While remodeling I had open cell sprayed into my vaulted ceiling. Company convinced me to use open over closed cell. I cant stop thinking about my roof rotting away. I am in climate 4 close to climate 5. The installer told me not to put plastic on the bottom of the rafter. I am from climate 6 where we always use a vapor barrier under drywall. My vaulted ceiling used to be vented. Shouldn't I at the very least remove the ridge cap and close the 1" gap with tar paper and shingles? Do I need to close the air gaps in the soffit? In zone 4, he said the vapor barrier needs to be on the roof side not the house side. Thanks, Confused in MO