{"id":"2a2d921e-2236-4352-b626-e693164b613e","task":"Address elevator pit waterproofing requirements and common failure points","domain":"waterproofing","steps":["Confirm the elevator has Firefighters' Emergency Operation (most passenger elevators do); ASME A17.1 §2.2.2.5 then requires the pit to have a drain or sump pump sized to a stated minimum capacity (commonly cited around 3,000 gallons per hour / 50 gpm per car) — verify against the current A17.1/CSA B44 edition adopted by the jurisdiction.","Discharge the pit drain/sump through an indirect waste connection into the sanitary or storm drainage system per the applicable plumbing code — the indirect (air-gap) connection prevents sewage/storm surcharge from backing into the hoistway.","Waterproof the pit itself per the applicable building code's below-grade trigger (e.g., IBC §1805.3) whenever the pit floor is below the water table or subject to hydrostatic pressure, so the sump pump isn't the sole line of defense.","Include a positive means (trap seal, gasketed cover, or check-valve arrangement per the plumbing code) to keep sewer gases/water from entering the hoistway through the drain.","Confirm whether the local elevator safety program (some states publish technical bulletins) mandates a specific periodic sump-pump function test beyond the base A17.1 text."],"gotchas":["A sump pump is not a substitute for pit waterproofing — code frames the pump as handling incidental/emergency water, not as the primary defense against chronic hydrostatic groundwater that wall/floor waterproofing should be handling.","An unprotected floor drain (no trap seal or backwater protection) tied to a sanitary line is a common code violation flagged in elevator inspections — verify the indirect connection and gas/water protection, not just that a drain exists."],"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":"sampled","url":"https://mcp.waymark.network/r/2a2d921e-2236-4352-b626-e693164b613e"}