Slab foundation home, recently renovated interior (walls to studs, interior plumbing upgraded, nothing below slab touched). After renovation we also redid our exterior pavers — the old concrete patio used to sit flush against the base of the exterior walls. Now that the grade is lower, the weep screed zone and wall base are visible for what I think is the first time in decades. (60s house). I should probably note grading issues / water pooling prompted our paver project.
Anyway, one exterior wall has a corroded cast iron sewage cleanout with what looks like rotted wood (mudsill?) visible behind the stucco. On the opposite side, the weep screed flashing appears to be completely absent over a section, with crumbling deteriorated material visible at the wall base.
My confusion is around what’s actually causing what. Is the deterioration at the wall base a stucco/flashing failure that let moisture in over the years? Is the corrosion on the cleanouts causing chronic wetness at the wall base from the outside? Or is this just what a 50-year-old slab house looks like when you finally expose the base of the walls?
Looking for advice on whether this is one problem with multiple symptoms, or separate problems that need separate specialists? And what’s the correct sequence — plumber first, stucco contractor, structural pest inspector? I don’t want to pay four people to tell me the same thing or fix things in the wrong order.