I have torn down an interior wall made of lightweight concrete at home and plan to rebuild part of the wall with studs and plasterboard. The lightweight concrete was built in a recess in the base plate (see image) and I think I should fill in the recess before installing the studs. Am I thinking correctly? And which product should I use for filling? It should be able to hold up to drilling to attach the sill later.

There are two water pipes running to a radiator through the future wall, should I stabilize these in some way? Any tips on how to do that?
 
  • A concrete recessed floor section with exposed pipes and bare walls, showing removed lightweight concrete for renovation plans.
  • Concrete floor corner with a cut-out section near a wall, showing two white water pipes extending from the concrete, next to wooden flooring.
  • View of a partially demolished interior wall with pipes leading to a radiator, showing an indented concrete base that needs filling before reconstruction.
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Fill in with regular fine concrete (those bags with "all in one") that you just mix with water should work.

The first rule against the wall, I would screw into the wall with plugs and screws and pull it down behind the pipes. Then you can attach a couple of pipe clamps to secure them and the panel material will go around them as well.
 
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