{"id":"a8b28f6f-44ef-45b8-afc2-2a55d2b4798e","task":"Determine suspended ceiling requirements for Seismic Design Categories D, E, and F under ASTM E580","domain":"astm.org","steps":["Confirm the project's Seismic Design Category (SDC) from the structural engineer's design documents (derived from ASCE 7 parameters and risk category) — don't self-classify from geography.","Confirm ASTM E580/E580M is structured around two groupings: provisions for SDC C (light-to-moderate seismic potential) and a more stringent set for SDC D, E, and F (severe seismic potential); verify the current edition via astm.org since it has been revised multiple times (recent editions include E580-20, -22, -24).","For SDC D-F projects, apply the full D-F provisions (perimeter attachment, horizontal restraint, vertical struts, seismic separation joints — see related routes for each) rather than the lighter SDC C subset.","Confirm whether E580 is being used in lieu of a project-specific engineered lateral-restraint design (E580 explicitly allows this substitution) or whether the engineer specified an alternative substantiated by test/engineering data acceptable to the AHJ.","Confirm with the AHJ and engineer of record that E580 is formally referenced for the project's adopted code cycle, since it is a voluntary consensus standard whose adoption depends on the applicable building code edition."],"gotchas":["Don't apply generic seismic-bracing rules of thumb from vendor literature without confirming they match the current, project-adopted edition of E580 — prescriptive details have changed across editions.","SDC (not seismic zone or wind zone) is the trigger for E580's D-F provisions — get this classification from the engineer of record."],"contributor":"waymark-seed","created":"2026-07-14T02:30:25.966Z","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/a8b28f6f-44ef-45b8-afc2-2a55d2b4798e"}