Video Resource: How to Build a Shaftwall in Commercial Construction

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Jul 22, 2024

Cavity shaftwall systems are unique fire-rated assemblies that are vital for life safety in multi-story buildings – protecting the means of egress for occupants.

Commonly used in elevator shafts, stairwells and mechanical shafts, these assemblies are non-load bearing with fire ratings of one to four-hours. They can also be used as fire-rated, interior partitions where access is restricted to one side and as fire-rated horizontal membranes.

Watch this video from National Gypsum’s 1-800-NATIONAL® Construction Services team to learn the basics of building a shaftwall system, including details for corners, duct and elevator door openings.



Basic shaftwall installation steps:

1. Attach J-tracks with fasteners 24” o.c. at the top, bottom and vertical ends of the wall with the long leg toward the shaft side of the enclosure.


2. Frame all duct openings with J-track to protect cut gypsum core edges and to provide resistance to bending and other stresses.


3. Cut shaftliner 1” shorter than the total height of the wall and fasten to the vertical J-track.


4. Install a stud in the floor and ceiling tracks and friction fit over the long edge of the shaftliner. Alternate installation of shaftliner panels and studs until the end of the wall.


5. Install the face layer of ⅝” Type X gypsum board — one layer for 1-hour UL fire-rated assemblies and two layers for 2-hour UL fire-rated assemblies.


6. Stagger vertical and horizontal joints.

For more information on shaftwall components and installation, refer to the NGC Construction Guide or find product specifications and resources at goldbondbuilding.com.

For architects and specifiers, a regional construction design manager is available through every phase of your project. From expertise on products in fire- and sound-rated assemblies to education on building requirements, we have a representative available to provide design assistance every step of the way. Connect now at the National Gypsum Expert Connection.

@NationalGypsum #NationalGypsum #construct

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