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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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Products: Eden Lime Insulation (lime/hemp/pumice) and use

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  1.  
    • CommentAuthorlaikipia
    • CommentTimeFeb 4th 2015 edited
     
    Has anyone come across or used this stuff? http://www.eden-lime-mortar.co.uk/html/eden_lime_insulation.html

    Sounds excellent - breathable, thermal conductivity of 0.113 so U value of 2.26 for a 50mm layer. With a 500mm wall with U value of 2.3 this would reduce the value by almost 50%.

    All the best
    John
    • CommentAuthorTriassic
    • CommentTimeFeb 4th 2015
     
    I've always loved lime mortar.
    • CommentAuthorringi
    • CommentTimeFeb 4th 2015
     
    What is in it to give the insulation?
    • CommentAuthorTriassic
    • CommentTimeFeb 4th 2015 edited
     
    Here's the calculation - http://www.eden-lime-mortar.co.uk/Solid%20Wall%20500mm%201.2%5B1%5D.pdf

    The layers appear to be 50mm lime plaster and 500mm of sandstone, giving a combined U-value of 1.2 W/m²K

    ringi asked "What is in it to give the insulation?" Answer - The thickness of the wall?
  5.  
    Triassic, I cannot imagine they would call it 'lime insulation' if it was only 50mm of lime mortar. It must have a lightweight aggregate, surely? However I cannot find any reference to its composition on their site. I was surprised at the suggestion of a U value of 2.3 for a 500 wall, but I do not know how sandstone performs compared to limestone or gritstone.

    Edit: One of my clients referred to ''lime/hemp/perlite insulation: Supplier Eden Lime''. Maybe that's the answer. Odd that (unless I have missed a reference) there is nothing about its composition on their site.
    • CommentAuthorTriassic
    • CommentTimeFeb 4th 2015
     
    The web site talks of mixing the 4 parts that make up the insulation, so yes it must be more than lime.
    • CommentAuthordocka
    • CommentTimeFeb 4th 2015
     
    Ive not used the lime insulation yet but have bought lime from Tim at Eden Lime. He's very helpful and passionate about lime, give him a call!
    No connection, other than being a satisfied customer.
    • CommentAuthorlaikipia
    • CommentTimeFeb 5th 2015
     
    Thanks for this advice. It seems it's lime with added hemp and pulverised pumice like material.
    • CommentAuthorlaikipia
    • CommentTimeFeb 5th 2015
     
    the area we wish to use this material is onto stone on the inside of two adjoining external walls of a bedroom. We will only be plastering from floor to ceiling and into window recesses. Will have an overlap onto the two attached internal walls.
    With this u-value need we worry at all about thermal bridging top and bottom and issues of joist end rot in the walls?
    • CommentAuthorTriassic
    • CommentTimeFeb 5th 2015
     
    I would have thought the lime would breath, so would not have thought joist rot would be an issue.
    • CommentAuthorringi
    • CommentTimeFeb 5th 2015
     
    Given how low the insulation is, I question if it is a good enough solution in most cases unless you are heating with free wood.
    • CommentAuthorlaikipia
    • CommentTimeMar 7th 2015 edited
     
    We have now spoken to the lime plasterer. He is quoting c. £75/sqm. That is for materials and labour. The insulating plaster needs building up in 2 layers to 50mm then finished so 3 visits in all. The material is c. £30/sqm for 50mm thickness. How does this seem as a price?
  13.  
    Depending on the m2 that you need covering you can buy the hemp lime and sand your self. The hemp lime plaster mix isnt anything special. Ive done projects with hemplime plasters on older buildings and always buy the materials separately. If there is quite a large area to do, hiring a render spray machine can really speed things up. Spraying it on is very easy and then just needs someone who knows how to use a feather edge. It can be done in 2 coats, floated flat and without a finish coat.
    •  
      CommentAuthorBauwer
    • CommentTimeMay 19th 2016 edited
     
    We are working with the forum administration in order to establish a separate Bauwer Sustainable Insulated Plaster and Render topic. It should be available shortly. That's would be the place to ask all the questions on Bauwer Plaster and Render solutions.

    Best regards, Alexander.
    • CommentAuthorEd Davies
    • CommentTimeMay 19th 2016
     

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