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Building directions for portable rocket mass heater, with river rock

 
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Hi, I want to build this in my greenhouse, and I wont be moving it, but I have a lot of river rock, so this seems a good way to me. Where do i get the directions..newbie.. thanks, lynda I am also at aquaponics in NC on facebook. I am trying to learn a lot.. thanks,
 
steward
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Location: Currently in Lake Stevens, WA. Home in Spokane
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River rocks can be dangerous around fire/high heat.

Through the eons, they do absorb water (mostly through fissures). If that water is heated rapidly to high temps, the rock can explode. I would suggest 'drying' them slowly in an outdoors fire pit before trying to use them in a stove or fireplace.

 
lynda waller
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alright... nice to know.. I am very green and need lots tlc.. but I will learn... cob , not being my best ability, and I am looking at the one made of the bricks at home depot or .. mastering the one made out of a water heater... just because i got river rock, dont mean i have to use them.. there is so much information,and not being a pro, it is hard to decide. I might be alone with a 12 yr old making this, so I need something easy. Is there a RMH for dummies.. city girl learning the hard way.. thank you so much, all advice needed.. my green house is 100x20 and I am in NC, so got to work it out. heat is important.. I know you guys have been at this forever, but it means a lot when you take time with the newbies.. I am training the next generation, so keep the hope flowing guys..
 
gardener
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Location: Southern alps, on the French side of the french /italian border 5000ft elevation
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Well Linda.

River rocks can be used in the mass. If they crack, they won't go far being surounded by cob or mud or whatever is you infill/binder. Just make sure they're not too close to the surface of the bench. May be 4 inch or more.
 
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