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Posted by hallerb@aol.com on July 1, 2008, 8:23 am
wrote:
> hall...@aol.com wrote:
> > > I have rock wool insulation stapled to the rafters of my cape cod
> > > built in 1952. It's in pretty good shape but I'm not sure if it shoul=
d
> > > be replaced or augmented. My 2nd floor is always a degree or two
> > > colder than my 1st floor in the winter so I decided I'm in need of
> > > some insulation. I checked and noticed that where the dormers were
> > > added there is a lack of insulation.
>
> > appears rock wool and fiberglass are same per inch, around 3
>
> > closed cell foam is over r6 per inch.
>
> > i would pull up the rock wool and replace with closed cll foam
>
> Only if it's completely covered with plaster or drywall, right?
> Because foam burns like crazy and must never be left uncovered. =C2=A0I
> don't think any codes allow it to be left exposed. =C2=A0If covering the
> insulation isn't possible or practical, there's dense fiberglass, also
> rated about R-6 per inch, that's safe to leave uncovered.
Spray in place closed cell foam is superior because it expands and
seals all the tiny gaps, holes around electric outlets etc.
Rooms will be noticeably quieter and more comfy.
if your going to all the work to replace the insulation you might as
well go with the best!
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