I have a wood framed detached garage that I would like to insulate. I only plan on heating it a few times a year when I have a project to do or something I have to fix in winter (I live in upstate NY) with a portable heater. The garage is wrapped on the outside with Tyvek over the plywood and covered with vinyl siding. I plan on using r13 fiberglass insulation on the sides and r19 in the ceiling.
Is there any reason why I should use kraft faced in this situation? It is more expensive and I have a vapor barrier already with the Tyvek right? I will be covering the inside with 5/8 drywall on both walls and ceiling.
Thanks.