I've got sheets of 2.5" XPS (R-15). I'm considering placing a layer
on top of the existing blown-in insulation.
Any idea if this is a safe/sensible thing to do? The XPS will be
supported by trusses and won't compress the blown-in insulation.
On Thu, 11 Mar 2010 07:24:13 -0800 (PST), Borrall Wonnell
If mold/mildew is of concern there should be one insulation barrier,
and that insulation barrier should be closest to the living quarter
planes in the attic space. Your insulation material above the
moisture barrier should allow water vapor to pass thorough it.
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