According to Doug Miller :
In article , Goedjn wrote:
On 4 Nov 2005 11:34:00 -0800, wrote:

Use the loose fille insulation.

use 6" deep insulation, and squash it,

Not a good idea -- he'd probably wind up with a lower R-value than if he just
used R-11 insulation of the proper size. It's not the fiberglass that provides
insulation, it's the *air* trapped in it. Squash the air out of it, and you're
reducing its ability to insulate.

Unless you squash it really far, 6" R20 insulation will come out to about
R11 when stuck in a 4" wall. A waste of money, but the insulation value
is okay.

Either running cut batts sideways, or simply slicing a batt in half lengthways,
and putting it in side-by-each with a full batt will work with a more predictable
R-value, and not waste money.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.