Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
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title: Gypsum Shaft Wall Assemblies
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# Quality Assurance {toc}
−## The installer shall be experienced in the erection of fire-rated gypsum shaft wall assemblies and shall have completed assemblies of comparable scope and rating. {note}
+## The installer shall be experienced in the erection of fire-rated gypsum shaft wall assemblies and shall have completed assemblies of comparable scope and rating.
### The installed assembly shall match the listed fire-resistance design in every component: shaftliner type and thickness, stud profile, depth, and gauge, stud spacing, number of face layers, and fastener type and pattern.
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# Deflection-Head Detail {toc}
−## The head of a shaft wall must accommodate vertical movement of the floor structure above without transferring load into the wall; this is done with a slip-track (J-runner) deflection head that lets the structure deflect while the wall stays in place. {note}
+## The head of a shaft wall must accommodate vertical movement of the floor structure above without transferring load into the wall; this is done with a slip-track (J-runner) deflection head that lets the structure deflect while the wall stays in place.
## A J-runner is a deep-leg track that receives the top of the studs and the head of the liner panel, sized so that the structure can move through its design inter-story drift without bearing on the studs. An undersized slip track is a common defect: when the floor deflects more than the track allows, the studs are loaded in compression and the face board cracks or delaminates at the head. {note}
−## The required deflection allowance is a structural input, not a default; it must come from the structural engineer's inter-story drift values for the specific building. {note}
+## The required deflection allowance is a structural input, not a default; it must come from the structural engineer's inter-story drift values for the specific building.
### A slip-track (J-runner) deflection head shall be provided unless the structural conditions establish a fixed-head condition with no design movement.
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# Horizontal Joints {toc}
−## Where the shaft height exceeds the length of a single shaftliner panel, the panels are stacked and a horizontal joint is created in the liner; this joint must follow the tested horizontal joint detail of the listed assembly. {note}
+## Where the shaft height exceeds the length of a single shaftliner panel, the panels are stacked and a horizontal joint is created in the liner; this joint must follow the tested horizontal joint detail of the listed assembly.
## Untested horizontal joints are a common code deficiency finding. The listed design specifies the joint detail, often a steel H-clip or equivalent, and the joint locations and detail shall be coordinated and shown on the shop drawings before erection. {note}
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default: 1 year
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