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Not able to get full fire brick  RSS feed

 
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I am attempting my first mass heater.  It will be on a wood floor in my home.  I see the common plan is fir two layers of full fire brick under the fire box.  I have half brick fire brick, a couple sheets of cement board, and a bunch of 2" thick pavers.  Would that work for under the half bricks to insulate the floor under the fire box?
Would get more fire brick, but $ is now a major issue and really need to get this done so we can shut off the electric heaters.
Thank you for any advice.
 
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Posts: 1821
Location: latitude 47 N.W. montana zone 6A
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Hi Thomas ;  Welcome to Permies.
Lets start with your floor.  Is it strong enough to support a rmh? We will assume that it is, or will be.
Next we need to protect the wood floor. Normal procedure is to use plain clay brick, laid flat with spacing for airflow in between. Your 2" thick pavers could work but the larger surface area would transfer more heat down into your wood. I recommend using the clay brick (home depot) and not using your pavers until the top of your mass, where they will work much better
Your concrete board goes on top of this. I recommend a double layer of 1/2" hardy board.
With only split firebrick to work with. I recommend 4" of insulated (straw) cob under the firebrick core. Hold that cob in place with a run of bricks glued (construction adhesive) around the perimeter of your cement board. If your mass is going up to a wall it should have an air gap to keep your heat indoors , not outdoors.
 
Thomas Schuessler
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As to floor strength...I will be adding 4x4 posts on footing blocks under the floor joists where the stove is to be built. (Thank you for your concern)
Will I be needing that air gap under the heated mass bench as well as the fire box? Or is the temperature enough lower there to do without? Also the back of the mass bench is against an outside wall.  I will try to get a pic of the area, and a layout drawing together asap so that my questions and answers are as clear as possible.
 
thomas rubino
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Better to have it all suspended. That way your gaining another warm air surface, and your floor is safe for sure.
Any outside wall should have air space or extra insulation.
 
thomas rubino
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Hey Thomas;   Any sawmills in your area ?  Most have a dry kiln for their lumber.  Full thickness firebricks will be in use if they do.    Simply asking (the right person) for surplus used  or new bricks might get you some bricks.  I did that and after talking to the owner about RMH's , looking at them on line...   He gave me several hundred FREE used bricks under the agreement he could come see my rmh in action!
What a deal!  There could be a similar deal waiting for you to go find... food for thought...
 
So I left, I came home, and I ate some pie. And then I read this tiny ad:
Food Forest Card Game - Game Forum
https://permies.com/t/61704/Food-Forest-Card-Game-Game
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