I have a second story room with a vaulted ceiling. The room is
difficult to heat and cool. During the winter snow melts off part of
the roof of the room while the rest of the house remains snow covered.
Only R-19 insulation was installed in the ceiling because that's all
that would fit, and that included furring strips to build out the
2xWhatever they are.
For the moment I decided to elliminate the vaulted ceiling and install
a standard 9 foot ceiling with R30 fiberglass bat insulation. I see no
reason to go beyond R30 since I already have R19 up there, plus the
additional dead air space created between the old and new ceiing.
So finally here are my questions:
Does anyone know of a better or least costly way of increasing the
insulation using the existing vaulted ceiling? Ripping down the
drywall to extend the rafters would be more costly than building a new
ceiling. I don't care about preserving the vaulted look. What I need
is something like foam insulation sheets, but something decorative.
I've seen insulation sheets at Home Depot with R-Values up to R20. If
they were decorative, maybe they could be glued to the existing
If I go the second ceiling route, should the insulation be with or
without a vapor barrier? Assuming the existing insulation has a vapor
barrier directed toward the room, is there a problem with a second
vapor barrier above the new ceiling on the conditioned room side?
Thanks for your comments.