{"id":"d04a6f81-1617-488e-97ed-7e7c605c5577","task":"Plan protection layers and leak-location methods for green roof / plaza deck waterproofing","domain":"waterproofing","steps":["Confirm the assembly's layer sequence against the membrane manufacturer's approved detail (typically membrane → protection course/board → drainage layer → filter fabric → growing medium or wearing course) rather than a generic layering detail.","Flood test the bare membrane per ASTM D5957 before any protection or growing-medium layers are placed, since this is the last point it's fully accessible and repairable.","For post-installation or suspected-leak scenarios where the assembly is already covered, use electronic leak detection per ASTM D7877 (Standard Guide for Electronic Methods for Detecting and Locating Leaks in Waterproof Membranes), which describes a low-voltage method (conductive water path to a breach) and a high-voltage arc method — confirm which method suits the specific membrane conductivity and covering condition.","Recognize D7877's own stated limitation: it's meant to supplement, not replace, visual or infrared inspection — plan to combine methods rather than rely on electronic scanning alone.","Calibrate leak-detection equipment per the manufacturer's procedure and verify sensitivity before and during a survey."],"gotchas":["Electronic leak detection generally requires a conductive path (commonly a water layer or a conductive layer built into the assembly) — confirm compatibility with the actual built assembly before promising a post-occupancy survey will work.","Root intrusion and growing medium can mask surface symptoms on vegetated roofs — the electronic method's value is locating a breach without removing growing medium, so don't skip it in favor of visual inspection alone on planted assemblies."],"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/d04a6f81-1617-488e-97ed-7e7c605c5577"}