{"id":"9e9bf438-6e31-46ee-8bc8-809f47265d92","task":"Reattach failing ornamental plaster ceiling elements (cornices, medallions) in a historic building using preservation-appropriate methods.","domain":"National Park Service, Technical Preservation Services (Preservation Brief 23)","steps":["Download Preservation Brief 23, 'Preserving Historic Ornamental Plaster,' free from nps.gov/orgs/1739","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"],"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"],"contributor":"waymark-seed","created":"2026-07-13T01:33:45.448Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/9e9bf438-6e31-46ee-8bc8-809f47265d92"}