<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<div class="moz-cite-prefix"> So, densepack cellulose is supposed
to be 3.5# ft3 or greater. 3.2# is probably ok for 2x4 walls. I
saw a chart (from denmark) at the 2012 ACI conference in
Baltimore. It showed that as a wall got thicker (2x6, 2x8 etc.)
that you need a higher density to prevent settling. Excessive
height would likely require greater density too.<br>
At 2.4# ft3 you are way too low, using 2, or more holes may
get you a little extra density. But the problem is that your
machine does not have enough umph. You need a minimum of 2.9psi or
80iwc of pressure at the machine outlet to install densepack. You
may need to replace the airlock seals, or completely rebuild the
airlock.<br>
My 20 year old force2 with a rebuilt airlock and a new blower
can now do densepack, but the newer machines have more powerful
blowers (and some multiple) and can do it faster & easier.
Intec's new Turbo Force HP can put out 6.9psi!<br>
<br>
<br>
<br>
On 8/21/2013 10:32 PM, Reuben Deumling wrote:<br>
</div>
<blockquote
cite="mid:CAE5fceDOZZvgvQevEbD06e7RANAcM=d2Fv-XAXm_Qj8d7-Q=pA@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>
<div>
<div>
<div>
<div>I'll admit I'm not a regular at this task. To date
I've chiefly blown cellulose into open cavities from
the outside. It worked great and I achieved the
desired 3.2+ lbs./cu ft without any heroics. <br>
</div>
Now I'm blowing cellulose into somewhat odd-shaped
cavities that have plywood faces on the inside and out.
The cavities, as mentioned here recently, are about 5'
tall and 10" thick with plywood gussets connecting the
interior 2x6 walls with the exterior 2x4 walls. These
knee walls project out beyond the 2x4 walls of the house
above, leaving a convenient shelf on top through which
to drill 80 holes and blow insulation. So far so good.
But so far I'm only achieving about 2.4 lbs/cu.ft. I
inserted my flexible 1.5" vinyl hose to the bottom of
the cavity and retracted it as it filled/stopped
blowing. My ability to move the hose about at that
extension is limited however, and so I'm not really that
surprised that the desired dense pack density has
remained elusive. <br>
<br>
</div>
So my question: would it make sense to drill a second set
of holes near the bottom and attempt to blow more into the
~lower third of the now partially filled cavities? I'm not
clear on the purpose of having two holes per cavity. I am
assuming it allows the hose to reach more places within
the three dimensional space and therefore achieve higher
density, yes? <br>
<br>
</div>
The mesh I stapled between the cavities is working quite
well to allow the air blown in to escape/depressurize the
cavity. <br>
<br>
</div>
Thanks very much for any insights. <br>
<br>
</div>
Reuben<br>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Greenbuilding mailing list
to Send a Message to the list, use the email address
<a class="moz-txt-link-abbreviated" href="mailto:Greenbuilding@bioenergylists.org">Greenbuilding@bioenergylists.org</a>
to UNSUBSCRIBE or Change your List Settings use the web page
<a class="moz-txt-link-freetext" href="http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org">http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org</a></pre>
</blockquote>
<br>
<br>
<div class="moz-signature">-- <br>
George J. Nesbitt, Environmental Design / Build, Building
Performance Contractor, HERS I Verifier & HERS II Rater,
GreenPoint Rater new & existing SF & MF, CABEC CEPE
(Certified Energy Plans Examiner), Certified Passive House
Consultant, BPI Multifamily Analyst, <a class="moz-txt-link-abbreviated" href="http://www.houseisasystem.com">www.houseisasystem.com</a>, (510)
655-8532 office, (510) 984-8344 mobile</div>
</body>
</html>