If home insulation is so great (and no argument that it is), why is my attic 90% air above about a foot of insulation? Why isn’t the insulation 2 or 3 or even 8 feet deep? It works to keep heat out just as much as it keeps heat in, right?
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You can’t fill the entire attic with insulation because you need to have airflow. Without adequate airflow you get mold. You also need to have room to move around to deal with things like rodents or other infestations. In many places the furnace is in the attic, or the air handler for the AC/heat pump, as well as all the ducts for the HVAC system, and you need to have easy access to all of those.
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