Re: Attached Garage Insulation Project
I think I can understand the two opinions received by the different inspectors.
Since you will be introducing heat into this space this now becomes conditioned space.
With that because you will be heating this space and installing insulation you will be required to add a vapour barrier ( on the warm side of the insulation ) to all exterior wall and ceiling surfaces.
As for the ceiling --- the vapour barrier should only be on the portion that is directly adjoining the cold zone under the roof.
You don't want vapour barrier under the portion of the living room floor above.
This is what I suspect is the concern by one inspector for trapping moisture.
In that area you could install house wrap material instead which would breath and not allow moisture to be trapped as a result of any vapour issues.
Another reason for the house wrap is it becomes an air barrier to better assist with keeping the floor above being exposed to cold air from the opening of the garage doors.
Combined with the house wrap and the heating will provide enough temperature to maintain the moisture to be in it's gaseous state -- vapour --- and allow it to breath out.
Hopefully this makes sense and helps.
"" an ounce of perception -- a pound of obscure "