While we originally planned for insulation batting and air channels from eaves to a ridge vent, we decided to use spray foam insulation for the ceilings and gable walls. Three Rivers Urethane provided insulation services.
The fireplace framing and hearth stone platforms are built. Our fireplace installer suggested that a 2×4 be placed on the platform so that the firebox can sit raised. The stud at the top of the firebox opening will also need to be raised.