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DP Cellulose

Posted by JT on March 16th, 1998 07:19 PM
In reply to Dense Pack Cellulose Insulation by Alan Iroff on March 16th, 1998 10:35 AM [Go to top of thread]

3 of 3 people found this post helpful

Alan, yes he's correct. Air is the primary vehicle
of moisture transport. DPC stops air an thus moisture.
If any moisture does get in, the celluose will wick
it away from the framing and hold it. Hopefully the
assembly will be able to dry to the exterior and
or interior before the cellulose reaches capacity.
There should be no inside vapor barrier. Fiberglass
will just let air pass to the framing and moisture
will condense there.
Of course, things can go wrong. If
there is excessive moisture, eventually the cellulose
will reach capacity an damage can occur, but this
would happen with FG to, only much faster. Wet basements
or crawlspaces supply huge amounts of moisture which
must be mitigated. The other thing to be careful of
is a forced air heating system that pressurizes the
house (due to leakage in the return ducts); this
will drive moist air into the walls and eventually
overwhelm the DPC. But, again, with FG, it would
happen even more quickly. For more information,
spend some time reading the "Air-Infiltration" thread
over at This Old House BB (,
and visit

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