Originally Posted by Bassike
I live in montreal canada so it gets pretty cold.
Also would it be ok to put the insulation directly on the concrete and put the vapor barrier after or should I put plastic against the concrete then the insulation and plastic again?
Only if the insulation is a rigid foam.
If so, depending on type and thickness, you do not need the poly vapor barrier.
Sound is usually more impacted by the interruption of vibrations through the framing as compared to the insulation schedule.