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Any photos of cob RMH on wooden floors? Specifically ones raised for an air gap...

 
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Any photos out there of Cob RMH's on wooden floors?  The consensus seems to be that it's absolutely necessary to create and air gap under the RMH and bench by laying hardie board over bricks and building on that, but I haven't been able to find any photos of a finished cob RMH that does this.  I'm scratching my head over how to bring the cob mass to the floor in an aesthetically pleasing way, while still leaving an air gap.  I have a few ideas, but am wondering how others have tackled this one.  

Also, Ive been conferring with a masonry heater builder who regularly installs his heaters on wooden floors without an air gap.  He pours a 3" concrete pad and builds on that.  Sometimes he adds an insulation layer of perlite-cement or structural insulation board.  Anyone every tried this, or something similar?  Previous posted have put the fear of a charred wood floor in my heart, so I'm pretty damn sure I'm going with an air gap, but can't resist asking anyway...

Thanks!


 
gardener
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building solar woodworking rocket stoves wood heat greening the desert
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Hi Mark,  Still in the planning phases myself to install a batch box on a wooden floor. Here are some of my findings:

Cyclone RMH

RMH 9 Brick - from the DVD Rocket Mass Heaters with Ernie and Erica


RMH 17 Aluminum Foil - from the DVD Rocket Mass Heaters with Ernie and Erica
 
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Here are some photos from our RMH build on a wooden floor:
brick-and-concrete-foundation-complete.jpg
[Thumbnail for brick-and-concrete-foundation-complete.jpg]
brick-foundation-for-RMH.jpg
[Thumbnail for brick-foundation-for-RMH.jpg]
future-location-of-RMH.jpg
[Thumbnail for future-location-of-RMH.jpg]
J-tube.jpg
[Thumbnail for J-tube.jpg]
laying-out-bricks-under-RMH.jpg
[Thumbnail for laying-out-bricks-under-RMH.jpg]
perlite-clay-insulation.jpg
[Thumbnail for perlite-clay-insulation.jpg]
radiant-foil-on-subfloor.jpg
[Thumbnail for radiant-foil-on-subfloor.jpg]
riser-base-on-perlite-clay.jpg
[Thumbnail for riser-base-on-perlite-clay.jpg]
RMH-brick-foundation-covered-with-radiant-foil.jpg
[Thumbnail for RMH-brick-foundation-covered-with-radiant-foil.jpg]
 
Mark Bowers
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...and some more:
cobbing-over-brick-foundation.jpg
[Thumbnail for cobbing-over-brick-foundation.jpg]
manifold-in-place-pipe-being-laid-out.jpg
[Thumbnail for manifold-in-place-pipe-being-laid-out.jpg]
manifold-to-pipe-connection.jpg
[Thumbnail for manifold-to-pipe-connection.jpg]
RMH-has-a-lot-of-rocks.jpg
[Thumbnail for RMH-has-a-lot-of-rocks.jpg]
 
Mark Bowers
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More recent photos exist--I just need to find them. But I think these show pretty clearly what we did to keep the heat out of the wooden subfloor. Getting pictures from the understructure will not be easy this time of year...snow and all that.
 
Gerry Parent
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Great input Mark! Thanks for the photos.
How has your Dragon been working out for you?
 
Mark Bowers
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Our Dragon is a HUGE improvement over our itty-bitty wood stove that was last winter's heat source.

We still need to add about a yard's worth of material to complete--more cob at bench and around heat transfer pipes to capture more heat, and then some more cob and rocks along edges for better aesthetics. Unfortunately we won't be able to do any of that until spring or summer when the ground thaws. A lot of heat is getting pumped out of our chimney and we're using more wood than anticipated.

Once complete I believe our RMH will be great. Right now it's just good.
 
Mark Bowers
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Dragon in action.
IMG_1379.JPG
[Thumbnail for IMG_1379.JPG]
 
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