Re: [papercreters] Re: Fireproof ratio question for papercrete

It would be good to have a source for these numbers.   I believe Judith is using less cement than that in her latest fire test.

 

I have been looking at Perlite instead/in addition to paper.   If fire prevention is your concern, perlite is the answer.   You can use 6 to 8 cubic feet of perlite per 1 sack of cement, which is not only easy on your pocketbook but kind to the environment.   Also, the less cement you use the greater insulation value you get.

 

Neal

 

-------------- Original message --------------
From: "clydetcurry" <clyde@evesgarden.org>

as a dry weight ratio a yard of finished papercrete requires at least 85 lbs.of paper -fire resistance requires at least 3 1/2 sacks of cement@ 94 lbs each or 330 lbs - so that is like 4 lbs sof cement per 1 lb. of paper- not the other way around - folks are way to cheap with the portland- carefull -Clyde---

In papercreters@yahoogroups.com,
"Ernie Phelps" <eepjr24@...> wrote:
>
> --- In papercreters@yahoogroups.com, "gmkdart" <gkrautha@> wrote:
> >
> > However, I am concerned about flammability-- it seems the general rule is a 4:1 mix of portland cement to paper. My question is, are these dry weights?
>
> I would look at your source for the 4:1 ratio to answer that question.  Everyone on the list has slightly different mixes they use in different situations. I don't need mine to be fireproof at the moment, but I need it to stand up to weather. So I use about 3:1 wet pulp to  dry portland by volume. For fireproofing, I would probably be inclined to up the inerts by adding lime, portland or sand.
>
> - Ernie
>

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