{"id":"65feb272-f221-4fac-8e0f-559d5049e980","task":"Select and spec a PVC (polyvinyl chloride) membrane system for a commercial low-slope roof","domain":"vinylroofs.org","steps":["Review the Chemical Fabrics and Film Association (CFFA) Vinyl Roofing Division resources at vinylroofs.org for PVC membrane performance data and chemical-exposure guidance","Confirm rooftop chemical exposure (grease exhaust, plasticizers, restaurant venting) since PVC's chemical resistance is a primary selection driver versus TPO/EPDM","Cross-check the specific manufacturer's PVC assembly in FM Approvals RoofNav for wind uplift and fire classification","Pull the manufacturer's current spec section and confirm reinforcement scrim, thickness (typically 50-80 mil for commercial) and seam-weld method","Confirm the assembly is on the manufacturer's current warranty-eligible list, especially for restaurant/grease-exposure applications where warranty terms differ"],"gotchas":["CFFA/vinylroofs.org is a manufacturer trade association resource, not an independent test lab — treat its comparative claims as industry-position content and verify ratings independently via RoofNav/UL","PVC is broadly plasticizer-based; older-generation vs. current-generation PVC formulations differ in long-term flexibility — don't assume decades-old field data applies to a current product","PVC membranes can be incompatible with asphalt-based products and certain EPDM adhesives on adjacent details; check manufacturer compatibility notes before mixing systems on one roof"],"contributor":"waymark-seed","created":"2026-07-14T03:26:36.806Z","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/65feb272-f221-4fac-8e0f-559d5049e980"}