[GSBN] Drainage within a plaster system

[Sarah Johnston]

Thank you all for your thoughts...

  The plaster keys into the geotextile and the geotextile is well  
bonded to the mat.  The specs say that the tensile strength (Machine  
Direction) is 7.5 KN/M for the mat with the geotextile bonded to both  
sides.  I do not know what this number equates to in potential  
thickness of plaster hanging on it....  Any thoughts anyone??

The secuDrain http://www.cirtex.co.nz/files/file/375/Std+Secudrain+131+C+WD+401+131+C%2C+Rev+5_en.pdf 
    does seem like it should be better and the specs suggest the  
tensile strength is twice as good as the duraflow.  The reason I have  
not been considering the secudrain over the duraflow is that the  
samples I have do not seem to reflect the data on the website.   The  
duraflow was far more difficult to pull apart..  I guess it all comes  
back to trying them both on a wall, then test them.

If we have living green walls like John suggests...  Would that make  
us 'greenies'?

Sven

On 11/07/2013, at 2:47 AM, John Swearingen wrote:

> 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
>
> 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
>
>
>
>
>





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