tells me a solid slab will just push any damp out and up the walls giving me much bother in the future.

    This will also take UFH. What I really wanted was a concrete like floor finish. Has anyone done similar with Lime; any issues with staining or dusting?

    Thank you
    • CommentAuthorgyrogear
    • CommentTimeJun 28th 2020
     
    Posted By: rosecottageHas anyone done similar with Lime; any issues with staining or dusting?


    (1) Yes !

    (2) No !

    gg
    •  
      CommentAuthordjh
    • CommentTimeJun 29th 2020
     
    I think I'd like to see some further explanation from gg since google shows various pages saying "polished limecrete is not the same as polished concrete" and suchlike.

    Also I suspect rosecottage would like a little more detail than a one word answer to the question of how to avoid dusting etc.
  4.  
    NHL5 goes off very hard, we used it in the limecrete slab that we did in a cottage renovation. We didn't polish it, but it went off really firm. We used crushed pumice as the aggregate which added to the insulation value of the slab. On top of the slab UFH pipes were cable tied to reinforcing mesh and then set in a lime screed with crushed recycled glass as the sharp sand. (all came from Ty-Mawr if I recall). Blue brick (in one room) & stone flag (in the other room) floor on top for the final surface - the original floors that were taken up for re-laying.

    I expect that with a trowelled finish, the screed mix would come up with a concrete-like finish that is hard enough for a domestic situation. Perhaps make a test panel in a wooden box / bread crate? and see what you think. It should go even harder over time as it calcifies (not sure if this is the correct term?). Regarding dusting and staining you might have to seal the surface but then that might make it less breathable. From what I recall, we used up some left over bags of NHL5 for lime plastering with a sharp sand mix and it went off incredibly hard.
  5.  
    Here is a picture. UFH pipes went on top of this, then screed etc.
      limecrete slab.JPG
  6.  
    I did quite a lot of research into this, but couldn't find a straight answer. However, having laid a couple of lime screeds, my view is that an NHL5 screed would be polish up quite like concrete. Ours dusted, but I think you can get a breathable sealant.

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