Insulation and vapor barrier questions for a basement wine cellar
I am looking to convert an unused room in my basement into a passive wine cellar. I live in Zone 5 in BC, Canada. The 11′ x 8′ room has two exterior foundation walls (concrete), and two uninsulated interior walls finished with drywall. My house is well built by a reputable builder, and I assume the two exterior foundation walls are properly insulated (I have not removed the drywall to see). The floor is uninsulated concrete with vinyl plank. My plan is to simply insulate the two interior walls and ceiling (to R15 or higher) and leave the two exterior walls as is. I have investigated spray foam, but want to keep costs a little lower than the quotes I have received, so am thinking fibreglass batting. I have a couple questions:
1. Do I need vapor barrier on the outside of the interior walls — and if so can I wrap it around the studs on the inside of the room? That allows me to only tear out the drywall on the inside.
2. Is my plan to leave the exterior walls as is okay?
3. Should I just buck up for spray foam?
Thanks in advance for any advice!
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