Twenty years from now, when fuel
prices are substantially higher, it will
be relatively easy to go back and add
some more insulation in the attic. Perhaps
it will be less simple, but possible,
to improve the foundation Rvalue,
and windows could be
upgraded, by replacement if necessary.
The toughest area to improve will be
the walls.
The options for walls will likely be
the same as those available today,
forcing the removal and replacement
of siding, or the destruction and renovation
of the interior of the shell.
Because this component is the most
difficult and costly to improve later, I
build R-30+ walls and thus I'm always
in search of the elusive "easy" way to
do this.
If one