[GSBN] OSB inside walls

[Anni Tilt]

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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