Monday, August 13, 2007

Re: [papercreters] Insulation Value -was- Re: boric acid one more thing

Good thinking- I like the thought process. If your form has a trough on top
with a water repellent barrier- then you could use water to compress the
slurry-more water more compression. What is water about 8 pounds to the
gallon? Bob C

> It's time to talk about papercrete's counter-intuitiveness again.
> My results indicated that compressing the slurry into the form
> INCREASED the insulating properties. The more a sample was
> compressed, the higher the R-Value. > decreasing insulation properties.
>
>>
> My theory to explain this phenomenon is that the best insulation is
> achieved by trapping air INSIDE the paper fibers. Loosly hindering
> air flow BETWEEN fibers is only moderately effective. I think
> compressing the slurry tends to push the fibers closer together which
> significantly reduces the permeability of the final product to air
> infiltration. I also theorize that micro convection currents are
> greatly diminished by the denser fibers.
>> The idea that compressing insulation hinders performance applies
> primarily to fiberglass batts. Fiberglass fibers are solid glass
> rods. Compressing the batts pushes out all the air. Compressing
> cellulose only pushes out the loose air. The trapped air inside the
> paper fibers remains.
>



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