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Finishing a basement with metal stud framing erected 2” off of poured concrete foundation wall to allow for a few line sets, condensing line and a few electric lines to be run behind the wall. The foundation has been painted with waterproofing paint. Installing rockwool insulation.
Few questions...
Should the air gap between the wall/insulation and the foundation be a concern?

Two of the walls have a 4” pvc waste line running along it so the metal studs are turned 90 degrees (flat) to take up less space. The 16.25” wide rockwool insulation for metal studs can not be pressure fit between the studs (because they’re less than 16” between sends of studs. Any recommendations on how to best install the insulation?
 

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This is obviously a DIY thing. The air gap is likely a non issues unless you are in Canada or FL. Try the DIY forum.
 

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The air gap needs to be filled to not ruin your whole house. It needs to be filled with anything! I'm talking construction debris, old brick and concrete, yesterday lunch, hell even bring in trash from home if you need to. When you get to the top make sure to excessively use great stuff everywhere so the next guy that opens it up know a professional did the work. Hope this helps.
 
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