Quote:
Originally Posted by trikkonceptz
there has been no change in my attic temperature.
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As long as I had a radiant barrier on the floor of the attic I wouldn't concern myself much with temperature and, as far as ventilation, would just make sure that I have
enough bottom vents (soffits/eves)
and top vent(s) (Wind turbine Roof Fan) for proper airflow. And I mean
TOP vent(s) for proper airflow, not middle.
The attic temp would actually be higher because the
radiant barrier would block so much heat back into the attic, but below the barrier and
the inside would BE and, more importantly, FEEL much cooler because 5% of
HEAT is transferred through conduction, 20% through convection, but
75% through RADIATION
Unlike radiant barrier regular insulation does not block heat. The R value of regular insulation rates resistance to CONDUCTIVE heat transfer and is not applicable to a radiant barrier.
Without a radiant barrier, by the time You are back from work, a lot of
is absorbed and STORED in Your insulation and is ready
for You to FEEL it's RADIANT glow even though Your thermostat is trying to convince You that the
AIR TEMPERATURE is "comfortable". (Unless You have a thermostat that measures "mean radiant temperature" or a "globe thermometer")
BTW, apparently It is OK to put a radiant barrier on top of existing insulation AS LONG AS IT IS NOT A VAPOR BARRIER. (So perforated or chips would do.)