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Re: GSBN:Borax fireproofing?
Hello Michel, and everyone else,
I would rather go on Evgen Shirokov position, that is, fireproofing with
liquid clay (also called "french dip" by Tom Rijven & his fans!).
Well, Borax is a good retardant (retards ignition superficially, on burnable
materials like straw, wood or paper), but...
But if there is an intense heat source, like a reall fire in the place, it
wont be long before fire spreads through, anyway. The huge advantage of clay
(beyond the fact it is healthy and unexpensive) is the physical barrier ,
stopping circulation of air within the fibers. No air, no fire.
This is obvious when we see the fire tests on a sb with clay on it: behing
the "earth shell" the fibers have slowly carbonized, but no flame, thus no
spreading, has occured.
And in most cases sb houses will get a plastering on, so if the first coat
is clay, borax salts turn to be unnecessary.
----- Original Message -----
From: "Bergeron" m.bergeron@...
To: "GSBN" GSBN@...
Sent: Wednesday, February 07, 2007 8:37 PM
Subject: GSBN:Borax fireproofing?
Hello Mark and, hopefully, all the other noble members of this list ! (I'm
not sure this reply will get to any of you because it's my first ever). If
it does, well I also want to say hello to those of you I met at the Ontario
I am co-author, with Paul Lazinski, of the book "Serious Straw Bale", in
case you happen to know the book. At page 206 of the book we describe the
recipe of the boron mix which was given to me by Paul Belanger of Living
Design Systems in Alberta, Canada. He has used that mix many times to
protect bare bale walls during construction against fire hazards. He has
used it particularly over flax straw which, as you may know, is highly
flammable due to its high linseed oil content.
The mixing is done this way: Two parts of borax are mixed dry with one part
of boric acid to near-boiling water, to the point of saturation-when the
powdered ingredients do not dilute anymore-and then sprayed, usually with a
pressurized garden sprayer. It doesn't take very long to spray an entire
structure this way, and it certainly makes everybody feel much safer until a
base coat of plaster is applied. A mix of 10 pounds of borax and 5 pound of
boric acid is normally sufficient to spray a house.
If you can't find the basic ingredients you could check with a cellulose
fiber manufacturer for they use the same material to coat the fiber mix we
use for insulation purposes.
6282, de Saint-Vallier
Le 07/02/07 13:54, Ç Mark Schueneman È markschu@... a ?crit :
COSBA has been asked to provided some 'fireproofed' bales for seating at a
childrens event here in Boulder. The city requires they be fireproofed.
will actually be spread out in a grassy lawn and present little fire
but the city is worried about some subversive type igniting them, I guess.
has several mentions of Boraxed bales but no mention of mix ratio or
penetration required. Any experience with this by anyone?
Colorado Straw Bale Association
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