[GSBN] lime over hessien/ Cement Lime.

Misha Rauchwerger misha.rauchwerger at gmail.com
Tue Apr 29 10:05:26 CDT 2014


We used a Natural Hydraulic Lime on straw bale mix of 1:2:9
(cement:Lime:sand) with good results

Misha Rauchwerger
BuiltInBliss.com








On Fri, Apr 25, 2014 at 11:04 AM, Sarah Johnston <sol_design at yahoo.com>wrote:

> Thank you to all who gave input on this subject!
>
> Further talks with the client have led to a full vented cavity for this
> project which means there is no Hessian involved any more.  They want to
> hang plaster on the exterior so they will still be having some challenges
> in their conditions but the straw will be well protected even if they have
> plaster failures.
>
> What mixes for lime cement are people using?  I believe Chris Magwood has
> gone as far as a 1 cement 3 lime and achieved good results.  Are others
> getting positive, durable results from mixes with low cement ratios?
>
>  Sven Johnston
> Sol Design, Ltd.
> 50A Connolly Street
> Geraldine 7930  New Zealand
> 03 693 7369
> sol_design at yahoo.com
> www.soldesign.co.nz
>
>   ------------------------------
>  *From:* Derek Stearns Roff <derek at unm.edu>
> *To:* Global Straw Building Network <GSBN at sustainablesources.com>
> *Sent:* Wednesday, 23 April 2014 9:44 AM
> *Subject:* Re: [GSBN] lime over hessien
>
> I’m thinking that a two-story house that routinely faces 100km/hr winds
> isn’t the location where I would like to be gambling.  Many people posting
> have indicated that the clay plaster to lime plaster interface is a point
> of uncertainty.  There may not be an approach that is both inexpensive and
> reliable.  Building a ventilated rain screen system for the whole wall
> system would be expensive, but has the potential to be reliable.  Using
> only lime plaster would be more expensive than applying a body coat of
> clay, but it would increase my confidence.
>
>  Andy Horn prepared a very interesting PDF on a lime/clay/dung plaster
> that was in use 100 years ago in South Africa.  He has pictures that
> document great weather resistance in weather-exposed uses.  Recent postings
> from Deva and Harry Francis via Rob Tom point out that applying lime
> plaster on top of clay/lime plaster may be more reliable than lime over
> clay.  Perhaps lime plaster over Andy Horn’s lime/clay/dung plaster would
> be worth some testing.
>
>  Two years ago, I posted Andy's 2 MB PDF on the site of the 2012 ISBC,
> but I’m not sure if it is still available.  The link below will let you
> download it, if you are interested.  I will leave this link up for a couple
> of weeks.
>
>
> https://www.dropbox.com/s/o42bruzrxim5cc5/Andy%20Horn%20Herbert%20Lime-Dung%20Plaster.pdf
>
>  Derek
>
>  On Apr 22, 2014, at 10:02 AM, Kyle Holzhueter <
> nihondaigaku.kairu at gmail.com> wrote:
>
>    Hello,
>
> In Japan, there is a several hundred year history of applying Shikkui lime
> plaster over earthen walls. Further details are available at the links
> below, but I wanted to point out a couple prominent features:
>  1. Addition of seaweed glue to improve adhesion and moisture retention
>  2. Minimal sand is used, which reduces the weight of the plaster and
> improves adhesion to the earthen plaster.
>  3. Addition of hemp fibers to improve flexibility and bending strength
>  4. Depending on the level of exposure, Shikkui finishes are expected to
> last about 20 years. Exposed walls will experience delamination earlier,
> protected walls will stay in good condition much longer. In this sense, the
> Shikkui finish is a kind of sacrificial layer.
>
>  You might find the following links helpful:
>
> http://japaneseplastering.blogspot.jp/2014/02/shikkui-plaster-mixing-and-application.html
> http://japaneseplastering.blogspot.jp/p/blog-page_25.html
>
>  Yours in mud,
>  Kyle
>
>
> Derek Roff
> derek at unm.edu
>
>
>
>
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