What does everyone use as the minimum deflection limit for parapets? Footnote i in Table 1604.3 of the IBC allows cantilever members to have twice the deflection of the wall. In an application where the wall deflection limit is L/180, that would allow a parapet deflection of L/90. Does that seem a bit excessive assuming it isn't affected by other factors such as siding, stucco, etc.
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