First, not sure what you mean by vaulted. If you have scissor trusses, which have a pitched ceiling rafter at a different elevation the roof rafter with a space in between, then you can insulate to that and the air space will be above. If the roof line rafters are the same that you are putting ceiling against then you should at least put some Styrofoam baffles in to let air flow from the bottom to the top at the ridge, then insulate. R19 is ok for walls but in Conn I would spend a couple more dollars and put in at least R30 in the ceiling. Code calls for much higher Im sure (in MD we now need R40 min) but we used R30 for years, and it will be fine for a garage. Also, have you purchased the heater yet?, There may be a better option for that as well.
|