{"id":"536cb785-b51f-4184-bcfc-472b68c160c9","task":"Determine code equivalence between drywall grid ceiling systems and standard acoustical tee grid","domain":"iccsafe.org","steps":["Recognize gypsum-board ('drywall') ceilings hung on a concealed grid are a distinct product category from acoustical tile/lay-in tee grid covered by ASTM C636 — drywall grid systems achieve code recognition primarily through an ICC-ES Evaluation Service Report (ESR), not C636 alone.","Confirm the specific ESR number referenced for the drywall grid product in hand, and check its current validity/renewal date directly on icc-es.org rather than relying on a possibly outdated cached PDF.","Verify the main-tee/cross-tee structural classification (e.g., 'heavy duty' load classification per ASTM C635) and base-metal specification (commonly cold-formed steel with a specified hot-dip galvanized coating designation) match what the ESR actually lists as tested.","For fire-resistance-rated drywall-grid assemblies, confirm the specific rating claimed is listed in the ESR's assembly table, and that field gypsum-board attachment (screw pattern) follows the applicable IBC chapter referenced by the report.","Don't assume an ESR issued for one manufacturer's drywall grid product applies to a different manufacturer's system, even if visually similar."],"gotchas":["An ICC-ES report has an expiration/renewal date — using an expired ESR on a permit submittal can trigger a plan-review rejection; verify current status on icc-es.org.","Drywall grid and acoustical tee grid are governed by different reference documents (ESR vs. ASTM C636/E580) — don't cite one standard for the other's product 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/536cb785-b51f-4184-bcfc-472b68c160c9"}