[Greenbuilding] Double-stud wall (was Re: Best bang for the buck in wall insulation)

[Clarke Olsen]

The problem with single top headers is that, when triaging the lumber, it's hard to find something you feel can be trusted up there all alone... 2x3 sounds better then it is: most of them are crap. The other reason to make the interior studs bearing is that you can keep the foundation back, leaving a very generous overhang to drip past the foam that covers your foundation. I used to think I was a hero for putting 2" of blueboard under the slab and against the foundation, until I noticed how nice & cool it was in summer...
Clarke Olsen
clarkeolsendesign.com
373 route 203
Spencertown, NY 12165 
USA
518-392-4640
colsen at taconic.net




On Mar 26, 2014, at 5:55 PM, RT <archilogic at yahoo.ca> wrote:

> On Wed, 26 Mar 2014 11:42:01 -0400, AA-man wrote:
> 
>> here's where I'm heading ...*OVE stud wall
>> *a void, width determined by specific space heat demand analysis
>> *an inner frame wall
>> *the entire framing cavity filled with DP cellulose
> 
> 
> The above sounds very much like a double-stud wall section so one should choose which of the two frame walls is load-bearing .
> 
> Logically, the interior wall would be the one designated as load-bearing even if only because doing so shortens the spans of flexural members like joists and rafters. When we're talking about fat superinsulated walls, the difference in span can mean a difference in one joist size.
> 
> In making the interior wall loadbearing, there's no need for the exterior wall to be a 2x6 OVE stud wall -- it can be a 2x3 or 2x4 wall with studs at 24" o/c, single top plates, no lintels over openings (assuming that we're talking about low-rise residential building)
> 
> One just needs to ensure that one allows for eventual shrinkage of cross-grain framing members (ie sill & top plates, rim joists, lintels) in the bearing wall so that the curtain wall does not inadvertantly become loadbearing.
> -- 
> === * ===
> Rob Tom					AOD257
> Kanata, Ontario, Canada
> 
> < A r c h i L o g i c  at  Y a h o o  dot  c a  >
> (manually winnow the chaff from my edress if you hit "reply")
> 
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