Question for all you more experienced homeowners: Do I need to vent every rafter bay in the attic? My house has a ridge vent and soffit vents. I peeked into the attic, and noted that about 10 of the rafter bays did not have any sort of ventilation. The insulation was in direct contact with the roof decking. The others have cardboard rafter vents. I'm thinking that those bays without rafter vents need to be vented, but just wanted more opinions before wrapping myself in Tyvek to play in the insulation.