Papercreters: [papercreters] Re: Closed cell spray foam

Saturday, February 28, 2009

[papercreters] Re: Closed cell spray foam

Closed cell foam is very expensive. That's why I would fit together
pieces of junk styrofoam to make up the vast majority of the shell,
filling in the gaps with closed cell foam (spray or from cans). If
you're relatively patient you could make a very thick, very high "R
value" insulation layer, using only a small amount of purchased
material. I have been doing some experiments with this method and will
post the results soon.

Dave

--- In papercreters@yahoogroups.com, "Janoahsh" <janoahsh@...> wrote:
>
> Hi Dave, I have heard of closed cell urethanes, but at roughly 4
times the
> density of open cell urethanes it becomes cost prohibitive for a tight
> budget. As it is, open cell urethane foam is about the most
expensive foam
> available. It is certainly useful for compound shapes, and about the
> highest insulation value. The draw backs are toxicity and cost.
Open cell
> will absorb moisture and become nearly useless as demonstrated in colder
> climates like Fairbanks. This might be a good solution on the
outside of a
> concrete buried dome if one can afford it, but I wouldn't use it
anyplace
> there was a possibility of fire or breathable out gassing.
>
> Janosh