[GSBN] OSB inside walls

[Bob Theis]

I second Anni’s points and add that the shrinking and swelling of  the OSB is likely to telegraph to the surface of the veneer plaster. 

Bob Theis

> On Aug 19, 2024, at 3:18 PM, Anni Tilt <anni at arkintilt.com> wrote:
> 
> Hi there
> 
> In general we don’t use OSB adjacent to straw bale walls as they are not very breathable (note that we have used plywood, which has a higher perm rating, on the interior of a hybrid bale-insulated frame wall).  Additionally, OSB tends to off-gas - not good in an interior environment.  
> I don’t know about the specific coating being proposed on the interior, but a clay paint might be easy and  low cost (although perhaps not as durable). 
> 
> Or might I suggest having a workshop to have plasterers join from around the world - plastering destination vacations!  I might even consider signing up! 
> 
> best
> Anni Tilt
> 
> Arkin Tilt Architects  Ecological Planning & Design
> 							1101 8th Street, #180
> 							Berkeley, CA 94710
> 							510.528.9830
> 							510.418.9788 mobile
> 							www.arkintilt.com <http://www.arkintilt.com/>
> 
>> On Aug 19, 2024, at 2:10 PM, Van Krieken <vankrieken at gmail.com> wrote:
>> 
>> Hi
>> 
>> In the picture you see the prefab strawbale walls she is covering with OSB.
>> I allways recomend to cover those walls wuth clay,  but in this case the owner decided to use OSB.
>> 
>> 
>> A segunda, 19/08/2024, 20:57, Dave Howorth <dave at howorth.org.uk <mailto:dave at howorth.org.uk>> escreveu:
>>> On Mon, 19 Aug 2024 16:03:14 +0100
>>> Van Krieken <vankrieken at gmail.com <mailto:vankrieken at gmail.com>> wrote:
>>> 
>>> > Hello everyone,
>>> > I have a friend who is building a house with prefabricated straw bale
>>> > walls, but she is having a lot of trouble finding available labor for
>>> > the clay plastering. So, instead of plastering the interior walls
>>> > with clay, she decided to cover them with 12mm OSB boards and then
>>> > apply a thin plaster made of marble dust, clay, and lime.
>>> > 
>>> > I visited the house on a very hot day and was surprised by how cool
>>> > the walls were, which means the thermal inertia is working well.
>>> > 
>>> > On the exterior, she covered the straw bale walls with wood fiber
>>> > insulation boards, plastered them with 10mm of NHL, and then applied
>>> > sprayed cork, which means the wall 'breathes' well through that layer.
>>> > 
>>> > What is your opinion on placing OSB on the interior side of the
>>> > exterior walls?
>>> 
>>> I'm a little confused by your question. What is on the inside of the
>>> prefabricated straw bale walls as installed? And what is shown in the
>>> pictures?
>>> 
>>> > Jorge Van Krieken
>>> > 
>>> > Green Heritage - Portugal
>>> 
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