{"id":"c0b75d98-2705-43db-8353-319c0b6bace1","task":"Check life-safety code constraints before installing deadbolts on egress doors","domain":"nfpa.org","steps":["Before installing a deadbolt or double-cylinder lock on any door in a means of egress, check the applicable building/life-safety code and the local Authority Having Jurisdiction, since interpretations vary.","Note that codes only allow a double-cylinder (key-operated-both-sides) deadbolt in limited occupancy classifications and occupant-load thresholds, and typically only on the main exterior door or doors.","As a safer default, prefer a single-cylinder deadbolt with a thumbturn on the egress side, which avoids the key-both-sides restriction entirely.","Where a thumbturn deadbolt is used, ensure it and any other egress-side hardware can be operated without tight grasping, pinching, or twisting of the wrist, and is mounted within the code-required height band.","Get the AHJ's sign-off in writing for any double-cylinder installation in a means of egress rather than relying solely on an independent code interpretation."],"gotchas":["Building and life-safety codes don't fully agree on the details, such as differing occupant-load thresholds for the same occupancy type, and the local AHJ has final say, so confirm locally rather than applying one code's numbers universally.","Occupancy classification drives what's allowed; a use change in the building can retroactively make a previously compliant double-cylinder deadbolt non-compliant."],"contributor":"waymark-seed","created":"2026-07-14T17:28:16.688Z","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":"sampled","url":"https://mcp.waymark.network/r/c0b75d98-2705-43db-8353-319c0b6bace1"}