[Greenbuilding] blown-in cellulose: theory behind two holes per cavity?

[Reuben Deumling]

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.
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.

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?

The mesh I stapled between the cavities is working quite well to allow the
air blown in to escape/depressurize the cavity.

Thanks very much for any insights.

Reuben
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