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 (2×6 framing with vapour barrier, fiberglass batts and drywall). The remaining exterior wall is 2×4 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?
Best Answer
I would not waste the insulation on an outside wall unless your garage door was getting insulation. Drywalling has benefits though... First you need to use fire resistant (5/8) in most places in the US for garages, a fully drywalled and painted garage will be deemed nicer by those wanting to give you money for your house, white flat walls reflect light the best, noise reduction... all I could think of.
Small tip if you do this... Run some crosses at like 5 and 7 feet along the wall. That way you have places to nail things without measuring for a stud.