[GSBN] Drainage within a plaster system

[Misha Rauchwerger]

I'd be concerned about the use of a non-permeable sheet on the outside of
natural wall systems that need to breathe.  Especially on residential
construction where so much moisture is generated on the inside of
buildings.  What's wrong with lime plasters that are quite hydrophobic, yet
still permeable?  Can the moisture migrate out through these rain screens?

Misha Rauchwerger
www.builtinbliss.com


On Mon, Jul 8, 2013 at 9:15 PM, John Swearingen <
jswearingen at skillful-means.com> wrote:

> Call me anything you like!
>
> The structural element is at the scratch coat...the bales are wrapped with
> 2x2x14g ww mesh, and the scratch coat is thick.  So outside of that, the
> rainscreen/lath/plaster assembly is weatherproofing.
>
> John
>
>
> On Mon, Jul 8, 2013 at 6:53 PM, Frank Tettemer <frank at livingsol.com>wrote:
>
>> This is so embarrassing!
>> I did NOT mean to write that John is "just" a builder.
>> I meant to write that I am just a builder. I am also feeling "just
>> humiliated".
>> (Always proof-read what you've typed, Frank, before pressing Send.)
>>
>> You are way over-qualified for that designation, and my appologees to you,
>> John "Much More than Just a Builder" Swearington.
>>
>> Regretfully Embarrassed Frank
>>
>> ..............................**..............................**
>> ..............................**..............
>>
>> An hour ago, Frank Tettemer wrote:
>> I really like what you're doing with this, John!
>>
>> The stitching of 14g wires answers all my concerns of the outer layer of
>> render flaking off, or pulling away from the structure.
>> And I imagine that this stitching would also reinforce the lateral
>> resistance of the plaster, when it's ask to act as a wind bracing,
>> and when it's contributing to seismic resilience.
>>
>> Would any Engineers on the list want to confirm this? John and I are just
>> builders, after all, and speaking for myself, I'm only qualified for
>> driving nails, not engineering.
>> (other than "intuitive engineering".
>> I _may_ be qualified for that.).
>>
>> Frank
>> ..............................**..............................**
>> ..............................**..............................
>> John Rain Skeemer Swearington wrote:
>>
>> We/ve used a similar product, with good success, by Benjamin Opdyke:
>> http://www.benjaminobdyke.com/**visitor/subcategory/subc/**
>> rainscreenProducts<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
>>
>>
>> --
>> 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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