Do ceilings really sweat?
We have a 12×30 porch that we’re converting into a bedroom. Ideally, I’d like the ceiling to follow the roofline and be vaulted all the way to the peak.
However, the contractor says that isn’t possible. He says the ceiling needs to be dropped about 6 inches to create an air gap between the insulation and the drywall to prevent condensation (“sweating”).
Is this accurate? Is an air gap always required, or are there other ways to build a vaulted ceiling in this situation? I’d appreciate any insight from those with roofing or framing experience.
I've attached pictures of it for reference. Ideally we will be removing the existing ceiling boards that was used for the porch and the supporting boards will be moved back onto the house. I would just like for the ceiling to be all the way up.