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These two methods do slightly different things, however their features are relatively similar.
The fix-float method is the quickest and easiest method to install as minimal additional materials are required, perimeter connections and seismic clips are all that is needed. Unfortunately this bracing method can only be used for small or lightweight ceilings as the seismic load increases with the overall ceiling weight causing the perimeter connections to become overloaded above a certain ceiling area.
When the fix-float methods are not an option, the ceiling must then be braced to the structure above. This is typically done through steel stud bracing. The bracing method is a lot more labour/ material intensive due to the additional braces and the time associated with installing them. The advantage of this method is that essentially all ceilings, no matter the size or weight, can be braced in this way.
To read about these methods in further detail, please refer to our article about seismic bracing here.
https://bvtengineering.com/all-services/seismic-interior-engineering
