490sq.ft. Attic, square shaped with chimney in center. Previous owners lai
d down different types of insulation - blown-in fiber(2-4"), One side vapor
barrier fiberglass(4" - R11?) on top of that. Portion of attic under hig
hest roof is decked over(about 200 sq ft) so I have no idea how much/what i
s under there.
We live in southern CT - R38 territory.
What are my options: Remove everything, pull up center deck, and throw in
12" vapor-backed fiberglass batts for entire attic, and blown in under deck
I personally don't want to put more insulation on top of insulation, just w
ant to start over and do it right.
On Wednesday, August 6, 2014 7:12:58 PM UTC-4, email@example.com wrote:
aid down different types of insulation - blown-in fiber(2-4"), One side vap
or barrier fiberglass(4" - R11?) on top of that. Portion of attic under h
ighest roof is decked over(about 200 sq ft) so I have no idea how much/what
is under there.
n 12" vapor-backed fiberglass batts for entire attic, and blown in under de
want to start over and do it right.
I'd start with what insulation is against the ceiling. It should have a va
barrier. For example, if it's fiberglass batts with the vapor barrier agai
the ceiling, then I would leave it there and put either unfaced fiberglass
batts going in the opposite direction, or blown in, on top.
Also, what's in the open areas that's close to ceiling, ie likely the origi
stuff, is likely what's under the covered up area. Depending on it's
thickness, it's probably not practical to do anything with the areas covere
with plywood. If there is already a reasonable amount, filling up most of
the joist space, there isn't going to
be room enough to do much additional good and it may not be worth worrying
There is roughly 2-4" of loose insulation beneath the existing down-faced batts. The vapor sides have been slashed for placement on top of existing insulation.
The issue of what - if anything - beneath the decking, remains.
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