[BLDG-SIM] blown-in cellulose vs batt insulation

[Steven Gates]

It also depends on how it was installed.  I have blown rock-wool installed
in the walls of my house.  It is installed in the same manner as blown
cellulose. It has a high R-value, and its heavier mass is great for
dampening sound transmission.

However, after the sheet rock guys were done for the day, I noticed a pile
of rock wool over in a corner.  Obviously, the insulation had fallen out of
one or more wall cavities.  

I don't know if blown-in cellulose is any more stable.  In any case, if I
were to do it over again, I would have a roll of fiberglass insulation on
site so that any loss could be replaced before the wall is closed in.

Steve Gates

-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of John Ross
Sent: Wednesday, June 27, 2007 1:51 PM
To: BLDG-SIM at gard.com
Cc: BLDG-SIM at gard.com
Subject: [BLDG-SIM] blown-in cellulose vs batt insulation

Jeff Haberl wrote:

>FYI. 
>
>There are also the PhD Theses by Sovik Bhattachara and Mingshing Liu from
Texas A&M, both of these have one or more ASHRAE papers, and are based on
laboratory results. Also, Joe Lstiburek has been studying this issue...and
may have some reports as well. Bottom line, the "effective u-value" can vary
significantly, and is influenced building pressureization/depressurization,
mode (heat or cool), and exposure to incident solar radiation. 
>
>Jeff
>BB 8=!  8=)  :=)  8=)  ;=)  8=)  8=(  8=)  :=')  8=)  8=)  8=? BB
>
>Jeff S. Haberl, Ph.D., P.E.............................jhaberl at esl.tamu.edu
>
>Professor......................................................Office Ph:
979-845-6507
>
>Department of Architecture.......................Lab Ph: 979-845-6065 
>
>Energy Systems Laboratory.......................FAX: 979-862-2457 
>
>Texas A&M University..............................77843-3581
>
>College Station, Texas, USA.......................URL: www-esl.tamu.edu
>
>BB 8=/  8=)  :=)  8=)  ;=)  8=)  8=()  8=) 8=?  8=)  8=)  8= BB
> 
>
>----- Original Message -----
>From: BLDG-SIM at gard.com <BLDG-SIM at gard.com>
>To: BLDG-SIM at gard.com <BLDG-SIM at gard.com>
>Sent: Wed Jun 20 10:28:59 2007
>Subject: [BLDG-SIM] blown-in cellulose vs batt insulation
>
>Hi all, 
>
>Does anyone know of published measured data comparing infiltration rates
with batt versus wet blown-in cellulose insulation in a stud cavity?  I have
one study by David Yuill that was very informative, but I'd like to find
some additional sources. 
>
>Thanks, 
>Aleka 
>
>  
>
Please give us the complete citation for     David Yuill    thanks......

jrr



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