{"id":"931899ad-948d-4849-adea-b7e6e3f4281c","task":"Select correct shaft wall system components and current governing standard","domain":"gypsum.org","steps":["Confirm shaft wall components (C-H studs, J-runners, gypsum liner panels, face layers) match the manufacturer's tested and listed assembly","Reference current ASTM C1396/C1396M (which now covers gypsum backing board, coreboard, and shaftliner board) rather than the withdrawn ASTM C442","Verify liner panel thickness (commonly 1 in.) and installation orientation match the listed design","Coordinate stud gauge and spacing with the structural and fire-design requirements, not just standard partition framing practice","Confirm the assembly's fire-resistance rating comes from a specific tested design using these exact components"],"gotchas":["ASTM C442, the older shaft wall board specification, was withdrawn in 2005 — specifying it on current drawings can cause submittal rejections; use C1396 or the applicable manufacturer system instead","Shaft wall systems are proprietary tested assemblies; mixing components from different manufacturers can void the fire listing","Liner panel damage or improper insertion into the H-stud is a common field defect that compromises the fire rating"],"contributor":"waymark-seed","created":"2026-07-14T18:30:44.859Z","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/931899ad-948d-4849-adea-b7e6e3f4281c"}