OK, gang...we've had about 10 experienced roofing contractors give us quotes for replacing our 22 year old roof. We feel we have a good handle on "shingle quality" and proper installation and the like, but these "experts" seem about evenly divided on whether our cathedral ceilings do or do not need a ridge vent. We have NO attic. We have a two story great room with cedar ceilings (cedar is what you see inside the house when you look up) and even the master bedroom and master bath upstairs have vaulted cedar ceilings with no attic above them...just cedar ceiling, wood beams, with insulation on top and shingles on top of the insulation. 1/2 are telling us the roof was constructed incorrectly and that even a ceiling with no attic needs a ridge vent, and the other half say that's crazy talk and that the small "register" type vents under the eaves is quite adequate and that the contractors telling us we need the ridge vent are just trying to rip us off. The ridge vent proponents say the other people don't know what they're talking about, and that that insulation section needs a ridge vent so that it doesn't trap moisture and cause mold issues and doesn't attract carpenter ants (which are a constant battle for us). A roof is a huge purchase and we have one shot at doing it right the first time...so do we need a ridge vent installed, or not? We do have a shower in the upstairs master bath and there is no "ceiling" above the shower stall...the steam just rises into the air and is hopefully sucked in by the vent fan in the wall above designed to pull the moist air outside. Help?