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Insulation on top of wool insulation Eigenvector 07-27-2007
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Posted by Eigenvector on July 27, 2007, 12:01 am
My attic is insulated with wool. Not having any idea just how good that
performs I had a mind to augment it with the pink stuff. But I'm wondering
if I can just roll it on top of the wool, or should I remove the wool first.
If I do, removing it will be a job I'd just as soon not do - I'd rather pay
higher bills than do something like that. The other issue for me is that
they covered up all the wires with the wool, so I don't have a clue where
they are and that makes my job of re-wiring just a bit more difficult - as
normally I would just clip the old stuff and run the new Romex through the
hole left by the bad stuff as it dropped into the wall. But that adds a
different question - in the attic, is wiring exposed/insulation cut around
it like is done in a wall, or does the insulation cover it?



Posted by David Martel on July 27, 2007, 8:09 am
eigen,

I can't think of any reason not to just roll out the fiberglass over the
"wool". Try to get fiberglass without a vapor barrier since the wool should
be lying on a vapor barrier already.

Dave M.



Posted by Eigenvector on July 27, 2007, 7:48 pm

> eigen,
>
> I can't think of any reason not to just roll out the fiberglass over the
> "wool". Try to get fiberglass without a vapor barrier since the wool
> should be lying on a vapor barrier already.
>
> Dave M.

Well unfortunately there isn't a vapor barrier under the wool, just the
sheetrock.

Does wool even provide decent R values or what. I've heard rumors that it
works relatively well - we're talking 4 to 5 inches of the stuff in the
attic.



Posted by BobK207 on July 27, 2007, 8:47 pm
>
>
> > eigen,
>
> > I can't think of any reason not to just roll out the fiberglass over the
> > "wool". Try to get fiberglass without a vapor barrier since the wool
> > should be lying on a vapor barrier already.
>
> > Dave M.
>
> Well unfortunately there isn't a vapor barrier under the wool, just the
> sheetrock.
>
> Does wool even provide decent R values or what. I've heard rumors that it
> works relatively well - we're talking 4 to 5 inches of the stuff in the
> attic.

EV-

Your blow-in rock wool is about comparable to fiberglass roll (per
inch basis)

http://www.coloradoenergy.org/procorner/stuff/r-values.htm

you've got about R12 to R15

what is recommended for your area?

Even SoCal attics now get R30......Twenty five years ago I did R30 & I
thought it was overkill, now its city code.

JMHO blow-in is easy & cheap compared to fiberglass batts or rolls
BUT if you ever have to work in the atttic.......blow-in sucks

Blow-in cellulose is comparable to blown rock wool & fiber glass
batts; fiberglass blown is lower

cheers
Bob


Posted by Eigenvector on July 27, 2007, 9:13 pm

>>
>>
>> > eigen,
>>
>> > I can't think of any reason not to just roll out the fiberglass over
>> > the
>> > "wool". Try to get fiberglass without a vapor barrier since the wool
>> > should be lying on a vapor barrier already.
>>
>> > Dave M.
>>
>> Well unfortunately there isn't a vapor barrier under the wool, just the
>> sheetrock.
>>
>> Does wool even provide decent R values or what. I've heard rumors that
>> it
>> works relatively well - we're talking 4 to 5 inches of the stuff in the
>> attic.
>
> EV-
>
> Your blow-in rock wool is about comparable to fiberglass roll (per
> inch basis)
>
> http://www.coloradoenergy.org/procorner/stuff/r-values.htm
>
> you've got about R12 to R15
>
> what is recommended for your area?
>
> Even SoCal attics now get R30......Twenty five years ago I did R30 & I
> thought it was overkill, now its city code.
>
> JMHO blow-in is easy & cheap compared to fiberglass batts or rolls
> BUT if you ever have to work in the atttic.......blow-in sucks
>
> Blow-in cellulose is comparable to blown rock wool & fiber glass
> batts; fiberglass blown is lower
>
> cheers
> Bob
>

Well I hadn't even considered what my area wants for an R value - in Seattle
is a little under R-40, probably overkill given the mild winters, but that's
what it said.



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