Well, Bruce has quoted the U values upthread, showing that the heat
doesn't just keep going, it has trouble getting through. Less trouble
with stone than brick, but still some. A foot thick stone wall seems
about the same as a single skin brick wall.
The Domestic Heating Design Guide lists the following U values for use
in heat loss calculations:
Solid stone wall, unplastered
305 mm U = 2.78
457 mm U = 2.23
610 mm U = 1.68
Solid brick wall, dense plaster
102 mm U = 2.97
228 mm U = 2.23
343 mm U = 1.64
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