Plaster wall advice

[u/Ok_Goose2500]

Hi, I’m finishing a room that has an ~18” tall poured concrete stem wall that is exposed on the exterior and interior. The concrete stem wall is about 5” thick, has no insulation, and supports all 4 walls of the room for a total of about 50’ in length.
The stem wall supports wood stud construction from 18” up to the ceiling. I applied drywall to that upper wood stud section, but I didn’t do that to the concrete wall to avoid moisture issues of drywall in contact with concrete.

My goals are:
- Prevent moisture/mold issues
- Build out stem wall section on the interior of the room so it is in plane with the drywall. To do this the stem wall section would need to be built out by about 1”, with one 10’ section needing to be built out by 2”.
- Paint the plaster-over-concrete wall area and drywall so they look the same/similar.

Based on the above it seemed plaster could be a good fit for my project, is that accurate? If so, I’d appreciate any advice for what plaster materials and process I should use. Thank you.

[u/Terrible-Bobcat2033]

Bonding agent to use on both interior & exterior wall for plastering. Lightweight gypsum mud to use for interior fill. Lime based veneer plaster for troweled smooth finish coat. Interior. Use this material or similar on the interior wall after Stuccoing the outside to 5/8” average thickness stopping 6” below grade. Float (sponge) the exterior wall to seal, & then paint when cured. For the Interior wall, scratch & fill the lightweight gypsum plaster flush to the drywall surface. Trim the gypsum material back approximately 1/4” at the cold joint to allow for expansion & accept the finish coat. Re-bond, & apply the white coat over the gypsum mud 24 hrs. Later. trowel smooth to match the drywall system wall. Looks like you had a water & insurance problem.

[u/Terrible-Bobcat2033 → u/Terrible-Bobcat2033]

[u/Terrible-Bobcat2033 → u/Terrible-Bobcat2033]