[GSBN] Drainage within a plaster system

[John Swearingen]

Sven...are you confusing "machine direction"?  Doesn't it refer to tension
in the plane of the material. The sandwich materials like this that I've
seen can all be pulled apart by hand (we do it regularly), and that doesn't
seem strong enough for a major seismic event...

John "Cross Machine" Swearingen
[image: Inline image 1]


On Wed, Jul 10, 2013 at 2:05 PM, Sarah Johnston <sarahjohnston at ihug.co.nz>wrote:

> 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<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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-- 
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
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