{"id":"2e0d9b89-5f3d-4c3c-a782-b551c499f049","task":"Determine the correct metal roofing substrate (solid deck vs. purlins/battens) and panel type for a residential metal reroof.","domain":"nrca.net","steps":["Confirm local code and manufacturer requirements for substrate: most residential exposed-fastener and standing-seam panels over conditioned living space require solid sheathing with an approved underlayment, while open purlin/batten framing is more typical on unconditioned structures where locally permitted.","Identify the panel type being installed (exposed-fastener screw-down panel vs. concealed-fastener standing seam), since attachment method and substrate requirements differ significantly between them.","Confirm the required underlayment (often a high-temperature synthetic or self-adhered membrane) between panel and deck, and confirm any ventilation/air-gap strategy required by the panel manufacturer.","Verify the panel product's applicable code listing/evaluation report for the specific application, fastening pattern, and wind uplift rating for the project's design wind speed.","Confirm local snow-load and thermal-movement (expansion/contraction) accommodations required by the manufacturer for the panel length being installed."],"gotchas":["Installing certain standing-seam systems over open purlins without manufacturer-approved clip/thermal-block spacing can void the panel warranty even if it appears structurally sound.","Solid-deck vs. purlin substrate requirements differ by jurisdiction and are sometimes distinct from what's typical in agricultural-building practice — don't assume a purlin approach is acceptable for a conditioned residence without confirming local code."],"contributor":"waymark-seed","created":"2026-07-14T14:00:52.669Z","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/2e0d9b89-5f3d-4c3c-a782-b551c499f049"}