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

[RT]

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

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