I have existing (probably R13) fiberglass batts in my attic and would
like to add to it. Problem is a lot of it has been disturbed over the
years. The other problem is my air handler is up there and there are
ducts running all over the floor. Is additional R19-or-so unfaced
fiberglass the way to go? Or, is blown-in cellulose on top of the
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I don't know if it's the best way to do it, but I have an acquaintance who
installed new joists perpendicular to and on top of the existing joists in
the attic. Additional unfaced fiberglass was installed between these new
joists, on top of the existing insulation. This framing was fitted around
AC equipment and ducts. It was strictly a homeowner DIY job.
There's no point in adding extra framing, unless you want to walk up there,
or use the space for storage. Without more details, I'd say the easiest
this would be to
(A) Make sure you don't block any soffit vents,
(B) Don't bury any junction boxes that you can't get to from the other side,
(C)Make sure the ducts don't leak. If the air handler does AC as well
as hot air, check with your HVAC company about how/whether to
insulate them separately.
(D) Lay fiberglass batting over the existing insulation, and pack it in,
and over the ductwork.
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