[Greenbuilding] Building w/in a building

[Joe Killian]

Kurt,
   If you trust your metal siding to keep water out, I'd suggest 
attaching the 2x6 wall to the girts and having no vapor barrier.
   If you only trust it to keep most water out, I'd suggest the drainage 
plane between the 2X6 wall & girts, but still no vapor barrier.
   You want the wall to be able to dry from any condensation, and it 
won't likely dry well through the metal siding.
   See
http://www.buildingscience.com/documents/digests/bsd-106-understanding-vapor-barriers

Joe

On 7/5/2014 3:36 PM, Kurt Jensen wrote:
> Hi all,
> I am working on insulating a pole barn. Currently, the building has 
> 1.5 inch EPS glued to the ribbed metal siding, between the girts and 
> purlins.
> The project is in the Pacific Northwest and the owner wants the 
> building very well insulated. The floor is concrete slab. I'm thinking 
> of framing 2x6 walls inside the existing building and insulating the 
> wood walls with cellulose. My concerns have to do with trapping 
> moisture. Since we have a fairly mild climate, but a lot of moisture 
> issues, vapor barriers are often not used. I'm thinking of typical 
> framing of OSB and moisture barrier to outside of the 2x6 walls and 
> sheetrock on inside. My question is, should I leaving an inch or so 
> space between 2x6 wall and the insulated barn wall or attach inside 
> wall directly to girts? Anybody done anything like this or seen it 
> done? Thanks
>
> -- 
> Kurt Jensen
> Willamette Valley, Oregon.
>
>
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