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cobblestones as thermal mass

 
Posts: 33
Location: South coast MA, Zone 6b
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If I wanted to add thermal mass to surround a wood stove, would cobblestones and field stone [large rocks from the ground] do the job? I assume that cobblestones or larger granite stones would take longer to gain heat, but they would hold the heat over a longer time than brick or cob surrounds.

Is there a table, site, that could help determine the heat storing potential in granite?
 
If we don't do the shopping, we won't have anything for dinner. And I've invited this tiny ad:
Heat your home with the twigs that naturally fall of the trees in your yard
http://woodheat.net
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