Ed Clarke writes:
4x8 foot sheets of solid insulation. Cut them across the 4 foot side
in 19 inch widths. This will give you five pieces of 4'x19" insulation.

I don't know if this will work, up to code, etc, but what about
tacking the 4x8 sheet to the *bottom* of the joists leaving an air
gap?

I think this would significantly reduce air infiltration... especially
if you used a good seal where ther meet/terminate. (possible spray
foam?) you might be able to incorperate a radiant barrier as well.

Also, what are you doing for vapor barrier?
If you can get a continuous sheet it will also help with air
infiltration. Anyone know if it's not a good idea to use a single
large sheet which gets tucked up into the space before the insulation?
(kinda like wide accordian folds)

--
be safe.
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