I'll echo the cellulose observations. I've had it in an enclosed roof space
and also as batts semi-exposed above a suspended ceiling. It's fine for a
number of years, but as time goes on it breaks down. Pull the batt down and
there's just powder.
In the enclosed roof space (sheeting and shingles on rafters, and
tongue-and-groove redwood on the underside ot the rafters), we developed an
unseen leak. We couldn't figure out where carpenter ants were living, till
I finally pulled off the entire roof, deck and all. The ants were living in
the cellulose insulation, and where they were, much of it was just gone.
Interesting side note. Unlike termites, carpenter ants don't eat wood, they
just hollow it out and live in it. Did they hollow out the Douglas fir
rafters or the fir plywood sheeting? Nope - they made channels in the 3/4"
tongue and groove redwood paneling and lived there. I thought redwood was
insect-proof....
I removed the cellulose insulation, vacuumed the area thoroughly, put in
fiberglass batts, re-decked and re-roofed, and we haven't; seen an ant in 12
years or so.
Karl
>> Did you do the blown cellulose yourself? How did it go? I am
>> thinking of insulating my garage attic space with that stuff,
>
> Is there any good reason to believe it's better than what they had 40
> years
> ago ? My attic has some 40 year old cellulose, and it's pretty nasty.
> Doubt it's doing anything for insulation either, since it appears to be
> less
> than 1/4 it's original volume.
>
> Randall
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