stan gibson on sun 31 oct 10
Hey there potters...Building a big cross draft wood fire kiln=3D2C placed b=
ac=3D
k into a hill=3D2C the whole thing surrounded by a concrete retaining wall.=
.W=3D
ill be 4.5 inches hard brick backed by 4.5 inches soft brick with periodic =
=3D
header courses of hard brick extending to the outside wall... drain pipe a=
=3D
t the footing=3D2C back filled with rock...essentially a rectangular concre=
te=3D
box inside of which the kiln sits...Outside width of the kiln is 63 inches=
=3D
=3D2C inside measurement of the retaining wall is 65 inches=3D2C leaving a =
one =3D
inch gap between the kiln wall and the concrete each side...The question is=
=3D
: With what do I fill the one inch gaps??? Some kind of rigid insulating =
=3D
material like mineral wool??? An air space??? The concern is baking the co=
=3D
ncrete=3D2C but will also need some kind of structural reinforcement to kee=
p =3D
the outside wall from moving around...Whaddya think??? Thanks!
Stan Gibson
=3D
Paul Herman on mon 1 nov 10
Stan,
I would use my homemade insulating castable to fill the one inch gap.
You also could buy a bag or two of 2300 degree castable to do the job.
I think you need something that will set up hard, not a fiber or
mineral wool.
Good firings,
Paul Herman
Great Basin Pottery
Doyle, California US
www.greatbasinpottery.com/
On Oct 31, 2010, at 7:28 PM, stan gibson wrote:
> Hey there potters...Building a big cross draft wood fire kiln,
> placed back into a hill, the whole thing surrounded by a concrete
> retaining wall..Will be 4.5 inches hard brick backed by 4.5 inches
> soft brick with periodic header courses of hard brick extending to
> the outside wall... drain pipe at the footing, back filled with
> rock...essentially a rectangular concrete box inside of which the
> kiln sits...Outside width of the kiln is 63 inches, inside
> measurement of the retaining wall is 65 inches, leaving a one inch
> gap between the kiln wall and the concrete each side...The question
> is: With what do I fill the one inch gaps??? Some kind of rigid
> insulating material like mineral wool??? An air space??? The
> concern is baking the concrete, but will also need some kind of
> structural reinforcement to keep the outside wall from moving
> around...Whaddya think??? Thanks!
>
> Stan Gibson
douglas fur on wed 3 nov 10
Stan Gibson
* The concern is baking the concrete, but will also need some kind of
structural reinforcement to keep the outside wall from moving
around...Whaddya think??? Thanks!*
You need to nail down that detail of structural continuity between the kiln
and concrete. Concrete is nice in that there are alot of systems made to
cast anchors etc in place but that much concrete is a big heat sink and can
hold moisture which requires more energy to be driven off.
Concrete block set up with out mortar have a 71/2" repeat which comes out t=
o
three bricks at 21/2". stacked up dry concrete can be poured into the cell=
s
to tie the wall together. (These vertical columns of concrete can continue
as support for a roof...) This has less mass to be heated. A horizontal
header can be poured including anchors for angle iron at the level of the
arch spring to resist the thrust of the arch. with the open cells you
wouldn't need the one inch gap- you might consider some heavy weight
foil between kiln and blocks as a moisture barrier.
DRB
Seola Creek
Michael Mahan on thu 4 nov 10
In response to Stan Gibson's question about what to put between the outsi=
=3D
de
of his kiln and the concrete block retaining wall:
I recently built a Manabigama (wood kiln designed by John Theis and Bill =
=3D
Van
Guilder). They recommended placing several layers of heavy duty aluminum
foil between the concrete block and the firebrick which acts as a heat
reflector and vapor barrier.
gary navarre on fri 5 nov 10
Hey Crew,=3D0A=3D0A I don't understand why you need a concrete retaining wa=
ll i=3D
f you built into the hill unless your arch is not self supporting. If you h=
=3D
ave good drainage just back fill with the hill dirt and you are good to go.=
=3D
The 4.5" of hard brick with 4.5" IFB should be plenty of insulation althou=
=3D
gh I added a layer of 1" fiber blanket between the hard and soft brick on m=
=3D
y Hobagama. If you want to protect that from the weather cover with red bri=
=3D
ck or just even heavy plastic. An inch of fiber blanket between the bricks =
=3D
would take up the space. With that much insulation not much heat will get t=
=3D
o the out side.=3D0A=3D0A I always liked the romantic idea of building into=
a h=3D
ill and every time I started digging the chamber ended up on the flat fully=
=3D
exposed above ground. Among other things I've found this kiln to be a lot =
=3D
easier to work around, as cross drafts go.=3D0A=3D0A Hope you success and d=
on't=3D
let them fool ya eh.=3D0A=3D0AGary Navarre=3D0ANavarre Pottery=3D0ANavarre=
Enterpr=3D
ises=3D0ANorway, Michigan, USA=3D0Ahttp://www.youtube.com/GindaUP=3D0Ahttp:=
//publ=3D
ic.fotki.com/GindaUP/=3D0A=3D0A=3D0A--- On Sun, 10/31/10, stan gibson onpott=3D
ery@HOTMAIL.COM> wrote:=3D0A=3D0A> From: stan gibson .COM=3D
>=3D0A> Subject: [Clayart] Wood kiln question...=3D0A> To: Clayart@LSV.CERA=
MICS=3D
.ORG=3D0A> Date: Sunday, October 31, 2010, 9:28 PM=3D0A> Hey there potters.=
..Bu=3D
ilding a big=3D0A> cross draft wood fire kiln, placed back into a hill, the=
=3D
=3D0A> whole thing surrounded by a concrete retaining wall..Will be=3D0A> 4=
.5 i=3D
nches hard brick backed by 4.5 inches soft brick with=3D0A> periodic header=
c=3D
ourses of hard brick=3DA0 extending to the=3D0A> outside wall... drain pipe=
at =3D
the footing, back filled with=3D0A> rock...essentially a rectangular concre=
te=3D
box inside of=3D0A> which the kiln sits...Outside width of the kiln is 63=
=3D0A=3D
> inches, inside measurement of the retaining wall is 65=3D0A> inches, leav=
in=3D
g a one inch gap between the kiln wall and the=3D0A> concrete each side...T=
he=3D
question is:=3DA0 With what do I=3D0A> fill the one inch gaps???=3DA0 Some=
kind =3D
of rigid=3D0A> insulating material like mineral wool??? An air=3D0A> space?=
??=3D
=3DA0 The concern is baking the concrete, but will=3D0A> also need some kin=
d of=3D
structural reinforcement to keep the=3D0A> outside wall from moving around=
..=3D
.Whaddya think???=3DA0=3D0A> Thanks!=3D0A> =3D0A> Stan Gibson=3D0A> =3DA0 =
=3DA0 =3DA0 =3DA0 =3D
=3DA0 =3DA0 =3DA0 =3DA0=3D0A> =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3DA0 =3D=
A0=3D0A> =3DA0 =3DA0 =3DA0 =3DA0 =3DA0=3D
=3D0A=3D0A=3D0A
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