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How much insulation is needed around a Walker-style ceramic fiberboard firebox?

 
Matthew Wagner
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We are still working on our RMH build.  We were thinking a pebble-style would be the way to go but changed our mind and are going with cob.  We are working off of Erica & Ernie’s “Bonny Convection Bench” 8” plans.  

This plan is good for a suspended floor and has the convection aspect which will help heat more of our home.

The original plans use a firebrick firebox with 2” of perlite & fireclay beneath and around the sides of the firebox.  We are using the Walker SuperHot J Eight Inch ceramic fiberboard firebox.

My question is:  How much perlite/fireclay is needed beneath and on the sides of a ceramic fiberboard firebox, if any?
IMG_1782.jpeg
Barrel ona rocket mass heater getting up to temp
Filename: IMG_1790.mov
File size: 3 megabytes
IMG_1804.jpeg
a rocket heater assembled outdoors

Matthew J. Wagner
Saegertown, PA, USA

https://www.matthewjwagner.com

“They will build houses and live in them, And they will plant vineyards and eat their fruitage. They will not build for someone else to inhabit, Nor will they plant for others to eat. For the days of my people will be like the days of a tree, And the work of their hands my chosen ones will enjoy to the full.” - Isaiah 65:21, 22

 
thomas rubino
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Hi Matthew;
A cfb core would not require extra insulation on the sides but on the bottom, I would bed it on 2" of insulated cob just to be safe.
The sides of your core should have a "support" backer such as clay bricks.

For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com

 
Matthew Wagner
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thomas rubino wrote:Hi Matthew;
A cfb core would not require extra insulation on the sides but on the bottom, I would bed it on 2" of insulated cob just to be safe.
The sides of your core should have a "support" backer such as clay bricks.



Thanks, Thomas, for your answer.  I have a few more questions (and some progress images):

By “backer”, do you mean multiple courses of clay bricks up to the top of the CFB firebox?

If so, would clay slip be sufficient between these clay bricks, or would I need mortar?

Thanks for your (or anyone else’s) help on this.

IMG_2251.jpeg
Laying rocket mass heater foundation bricks for heating channels on a suspended floor.
Laying rocket mass heater foundation bricks for heating channels on a suspended floor.
IMG_2253.jpeg
Laying rocket mass heater foundation bricks for heating channels on a suspended floor.
Laying rocket mass heater foundation bricks for heating channels on a suspended floor.
IMG_2255.jpeg
Laying rocket mass heater foundation pavers for heating channels on a suspended floor.
Laying rocket mass heater foundation pavers for heating channels on a suspended floor.
IMG_2294.jpeg
Laying rocket mass heater foundation pavers for heating channels on a suspended floor.
Laying rocket mass heater foundation pavers for heating channels on a suspended floor.
IMG_2297.jpeg
Laying rocket mass heater foundation pavers for heating channels on a suspended floor.
Laying rocket mass heater foundation pavers for heating channels on a suspended floor.

Matthew J. Wagner
Saegertown, PA, USA

https://www.matthewjwagner.com

“They will build houses and live in them, And they will plant vineyards and eat their fruitage. They will not build for someone else to inhabit, Nor will they plant for others to eat. For the days of my people will be like the days of a tree, And the work of their hands my chosen ones will enjoy to the full.” - Isaiah 65:21, 22

 
Matthew Wagner
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Well, I guess this post needs many updates…

Here is a photo timeline of progress on our project:

I needed to take some measurements of our mocked up system outside for the foundation layout.



IMG_1969.jpeg
Spacing at the U-turn
Spacing at the U-turn
IMG_1964.jpeg
Firebox sizing before outer brick lining
Firebox sizing before outer brick lining
IMG_1965.jpeg
Firebox outside dimensions for making my paper layout template.
Firebox outside dimensions for making my paper layout template.
IMG_1968.jpeg
Manifold to firebox spacing
Manifold to firebox spacing
IMG_1963.jpeg
Firebox spacing dimensions
Firebox spacing dimensions

Matthew J. Wagner
Saegertown, PA, USA

https://www.matthewjwagner.com

“They will build houses and live in them, And they will plant vineyards and eat their fruitage. They will not build for someone else to inhabit, Nor will they plant for others to eat. For the days of my people will be like the days of a tree, And the work of their hands my chosen ones will enjoy to the full.” - Isaiah 65:21, 22

 
Matthew Wagner
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December 25, 2023 - Foundation layout almost complete.  Ready for a chimney installation.  Waiting on our Amish installer.

download the video attachment for a video explanation I recorded.
IMG_2297.jpeg
Firebox template on raised floor foundation
Firebox template on raised floor foundation
IMG_2301.jpeg
Firebox template in place
Firebox template in place
IMG_2293.jpeg
almost ready for a chimney
almost ready for a chimney
Filename: foundationprepexplanation.mov
File size: 254 megabytes

Matthew J. Wagner
Saegertown, PA, USA

https://www.matthewjwagner.com

“They will build houses and live in them, And they will plant vineyards and eat their fruitage. They will not build for someone else to inhabit, Nor will they plant for others to eat. For the days of my people will be like the days of a tree, And the work of their hands my chosen ones will enjoy to the full.” - Isaiah 65:21, 22

 
It's never done THAT before. Explain it to me tiny ad:
Rocket Mass Heater Jamboree And Updates
https://permies.com/t/170234/Rocket-Mass-Heater-Jamboree-Updates
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