If I had my druthers, I'd insulate -- but not vapor barrier if the attic
space was over a room in the house because moisture (which vapor barrier
was meant to discourage) isn't an issue there. If the space is over
somewhere outdoors, unheated, or otherwise un-livable, then by all means
As for the gable end wall, "inaccessible" doesn't mean "unimportant"
when it comes to insulating. Any un-insulated space sucks out heat and
air conditioning, so if those two things have any importance to you
whatsoever, then insulate it.
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