[GSBN] Drainage within a plaster system

[John Swearingen]

We/ve used a similar product, with good success, by Benjamin Opdyke:
http://www.benjaminobdyke.com/visitor/subcategory/subc/rainscreenProducts.


We applied it more or less as Frank says:  we used a thick scratch (base)
coat of plaster over the bales, and then tied the rainscreen (Homeslicker
plus Typar) and light stucco lath onto the building with 14g wires through
the bales. The Typar stops the next plaster coat from filling the gap.
 This sounds more laborious than it was; it went pretty quickly. Then we
applied  a regular three-coat plaster, though a thick two-coat would also
work.  We used a custom flashing at the bottom of the bottom of the wall to
carry away the water.I see

This was in a highly exposed round tower sticking up through a tile roof, a
fairly challenging location that receives high winds and driving rain.
 We've gone through the first winter, including some hurricane force winds,
with no sign of leakage :)

John "Rain Skeemer" Swearingen


On Mon, Jul 8, 2013 at 2:04 PM, Frank Tettemer <frank at livingsol.com> 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
>
>
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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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