{"version":"1.0","type":"card","id":"9331b200-2044-4deb-95a6-600ab77cd194","url":"https://stacklist.com/card/9331b200-2044-4deb-95a6-600ab77cd194","title":"Understanding Floor-Ceiling Assemblies and Fire Ratings","source_url":null,"note":"Gypsum underlayment is not fireproof, but it is non-combustible and fire-resistant, and part of fire-rated floor-ceiling assemblies.","image":{"url":"https://ucarecdn.com/a09feb36-3c32-44d8-ab7a-3ac7dfc5cc2d/","alt":"Understanding Floor-Ceiling Assemblies and Fire Ratings","width":1024,"height":512},"stack":{"id":"d2ee3c27-eae3-4a1e-aee2-633850a041f1","title":"Recent News from Formulated Materials","url":"https://stacklist.com/stack/d2ee3c27-eae3-4a1e-aee2-633850a041f1"},"created_at":"2026-10-09T14:37:50.739Z","updated_at":null,"published_at":"2026-10-09T14:42:47.154Z","aco":{"summary":"Fire-resistance ratings come from complete floor-ceiling assemblies, not individual materials like gypsum underlayment. Treadstone gypsum underlayment appears in over 110 UL designs and contributes to verified fire-resistance ratings when used as part of a tested system.","tags":["gypsum-underlayment","fire-ratings","floor-ceiling-assemblies","ul-design","fire-resistance","construction-materials","building-codes"],"key_entities":[{"name":"Treadstone","type":"technology","confidence":0.95},{"name":"gypsum underlayment","type":"technology","confidence":0.92},{"name":"UL","type":"organization","confidence":0.9},{"name":"fire-resistance rating","type":"concept","confidence":0.93},{"name":"floor-ceiling assembly","type":"concept","confidence":0.91},{"name":"FR25","type":"concept","confidence":0.85},{"name":"FR30","type":"concept","confidence":0.85}],"classification":"reference","language":"en","confidence":0.85,"provenance":{"model":"claude-haiku-4-5","tool":"@stacklist/be@0.1.0","confidence":0.85,"timestamp":"2026-10-21T20:08:12.244Z"},"token_counts":{"approximate":468,"cl100k":402},"content_hash":"sha256:cd0f072164a8c7e662173cd147764487806f45d7e6692125099c937df250ef32","acp_version":"0.2","body_available":true,"body_tokens":468,"visibility":"public","agent_accessible":true,"status":"final"},"_links":{"self":"/api/public/card/9331b200-2044-4deb-95a6-600ab77cd194.json","html":"https://stacklist.com/card/9331b200-2044-4deb-95a6-600ab77cd194","md":"/api/public/card/9331b200-2044-4deb-95a6-600ab77cd194.md","stack_json":"/api/public/stack/d2ee3c27-eae3-4a1e-aee2-633850a041f1.json"}}