[Cob] Coblist Digest, Vol 10, Issue 58

[Bernhard Masterson]

Hi Ziggy,  There isn't any problem creating a visual line on a wall where one plaster ends and another begins.  Just another "cold joint".  I would recommend making it a lap joint with several inches of overlap with the earth plaster lapping over the lime.  That way if/when the earth plaster gets wet it won't wick under the lime and cause the lime plaster to release.  Earthen plaster swells and shrinks with moisture, whereas lime is very stable.

- Bernhard 



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____________________________________http://bernhardmasterson.com

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> 
> Message: 1
> Date: Fri, 29 Jun 2012 17:23:18 -0500
> From: Brian Ziggy <evacindustry at gmail.com>
> To: coblist at deatech.com
> Subject: [Cob] Dealing with seams between lime and earthen plasters?
> Message-ID:
> 	<CABUX4XjHQGXEmZ1MB2k6cXBS99VWcaoOBOHXRtuy9cS=7mj9rA at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
> 
> Hiya all:
> 
> I am in the process of designing our plaster selection for our new timber
> frame & straw bale home. I have not done extensive lime plaster work
> before. We'd like to do a mix of lime and earth on the exterior, or
> different plasters depending on the individual susceptibility of each wall
> to rain damage.
> 
> I'm doubtful of how well a seam between earth and lime plasters would do.
> Has anyone ever plastered with earth and lime on the same wall with a seam?
> 
> - ziggy