[Greenbuilding] FW: How green is cellulose infill? / thermal bridging?

[Corwyn]

On Jul 10, 2006, at 17:24, Alan Abrams wrote:
> Hmmmm, anyone have any hard data on this issue of thermal bridging?  My
> guess is that what is observed (in infrared photography, etc) is to a 
> large
> extent convection along the edge of fiberglass batts.  How much heat 
> does a
> 2x6 actually conduct, particularly if it's snugly insulated, say, with
> cellulose or sprayed in place polyurethane?  What is the moisture 
> content of
> wood members, when tested for thermal performance, compared to a stud 
> that
> lives in a thoroughly dried out wall cavity?  Is wood getting a bad 
> rap,
> thermally speaking?

A 2x6  is about R-6.8 (edgewise) counting just the wood  (i.e. not in a 
wall at all).

An article on whole wall thermal performance can be found at:
http://www.ornl.gov/sci/roofs+walls/whole_wall/

Thank You Kindly,

Corwyn


-- 
Corwyn
Kermit didn't know the half of it...
http://www.greenfret.com/
corwyn at greenfret.com