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Insulation and/or vapor barrier on shared poured wall?

Insulation and/or vapor barrier on shared poured wall?

Old 01-07-11, 09:17 PM
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Insulation and/or vapor barrier on shared poured wall?

I'm starting to finish my basement which is in a townhouse and has poured basement walls built in 2003. The wall I share with a neighbor has been framed/insulated about 5' in from the outside wall by the builder, plastic sheating was used between the concrete and framed/insulated wall. As I frame the rest of the wall do I need to add plastic sheating and or insulate it? The wall seperates my neighbors basement and mine which is heated, and has never had signs of moisture. Would I be doing extra work and cost that would really not be needed?

Old 01-08-11, 08:57 AM
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I would not. Mainly because you want the moisture not to be trapped, but to dissipate in the space. Your wall should be spaced about an inch from the wall so as to create an area behind the wall for air to circulate. If it is below grade, it is already insulated by the earth (geothermally correct).

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