so does that mean I cannot put fiberglass over the rock wool since
it's encased in plastic? Do I need to rip it down? This is in a Cape
Cod so the insulation is hanging from the gables. I'm just concerned
that 3" of rock wool is not an efficient amount of insulation.
They just did this on one of the home shows - Ask This Old House? There
was already a moisture
barrier, so they put fiberglass (six inch thick) crossways across the
rafters with no additional barrier.
The show was on in the past month or so.
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