I am to the point of considering how to insulate my new shop. It is a 1.5 story structure and I am considering extending the insulated area to the upstairs storage space in order to mediate temps up there. I had a spray foam guy out today to give an estimate. When we discussed the roof insulation he said there was no need to put baffles for venting. I have always been told to vent insulated roofs to protect the shingles. His comment was that without baffles the shingle life may be reduced by 2-3 years but shingles usually don't last as long as claimed. My shingles are 30 yr Owens-Corning and they say to put the baffles.
Suggestions appreciated.
Suggestions appreciated.