On Mon, 22 Nov 2010 19:46:55 -0800 (PST), Ivan Vegvary
wrote:

On Nov 22, 6:23*pm, mm wrote:
On Mon, 22 Nov 2010 17:17:41 -0800 (PST), Ivan Vegvary

wrote:
My attic will be insulated on November 30 of this year. *They will
blow in 24" of insulation.

From where? *The top?

Yes, from above. * * * * * *

If insulation won't get under any part of the ducts now, why would it
get under the ducts then? *Or do you mean that there will be a part
that is 6" high and 10 or 12 inches wide that will get insulation, and
the part just below the round duct won't? *Oh, it all will. *Then why
do think there will be no insulation undre the duct if you don't raise
the duct? *There will be no insulation under the very bottom of the
duct, but that is touching the ceiling downstairs and will warm it a
little.

The 12" ducts take up the whole joist cavity and the sides of the duct
are touching the abutting ceiling joist. Therefore, no blown
insulation will filter down into the two quarter-arcs on either side
of the joint.
However, as somebody else pointed out, the ducts should be closer to
room temperature and not attic (well vented) temperature. This would
argue for the ducts to stay close to the ceiling with lots of
insulation on top even though some will be missing at the lower areas.

How much are they charging you to blow the insulation in. Total
price, insulation and labor and whatever else.


Ivan Vegvary