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What exactly is the "R value" on rock anyways??
Quote from: Trevor P on February 21, 2009, 09:12:58 AMWhat exactly is the "R value" on rock anyways?? Don't know the R value but once it gets to the temp of your house, it will hold it for a very long time. Cave homes are one of the most efficient methods of home construction. Your entire house is a geothermal mass. Very easy to maintain a constant temp year-round. The big drawback is there is only one source of natural light and one way out in the event of a fire.