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How to frame this wall

1125 Views 9 Replies 5 Participants Last post by  Snboard976

I am going to be finishing the basement with 3 inches of closed cell spray foam, tile floor and mold resistant drywall. I would like to use metal studs because I am concerned about humidity/moisture.

My question is how to frame the wall under the duct in the picture. I have a field stone foundation covered with a skim coat and painted with some type of water proof paint. It is not level. There is only a quater inch between the duct and the foundation. I don't want to frame inside of the duct because I would lose so many square feet.

How would you frame the wall? Can it be done with metal studs?
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Best to remove the duct and SPF or foamboard the rim areas. Right now, the heating system is drying the rim area- through the air permeable fiberglass insulation, that will change dramatically after 3" SPF in front of it. If the steel studs are in front of the SPF, no worries; Insulation Building Science Bulletin.pdf

IMO, tie to to the concrete wall with a vapor barrier against the concrete at contact point. OR, run a wood 2x2 against the concrete (w. V.B.), just below the duct work, add a 2x2 frame (ladder) extending away from the concrete, past the duct enough to nail a a few vertical 2x2 to fasten all to floor joists above. Get creative...

PS use foil faced (or a vapor barrier plastic) foamboard under the sill plate/track of the new wall to stop moisture through the slab. Where is the house? What on the concrete walls?
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