What is a good, vsquot;recommendedquot;, thickness of a dense/closed cell spray foam insulation for heating/cooling air supply ducts running above the unheated garage to a room above itFrom what I can see, the builder did about 2-3 inches, and the air going thru that stretch is being cooled off big timeI know for a fact there's a great temperature loss in there during cold winter months.Would there be a benefit to spray a couple of more inches? I have 8quot; joists and 5quot; duct work, that leaves about 3quot; left for foam, I figuredIn the area where the ducts runs underneath and across the joists, the thickness measured was about 2quot;
more better as would be rolls of insulation or blown insulationI would do bothFill in the gap and cover over with 1 foot of insulationHeat rises.
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