[BLDG-SIM] thermal breaks for metal studs inside concrete walls

[John Ross]

JRR Wrote:

Take 3/8 inch fan fold foam insulation <homogeneous 2 lb blown strofoam>
in 4 ft by 50 ft packs and using 1x4 wood trim  cut to  ~24 inches nail 
through
the 1x4 oriented vertically to pin the foam against the wall.... just 
make sure
you miss the stud placements...

Preferably use 4 ft x 8 ft sheets of  1 inch Blue Board foam,  1x4 
horizontal
at top and bottom, for trim backing and vertically every 24 inches, and 
skip the
steel studs and the fiberglass. I've done this several times with 
concrete block.
Use cut nails 10p. I've never seen moisture problems with blue board but
have seen rot with below grade fglass batts......


Thomas White wrote:

> Greetings BLDG-SIMmers,
>  
> Has anyone run across an explanation/quantification of how an 
> effective thermal break might be provided for metal studs installed 
> for furring on the inside of existing concrete walls? 
>  
> An architect's detail from outside to inside, shows an existing 8" 
> concrete walls abutted against a 3-5/8" metal studs with furring 
> installed 24" o/c with batt insulation, and gyp board for the finished 
> side. The overall U-value is certainly a lot better than the bare 
> concrete, but it would be improved if the metal studs weren't in 
> direct contact with the concrete. 
>  
> Any thoughts on how to quantify this arrangements?
>  
> ...Tom
>  
> Thomas J. White, P.E.
> Associate
> Lead Engineer, Energy Services
> LEED(R) Accredited Professional
> 503.345.6246  |  twhite at glumac.com
>  
> Glumac
> 320 SW Washington, Suite 200
> Portland, OR 97204-2640
> T. 503.227.5280   F. 503.274.7674 
> http://www.glumac.com
>  
>
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