Diagnose whether failure is at the lath/key connection (structural) vs. surface deterioration (cosmetic) before selecting a repair method
For failed keys/lath, follow the brief's method of accessing from above (removing floorboards) and injecting elastic acrylic or epoxy adhesive to reattach plaster to lath and lath to joists
Avoid full removal/recasting unless the ornamental element is beyond structural repair, consistent with preservation-first philosophy
Loop in a plaster conservator or SHPO reviewer for tax-credit or landmark-designated projects before any irreversible removal
Known gotchas
Free public NPS guidance, but not a fabrication how-to for reproducing lost ornamental elements -- for full recasting/moldmaking, contractors need supplemental guidance beyond this brief
Injection/reattachment techniques described are for stabilization; they don't address heavy structural overloading (e.g., water-saturated plaster) which may still require full removal regardless of preservation intent
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