I'm in the process of a few projects in the garage, including raising the ceiling and insulating with spray foam. This has left me with a fair amount of leftover fiberglass batts.
There is a room above 70% of the garage (minus the front), and 2 walls are attached to the house (2x6 framing with vapour barrier, fiberglass batts and drywall). The remaining exterior wall is 2x4 framing with vinyl siding. The garage door is also insulated.
I am considering drywalling this wall since I like the look and I'm already re-drywalling the entire ceiling anyway. I'm located in southeastern Ontario, temperature typically anywhere from -30C to +30C (-22 to 86F). The garage is not a conditioned space.
Is there any downside to putting in insulation and drywall? Anything wrong with just drywall?
Has anyone that's done this actually seen a benefit (eg more stable temperature)? Keep in mind there's zero material cost here, so even a marginal benefit is ok (if anything this saves me time having to take it somewhere or throw it out).
I've read I should not use vapour barrier since it would prohibit drying and actually likely cause moisture/mold problems -- anyone disagree?