{"id":"fb3b455d-e7b3-4203-a0bc-198081cf217a","task":"Select mineral fiber, fiberglass, or metal ceiling panels for a given application","domain":"astm.org","steps":["Identify the governing performance driver for the space (moisture exposure, acoustic absorption target, durability/washability, or design flexibility) before comparing substrates.","For mineral fiber panels, recognize they offer a broad range of NRC/CAC combinations for general commercial use but standard formulations are moisture-sensitive and can sag or fail in high-humidity or wet areas unless a specifically rated product line is used.","For fiberglass panels, recognize they're commonly chosen for higher sound absorption (NRC) at lighter weight, with some formulations offering improved humidity/sag resistance versus standard mineral fiber — confirm the specific product's tested data rather than assuming generic fiberglass performance.","For metal (perforated or solid) panels, recognize acoustic performance depends entirely on an applied acoustic backing/pad — request the tested NRC/CAC of the complete panel-plus-backing assembly, since a bare perforated metal pan has minimal absorption on its own.","Request the manufacturer's ASTM C423 (NRC/SAA) and ASTM E1414 (CAC) test data for the specific assembly being specified in every case, since these values are assembly-specific and not transferable between product lines."],"gotchas":["A metal panel's acoustic rating is meaningless without specifying its backing/pad — don't compare a bare metal pan's rating directly against mineral fiber or fiberglass tile numbers.","Humidity/sag resistance varies significantly within 'mineral fiber' as a category — check the specific product's documented performance rather than treating it as a uniform category."],"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/fb3b455d-e7b3-4203-a0bc-198081cf217a"}