Hello,

We have been using 1” perlite as
insulation beneath a clay combustion chamber with very good results. Before
using the perlite we had tried ash with good results also.   We decided to try 
the insulation
to prevent heat loss a few years ago when designing the prototype of a Rocket
stove (the Isleña stove).  The perlite is
enclosed inside the stove body, around and below the combustion chamber.  A 
removable metal grate for air flow under
the fire is placed inside the clay combustion chamber. 

Best regards,

D. Mena
From: [email protected]
To: [email protected]
Date: Wed, 22 Jan 2014 10:36:01 +0000
Subject: [Stoves] ash layer beneath fire









Hi.
 
Could anyone help me out with this - would an ash layer beneath a fire in an 
improved cookstove (as in the sketch attached) help insulate the fire and 
prevent heat loss into the body of the stove? The layer would be about an inch 
thick
 after compression, and is about half an inch below the base of the stove.
 
Thanks,
 
Vincent Okello










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