Some (more) insulation questions
From a functional standpoint, what is the difference between open cell and closed cell foam insulation, and would either be better for insulating roof decks?
Currently, my attics have full soffit vents (which are open) as well as ridge vents. I have NEVER verified any positive ventilation. If the attic air is hotter than OD air, shouldn't that create a chimney effect?
Is it imperative that the soffits and ridges be closed if foaming the deck?