I am wanting to finish a basement bathroom and am getting conflicting information on how to create a proper insulation and vapor barrier against a concrete wall and how to run the water lines safely as this is an exterior wall. Currently there is the concrete wall, a 2 inch space, then a 2 x 4 wall filled with insulation, the vapor barrier, and then drywall. Do I need to build a second wall for the plumbing? And if so, do I remove the drywall before framing the second wall?
No you dont need to run a second wall. You can run plumbing in the same wall as long as they are running closer to inside not outside and protected by insulation from the concrete wall. Your vapour barrier must be on the warm side of the insulation. If you want to run the second wall since you dont want to damage the existing wall you need to remove the vapour barrier in order to avoide double vapour barrier problems.
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