Thermal retention rate of cob vs thickness of cob

OK so I read where cob can stay warm for up to 30 hours blah blah blah,,, what I need to know is how much cob do I need to keep my greenhouse warm over night.

As soon as the sun is up, the GH warms up. I would hate to heat the greenhouse for the night, then have to open the door because it's too hot after the sun comes up.

So, what's the formula

1 ton of cob loses x% Heat per hours
or x inches thick = x hours

How much cob do people use? the more the better?

I currently have approx 300 lbs around the rocket stove, but in the process of adding more, I suppose I could add in stages as the wet mud should bond to the dry mud.

Marty Spehar : Again this month we are asking people to identify their general location to help us better help them. Look at your name and then mine ! If you goto the Permies
toolbox above, and between the Permies ad banner and the Permies Video clip of the day you will see the my profile button, location and growing season zone it you know it !

Your question should be about how fast heat travels through the Cob,(or brick or heavy dense stone) not how much heat it will retain, which is dependent on how your RMH was
made and with what materials. This will help in planning when to start your fire to give you best heat after midnight lasting till morning, experience will teach you the rest !

You can use the search key to do a 'heat flows through- - ' google search within our own Permies clould by first selecting Permies and hitting Google Search. Good Hunting !
For the good of the craft ! Big AL !

Hi Marty,

In general I've heard that heat moves through cob
at about an inch per hour.

...If that helps you.


Good "green housing".