Viper composite limiting heights are based on testing in accordance with ICC-ES acceptance criteria AC86-2019.
No screws are required between stud and track, except as required by ASTM C754.
Viper composite limiting heights based on a single layer of 5/8” type X gypsum board applied vertically to both sides of the wall over full height. 5/8” Type X wallboard from the following manufacturers are acceptable: USG, National, Georgia Pacific, CertainTeed, American, Continental, and PABCO.
Mechanically fastening the gypsum panel to stud & track is required. For deflection track usage contact Technical Services.
See CCR-0154 for additional information. Also review fire related assemblies for any additional requirements.
Non-Composite Limiting Heights Notes:
Limiting heights are in accordance with AISI S100-07 using all steel non-composite design.
Limiting heights are established by considering flexure, shear, web crippling and deflection.
Fully Braced Table: For bending, studs are assumed to be adequately braced to develop full allowable moment. Studs are considered fully braced when unbraced length is less than Lu. See section properties table in the ViperStud catalog for Lu values. 48” O.C. Braced Table: Lateral-Torsional buckling moments are based on section C18.104.22.168 of AISI S100-07, with max discrete bracing of 48” o.c.
For web crippling, when h/t ≤ 200, the web crippling values are computed based on section C3.4.2 of AISI S100-07, when h/t >200, the web crippling values are based on testing with a bearing length of 1”.
No web stiffeners are required for studs with h/t > 200, web crippling and shear values have been confirmed by testing.
The factory punchouts are in accordance with section C5 of AISI S201-07. The distance from the center of last punchout to the end of the stud is 12”.