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Posted by zenboom on August 23, 2005, 5:06 pm
>
> > It seems to me that cellulose has two drawbacks- 1) It is flammable. 2)
> > It is biodegradable and can support the growth of some micro-organisms.
> > The manufacturer could add biocides to limit this second issue, but the
> > underlying problem remains.
> > Polyurethane foam OTOH is inert to most micro-organisms but is
> > flammable. Flame retardants can be added but if the surrounding wood
> > supports the flame, it will still burn but with a lot of toxic smoke.
> > Could I suggest a small layer of fiberglass insulation on the attic
> > floor? It is not as an efficient insulator as the others, but from your
> > description of the temperature extremes you don't need that much. By
> > the same token, it will not cause as much overheating of the wiring and
> > will not by itself burst into flame if that were to happen.
> > If access for laying an insulation matt is problematic, I believe
> > fiberglass can be blown in the form of "chops" much like cellulose
> > insulation. Perhaps another poster has details on this.-Jitney
>
> Cellulose is treated with flame retardant. That same flame retardant
(boric
> acid) is a fine insecticide.
> I would be much more concerned about toxic smoke from drapes, upholstery
and
> carpeting.
>
I have heard health warnings regarding loose glass fibre floating around, so
I'd avoid "chop"!
There may be roll-on matting of an alternative synthetic material available
to you, but that requires access. Look at foam in-roof, or under sheeting,
again.
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