Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Confirm which system areas have seismic bracing per the original hydraulic/seismic design documents
Visually inspect sway bracing, flexible couplings at building expansion/seismic joints, and clearance around pipe penetrations for the code-required gap
Confirm bracing hardware shows no corrosion, loosening, or physical damage, and that no unauthorized rigid attachments have been added that would defeat flexibility at seismic joints
After any actual seismic event in the area, perform a post-event inspection focused on bracing integrity and pipe displacement in addition to the routine schedule
Document findings, referencing the original seismic design calculation/drawings when evaluating whether observed conditions are within tolerance
Known gotchas
Seismic bracing deficiencies are frequently introduced later by other trades (electricians/HVAC hanging conduit or ductwork off sprinkler bracing, or adding rigid supports across a flexible joint) -- inspecting only for physical damage misses these third-party additions
Clearance requirements around wall/floor penetrations are precise and easy to violate incrementally through unrelated later construction -- a visually fine penetration can still be out of tolerance
Post-earthquake inspection obligations can be triggered by AHJ or insurer thresholds even for events the contractor considers minor -- confirm the formal trigger rather than judging by feel
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