I'd like to frame a wall around a 3 inch PVC pipe in my basement and would like to lose as little interior space as possible. The picture shows what I'd like the framing to look like and the dimensions. It's not load bearing, it will just have drywall on it. The top section "A" is build with 2x4s sideways, sort of like a soffit/bulkhead ladder that's why the thickness is shown as 1 1/2".
Is there a way to make this rigid/stable without tying section "C" into concrete with tapcons through the insulation? Flat corner braces between A&B and B&C? Screws instead of nails? In g
Thanks in advance for any advice.