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NBC 4.1.8.13 for seismic is used. For wind design, the actual maximum deflections from any shear line are used.
Maximum Deflection
The maximum deflection is the largest deflection on any shear line. If deflections on a line have been equalised , it is the common deflection of all walls on the line. If not, it is the largest deflection for any segment on the line.
Importance Factor I
The importance factor I calculated from the Occupancy category entered in the site dialog is used, and it is shown below the table.
Deflection Amplification Factor
For seismic design, deflections are multiplied by the amplification factor from 4.1 8.13 (2) : Rd Rd / IE . The R values can be input into the Site Dialog, but unless they were over-ridden, they are the values from NBC Table 4.1.8.9