craig clark on thu 31 may 01
Molly, if you are able, make your rafters and the kiln shed roof out of
steel! If you can't remember that wood combusts at about 454 F under normal
conditions though it can combust at a much lower temperature if conditions
are right and porosity sets in (this phenominon caused the Enginneering II
building of a University that I attended to burn to the ground.)
Before building the shed roof fire the kiln and gradually move away from the
chimney and kiln until you can't feel much of the radiant heat. Hang a piece
of old dry wood at this point and see what happens. Place a thermoneter it
and see what the temperature is.
It's probably not a good idea to use wood for a kiln shed roof one way or
the other!
Craig Dunn Clark
619 East 11 1/2 st
Houston, Texas 77008
mudman@hal-pc.org
-----Original Message-----
From: Evan DuVerlie and/or Molly Cantor
To: CLAYART@LSV.CERAMICS.ORG
Date: Thursday, May 31, 2001 5:32 PM
Subject: rafter spacing on shed for wood kiln-HELP!
>Hi, I'm Molly Cantor, a potter in Western MA. I'm almost finished
>building a wood fired kiln which will be fired up to about cone 10. It
>has an unlined (obviously)brick chimney, 18 feet tall.
>What i'm having trouble with, is getting any kind of definative answer
>on how far the RAFTERS of the SHED over the kiln have to be from the
>chimney so they don't burst into flame.
>Any sage answers out there?
>Thanks, Molly
>
>___________________________________________________________________________
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>Send postings to clayart@lsv.ceramics.org
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melpots@pclink.com.
>
Evan DuVerlie and/or Molly Cantor on thu 31 may 01
Hi, I'm Molly Cantor, a potter in Western MA. I'm almost finished
building a wood fired kiln which will be fired up to about cone 10. It
has an unlined (obviously)brick chimney, 18 feet tall.
What i'm having trouble with, is getting any kind of definative answer
on how far the RAFTERS of the SHED over the kiln have to be from the
chimney so they don't burst into flame.
Any sage answers out there?
Thanks, Molly
Robert and Mary Ann Sparacin on thu 31 may 01
If I was building a shed for a kiln, I would build it out of metal and or
concrete/brick, with galvanized steel 2x6's built up as trusses and a corrugated
steel roof...self tapping hex head screws with a screw gun work just fine. I would
space the trusses a foot from the brick and have them well insulated, with at least
a six inch air space, and cover the gap with corrugated steel. I would also install
the nearby trusses so they could be moved if temperature conditions warranted it.
Perhaps a little overkill (pun intended), but it would be a flexible design and
safe... why build a shed out of a flammable material????
RJS
Evan DuVerlie and/or Molly Cantor wrote:
> Hi, I'm Molly Cantor, a potter in Western MA. I'm almost finished
> building a wood fired kiln which will be fired up to about cone 10. It
> has an unlined (obviously)brick chimney, 18 feet tall.
> What i'm having trouble with, is getting any kind of definative answer
> on how far the RAFTERS of the SHED over the kiln have to be from the
> chimney so they don't burst into flame.
> Any sage answers out there?
> Thanks, Molly
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
Merrie Boerner on thu 31 may 01
HA !
Hi Molly,
My shed's wooden rafters were supposedly 18" from the chimney........I
say "supposedly" because they burned and I can no longer measure where they
were. I'd say, count on reaching cone 13. Count on anything flammable near
by to burn. Count on making repairs. Count on tons of excitement. If you
could make the rafters out of metal, do so !
Merrie
Dave Finkelnburg on thu 31 may 01
Molly,
The best answer to your question is to consult your local building code
and do as well as or better than that.
In my case, I headed off the rafters around the chimney (9"x9" inside,
hard brick, unlined, no mortar) on my gas kiln with angle iron which I
fastened to the wood rafters. If I had it all to do again, I'd frame the
whole roof in steel, as David Hendley suggested to me. Just one of the
many good ideas I have gotten from ClayArt.
I hope your kiln shed project goes well!
Dave Finkelnburg in southern Idaho
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