[GSBN] Drainage within a plaster system

[John Swearingen]

The drainage mat is very thin, and I'm not understanding how you plan to
"embed" the mat to the base coat, and then bond the exterior plaster to the
geotextile, both securely enough to keep the plaster layer from falling off
in a good shake?  BTW, I would consider using their "SecuDrain" rather than
Duraflow especially if you can get it with geotextile on one side only.

Have you thought of wrapping the building in something like DuraGreen?
 Never mind the plaster, grow plants.

John


On Wed, Jul 10, 2013 at 2:33 AM, Sarah Johnston <sarahjohnston at ihug.co.nz>wrote:

>  My intention would be to apply a 30mm clay/sand/straw plaster with this
> product embedded into/ onto the top of the plaster.  Or 20mm of
> lime/cement/ sand/ fibre plaster in place of the clay.  This would be the
> typical structural plaster and the thin plaster over the drainage mat would
> be to visually hide the mat and stop the wind from driving rain through the
> mat, thus adding to the typical plaster rather than weakening the system.
>
> I am hoping this product would be robust enough to be able to hang the
> thin plaster on it with no wires creating any potential weakness in the
> weather tightness of the plaster system.  Due to the legal climate in NZ,
> the engineering is achieved by means other than the plaster system, cross
> bracing etc.  While the plaster is not considered to be structural, the
> system will be exposed to seismic activity due to the fact that
> Christchurch is still experiencing pretty good shakes on a regular basis.
>  (There have actually been over 11,000 shakes of 2.0 or more since the 'big
> one' three years ago)!  Do these engineering numbers support my hope???
>
>  http://www.cirtex.co.nz/files/**file/663/Duraflow+GNG+700+**
> Series+Data+Sheet.pdf<http://www.cirtex.co.nz/files/file/663/Duraflow+GNG+700+Series+Data+Sheet.pdf>
>
> As this drainage mat  is in addition to a fairly typical plaster system I
> am hoping the small amount of moisture which could potentially find its way
> through the outer plaster, across the drainage gap and into the typical
> plaster system would not be enough to become any issue with no typar type
> product.  I just need to find out how to get a sample big enough to test....
>
> I look forward to reading through more of your "ranting and raving on this
> topic," John. and any other input would be great!
>
> Sven Johnston
> Sol Design Ltd
> www.soldesign.co.nz
>
>
>
> On 9/07/2013, at 9:04 AM, Frank Tettemer wrote:
>
>  Hi Sven,
>>
>> While this flexible drainage plain may well provide the needed path for
>> intrusive water, and allow drainage from within the wall plaster,
>> would it not also prevent bonding of the render to the straw bales in the
>> wall assembly?
>>
>> I'm imagining a 'brown' coat of plaster, worked into the exterior of the
>> bales, and the application of the Duraflow material to this first plaster
>> coat, while it is still wet and workable. Then the second coat of plaster
>> covers the Duraflow material, yes?
>>
>> Would this compromise the structural needs of the outer skin, in it's
>> function for structural engineering and seismic resiliency?
>>
>> Or, to say it all a different way:
>> Wouldn't the use of the Duraflow weaken the strength of the wall assembly?
>>
>> --
>> Frank Tettemer
>> Living Sol ~ Building and Design
>> www.livingsol.com
>> 613 756 3884
>>
>> ______________________________**_________________
>> GSBN mailing list
>> GSBN at sustainablesources.com
>> http://sustainablesources.com/**mailman/listinfo.cgi/GSBN<http://sustainablesources.com/mailman/listinfo.cgi/GSBN>
>>
>
> Sarah Johnston
> Sol Design, Ltd.
> 50A Connolly Street
> Geraldine New Zealand
> 03 693 7369
> sarahjohnston at ihug.co.nz
>
>
>
>
>
> ______________________________**_________________
> GSBN mailing list
> GSBN at sustainablesources.com
> http://sustainablesources.com/**mailman/listinfo.cgi/GSBN<http://sustainablesources.com/mailman/listinfo.cgi/GSBN>
>



-- 
John Swearingen
Skillful Means Design & Construction
2550 9th Street   Suite 209A
Berkeley, CA   94710
510.849.1800 phone
510.849.1900 fax

Web Site:  http://www.skillful-means.com
Blog:         https://skillfulmeansdesign.wordpress.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.sustainablesources.com/pipermail/gsbn/attachments/20130710/eb364b9d/attachment.htm>