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Rw Factor

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In UBC Table 16-N, the only critera provided for allowing a Rw=8 (Type 1a) vs.
a Rw=6 (Type 1b) is " wood structural panel walls (plywood) for structures 3
stories or less".   Is there other critera available?    It seems that both
vertical and horizontial plan irregularities should also be considered when
using Rw=8.